bing tracking image
  1. Battery Charger
  2. Redarc
  3. RV/Camper
  4. Trailer
  5. Battery Charger
  6. 12V
Redarc In-Vehicle BCDC Battery Charger - Dual Input - DC to DC - 12V/24V - 50 Amp

Redarc In-Vehicle BCDC Battery Charger - Dual Input - DC to DC - 12V/24V - 50 Amp

Retail:$618.20
Our Price: $562.00
You Save: $56.20
Battery Charger
This item qualifies for Free Shipping
Shipping Weight: 3 lbs
Quantity: 
In Stock
Redarc Battery Charger - 331-BCDC1250D
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Need help with installation?
Locate installers near me
Maintain the charge on your RV's battery with this dual-input, DC-to-DC smart charger. Unit installs in your vehicle or trailer and pulls power from your solar panels before tapping into the vehicle battery. Great for boondocking and dry camping. 1-833-496-1390 to order Redarc battery charger part number 331-BCDC1250D or order online at etrailer.com. Free expert support on all Redarc products. Great prices and Fastest Shipping for Redarc In-Vehicle BCDC Battery Charger - Dual Input - DC to DC - 12V/24V - 50 Amp. Battery Charger reviews from real customers.
  • All Info
  • Reviews (82)
  • Q & A (0)
  • Photos
  • Why etrailer?

Redarc Battery Charger

  • RV/Camper
  • Trailer
  • Battery Charger
  • 12V
  • Redarc
  • Solar Panels to Auxiliary Battery
  • Vehicle Battery to Auxiliary Battery
  • 200 Ah
  • Charges/Maintains

Maintain the charge on your RV's battery with this dual-input, DC-to-DC smart charger. Unit installs in your vehicle or trailer and pulls power from your solar panels before tapping into the vehicle battery. Great for boondocking and dry camping.


Features:

  • DC-to-DC battery charger draws power from your vehicle to provide power to an auxiliary battery on your trailer or RV
    • Ideal for battery banks rated greater than 200 amp-hours
  • Dual-input device can pull power from 2 sources
    • Connect yellow wire to solar panels (sold separately)
    • Connect red wire to 12V or 24V start battery
  • Multi-stage charging algorithm ensures a complete charge on secondary battery without overcharging
    • Boost stage - provides a constant charge while monitoring auxiliary battery voltage
    • Absorption stage - keeps voltage stable to avoid overcharging while bringing battery up to 100-percent charge
    • Float stage - maintains charge on auxiliary battery
  • Solar power capable - solar panels sold separately
    • Charger automatically draws power from panels before tapping into vehicle battery
    • Built-in MPPT regulator ensures most efficient power transfer possible in all conditions
  • Fully sealed construction with fan-free operation ensures durable performance under harsh conditions
    • Tested to ensure operation in temperatures as high as 176 F
    • Protects sensitive electronics from water, dust, and shock
  • Fault recognition technology prevents damage to batteries from voltage spikes, overheating, and reverse polarity connection
  • Battery isolator function prevents charger from pulling power from start battery when vehicle is off
  • Multiple mounting options for convenient installation
    • Secure the unit in the cabin of the vehicle, along a chassis frame rail, in the engine compartment, or on your trailer
    • Cables, fuses (331-FK40 - sold separately), and connectors sold separately
  • Made in Australia


Specs:

  • Application: 12V or 24V vehicle systems with standard or smart alternators
    • Battery types supported: AGM, gel, standard lead acid, calcium, and Lithium ion (LiFePO4) batteries
  • Overall dimensions: 6-1/2" long x 4-3/4" wide x 1-1/2" tall
  • Battery capacity range: greater than 200 amp-hours
  • Maximum charging voltage: 15.3V
  • Output voltage: 12V DC
  • Output power: 750 watts
  • Output current rating (continuous): 50 amps
  • Input current (maximum): 50 amps
  • 2-Year warranty


The Redarc BCDC dual-input battery charger allows for easy charging of a DC battery while you're on the move. Most battery chargers require that you plug into an AC outlet, but this DC-to-DC charger pulls power from your vehicle's start battery instead. The BCDC also has solar power capability so that you can keep your secondary battery charged while you're parked at a remote campsite. This means that you can go off the grid without worrying about being without power.


This charger connects directly to your battery, rather than pulling power from your vehicle via the trailer connector. This is to ensure that it's able to fully charge your auxiliary battery. A standard 7-way trailer connector is limited to 10 or 15 amps of current, which will not be able to fully restore a battery for use. But this charger can transfer up to 50 amps of current to both charge and maintain your auxiliary battery.


Solar Power Compatible with MPPT Regulator

This charger can pull power from 2 different sources. The first input accepts charge from your vehicle's battery. The second input on this dual-input unit is designed to receive power from solar panels (sold separately). The built-in maximum power point tracking (MPPT) regulator on this unit ensures that the charger will get the most power possible from your panels at any given time. An MPPT regulator is able to determine the point at which your solar panels reach their maximum output. Then the regulator can simulate that load on the panels to effectively draw the most power possible. This type of regulator is more effective than traditional ones at gathering power from solar panels and at drawing power in low-light conditions.


Built-in Green Power Priority, or primary solar selection, ensures that power is pulled from your solar panels first. The BCDC will only tap into your vehicle's battery when necessary. This will save your vehicle battery from unneeded stress. It also has a built-in battery isolator function to prevent the charger from pulling power from the start battery when the vehicle is off.


3-Stage Smart Charger

REDARC BCDC Battery Charger LED Indicators

The BCDC battery charger can be used to charge AGM, gel, standard lead acid, calcium, and Lithium ion (LiFePO4) batteries. An LED on the front panel of the unit will illuminate to show the charge profile, confirming that you've wired the charger correctly based on your auxiliary battery type. This LED will be solid while the unit is charging, and it will flash when the unit is in standby mode. Additional LEDs on this panel indicate where the charger is pulling power from, and what stage of the charging process the unit is in.


This smart charger completely and efficiently charges your auxiliary battery in 3 separate stages. This ensures that the battery reaches maximum capacity without being overcharged.


The first stage of the process, the boost stage, begins when you start up your vehicle. In this mode the charger will maintain a constant current to the auxiliary battery to quickly help it regain power.


Once the unit detects that your auxiliary battery is nearing its maximum charge, the charger will move into the absorption stage. In this stage it will slowly supply the needed current to safely reach 100-percent capacity on the auxiliary battery.


The final stage is known as the float stage. In this stage the unit monitors your auxiliary battery for drops in power and supplies the needed current to keep it fully charged. If a drop in power is detected, it will revert back to the first stage and begin the charging cycle over.


Compatible with Smart Alternators

A number of newer vehicles on the market have ECU-controlled, variable-voltage alternators designed to reduce emissions and boost performance. This type of alternator varies its voltage based on the driving conditions. When the alternator voltage is low, the system can drop below 12.7V, which would deactivate a standard isolator or battery charger. However, with the Redarc BCDC battery charger, this is not an issue. Simply connect the blue override wire to the vehicle ignition and the charger will recognize that the car battery is still receiving a charge from the alternator, even if the voltage has dropped. The charger will modify its voltage requirements so that it can continue to pull power until the start battery drops to 12V, as opposed to the standard 13.2V.


Versatile Mounting

This unit can be mounted in a variety of places to best suit your application. Use the 4 mounting tabs to secure the unit in the cabin of your vehicle, along a chassis frame rail, in the engine compartment, or on your trailer. The charger should be mounted as close as possible to the auxiliary battery being charged to prevent current loss. The farther the current has to travel, the more amperage is lost. A larger diameter wire will allow more current to flow through it, which can offset the current loss that occurs with longer lengths of wire. As a result, it is recommended that you use a heavier gauge wire to cover longer distances. The table below outlines the recommended wire size for a given length of cable:


Redarc BCDC Dual Battery Charger Wiring Guide

To ensure a low-resistance connection, you will want to use MIDI fuses (331-FK60 - sold separately) when connecting the BCDC to your batteries.


For a typical lead acid battery setup, refer to the wiring diagram (shown with fuses and optional LED and solar panel - sold separately) below:


Redarc BCDC Dual Battery Charger Standard Lead Battery Wiring Diagram

For a typical Lithium ion (LiFePO4) battery setup, refer to the wiring diagram (shown with fuses and optional LED and solar panel - sold separately) below:


Redarc BCDC Dual Battery Charger Lithium Battery Wiring Diagram



BCDC1250D REDARC In-Vehicle BCDC Battery Charger - Dual Input - DC to DC - 12V/24V - 50 Amp

Item # 331-BCDC1250D

Installation Details 331-BCDC1250D Installation instructions


California residents: click here


Customer Satisfaction Score:


Customer Reviews

Redarc In-Vehicle BCDC Battery Charger - Dual Input - DC to DC - 12V/24V - 50 Amp - 331-BCDC1250D

Average Customer Rating:  4.8 out of 5 stars   (82 Customer Reviews)

Maintain the charge on your RV's battery with this dual-input, DC-to-DC smart charger. Unit installs in your vehicle or trailer and pulls power from your solar panels before tapping into the vehicle battery. Great for boondocking and dry camping.

by:

Watching the etrailer video along with product instructions made install easy and straightforward. We are traveling Alaska and charger is working perfectly. Would highly recommend this dc to dc charger.




by:

I brag about this to other van owners. It gives me more charge from the alternator to my batteries than other brands or products. 40+ amps over about 14 feet of probably six gauge wire from a 130 amp alternator.
Stellar tech support!




by:

A year later no issues at all. Solved many issues wish Id bought it earlier and saved a set of batteries.


Comments
Great. Transferring it to a newer vehicle with 560ah of lifepo4 batteries.
John L - 12/19/2021


by:

Great product, small form factor, solid construction.




by:

Sharon was very helpful!




by:




by:




by:

Great




by:

Review from a similar BCDC in Battery Charger


This unit has worked fine for me. Once wired up I can pretty much forget about it and know that it's charging my house battery whenever I start my vehicle. Probably more important is the automatic disconnection it makes from my starting battery & vehicles charging system when I shut down the vehicle. As well the convenience of adding a solar panel to the system to charge the house battery while the unit still AUTOMATICALLY chooses the best option to charge and disconnects anytime I shut down the vehicle. There are a LOT of different devices/ electronics to accomplish this but the Redarc seems to combine many features/connections in one convenient unit. I have not had the solar portion hooked up yet BUT my understanding is that when I get ready to do so I will NOT need to order a separate MPPT charge controller as that is a built in feature of the unit. These units are a bit pricy for up front cost but seems to provide a lot of features all in one compact unit with a fairly simple wire connection to get it up and charging.


Comments
A year later and Redarc is still working flawlessly! BatteryLifeline brand seems to be maintained in a strong state of charge. So far this seems to be a high quality and proven unit to do what its advertised to do. And if you have any questions, the guys Down Under in Australia are right on the line to happily help you. Thanks Mates for a great product. Goodayh Mate
Dusty - 04/23/2022


by:

Review from a similar BCDC in Battery Charger


I installed this on my 2015 Airstream with my 2020 F-150 and love it! The 96 FR will work with the 7-pin trailer harness and the F-150, so there is no need to run bigger wires. The truck has a 25 amp fuse on the charging circuit to the 7-pin trailer harness, and the 96 FR is current limited to 20 amps, which is perfect! The F-150 has a smart alternator that reduces the output voltage when the truck is under load, so without the 96 FR the truck would do very little charging of the trailer batteries while driving down on the road. I love it!




by:

Review from a similar BCDC in Battery Charger


This unit has performed as expected. My batteries are mounted inside a plywood box in the back of my van. All the connections for the Redarc are inside the box so it has a very clean install on the exterior of the box. The two DC switches in the picture allow me to disconnect the input line to the Redarc from the vehicle's electrical system and the second disconnects my Battle Born batteries from everything. I only shut off the system when I take it into the van dealership for maintenance, and that is only precautionary.


Comments
It still works great. In fact, last week I got the solar connected and it worked without a problem.
Bill A - 07/03/2021


by:

Review from a similar BCDC in Battery Charger


Overall, I think giving the product itself 4 stars is a correct evaluation. I want another evaluation of 5 stars given to the support staff at Redarc. The charger itself has not given me the slightest issue as far as reliability goes. The fact that it came with a temperature sensor in the device that shuts off charging at its own temp of 0°C (freezing temp) on Lithium charging mode came as a complete surprise to me. By reading the documentation that came with the charger, I didn't discover it shuts off automatically at freezing temperature. When I noticed I could not charge my LifePo4 battery at below freezing. Thanks Redarc staff for telling me about this after I asked about it.




by:

Review from a similar BCDC in Battery Charger


Flawless operation. Keeps my 6 volt golf cart batteries charged on my Truck Camper. Charges 2.5 times faster than shore power or Honda generator. I installed in hot engine compartment and it works fine. Highly recommend




by:

Review from a similar BCDC in Battery Charger


I'm charging a house battery that powers a 12 volt refrigerator. Very simple install. Not giving this unit a 5 star rating because the 12 volt input and charging wires exiting the unit are 12 gauge wire and they get fairly warm to the touch. The instructions that come with it list 10 gauge wire as the minimum wire size to use to connect it.


Comments
Still working and Im happy with the job it does.
Rbberfish - 05/28/2022


by:

Review from a similar BCDC in Battery Charger


Great product…works as advertised
Very
rugged construction and you can mount it anywhere
Mounted this into the battery box on my 2021 Airstream
Fabulous customer support from Redarc
Endorsed by Battleborn

Well worth the price




by:

Review from a similar BCDC in Battery Charger


Thanks etrailer for bringing this product to the USA market. I found the REDARC chargt talked about on Australian “caravan” blogs before etrailer had it for sale and considered trying to buy it from an Australian vendor. I use the BCDC1225D to charge my 200 amp hour lithium battery in my truck camper. I have 350 watts of rooftop solar and ran 8gauge wiring from the truck battery through a bed mounted Andersen connector. The very compact size of the unit allowed me to tuck it away in a small space in my camper. I wired it up just as suggested in the instructions and it worked perfectly. I’m getting the full 25 amp charge that the solar panels will provide at midday and get the added benefit of being able to charge at the same rate while driving in the dark. The thing works great. Thanks again etrailer for bringing this product to the USA market


Comments
I’m still loving my Redarc. Five Stars!
Chris J - 08/01/2020


by:

Review from a similar BCDC in Battery Charger


This worked exactly as I hoped. I needed something to limit the current coming out of a cigarette lighter so I could charge a lithium battery from that lighter. Worked perfectly.

eTrailer was helpful in showing me this solution.




by:

Review from a similar BCDC in Battery Charger


Most modern 1/2 ton pickups have "energy efficient alternator" as part of the battery management system. That means if the battery management system senses that your truck battery is fully charged, it lowers the output of the alternator. This means that the alternator voltage is insufficient to charge the camp trailer battery. This Redarc device will take the lower voltage from the alternator and boost it up to charge the camper battery. It works as intended and solved a big mystery for me as to why the camper battery didn't gain charge during long drives from one campground to another




by:

Review from a similar BCDC in Battery Charger


I highly recommend it. Adding a dual battery setup and using the Redarc BCDC1225D to charge it was the best addition to my rig. Very simple to install and etrailer.com customer service is Tier 1.




by:

Review from a similar BCDC in Battery Charger


I installed this in a 2017 Oliver Legacy Elite II travel trailer, because I had installed Battle Born lithium batteries and there was no way my truck was going to charge them properly. The actual installation was fairly painless, but I had to run bigger wires from the front of the trailer back to the batteries, which are located over the axles. I get a solid 10.5 amps continuously now, even though my Land Cruiser is only putting out 13.5 volts when connected. It works as advertised and I do recommend it. I took one star off because I think it is over priced, but that is be expected for an Australian import.




by:

Review from a similar BCDC in Battery Charger


The charger works great. Here is a picture of the system I built for it. The battery is a Battle Born 100 amp hour LiFePo, it’s also charged by (2) 100 watt flexible solar panels. It has (2)- 12 volt receptacles, (2)-dual USB receptacles, and a 750 watt modified sine wave inverter. It runs a small refrigerator, led lights, and various other electronic devices flawlessly. I’m very satisfied with the Redarc unit.




by:

Review from a similar BCDC in Battery Charger


This is a fantastic unit. Very easy to hook to the camper batteries, using both the solar and alternator charging functionality. Used this without any issues on a 14 day trip. The instruction manual is well written and very clear.

No more worries about the state of charge of my batteries even after a long day of driving with the camper because the battery charge level will be greater than 90% when arriving at campsite despite having a refrigerator running in the camper. Will now be able to leave solar panels at home for a short 2 day camping trip.

A few times, the battery level was in the 60%-65% charge level and it was charged back to 80+% within a few hours of driving. Just be aware that getting the lead-acid batteries from 90% to 100% takes a much long time because it has to be a constant low current.

Purchasing from etrailer was an excellent experience - received it in Canada within 2 days or order.




by:

Review from a similar BCDC in Battery Charger


"Great piece of kit!" Seriously well worth the beans. The REDARC allows me to charge my trailer battery while towing. The trailer's converter supplies 13.6 VDC, which is not sufficient to charge my on board battery. The REDARC brings this DC voltage up to approximately 14.7 VDC. So my Truck charging system provides the trailer battery while travelling, and the on board trailer converter,(while AC CONNECTED at the site), sends DC voltage to the REDARC via the Solar Panel Input side of the unit, as I do not have a solar panel. I called Australian support number, and asked if this was an acceptable means of connection. They were most helpful and knowledgeable.


Comments
Two camping seasons and ZERO SNAGS with the REDARC BCDC unit! Real nice
Chas. B - 05/02/2021


by:

Review from a similar BCDC in Battery Charger


The right product for new Ranger with a Four Wheel Camper.Install was easy, compact , maintains two deep cycle agm batteries and monitors 100 amp solar for a complete package. Was able replace my 3 way fridge with a 2 way for better service.




by:

Review from a similar BCDC in Battery Charger


This battery charger is awesome. Delivers 40 amps of power for my lithium batteries while driving. So far, no problems with my 125 amp alternator using this device. Used it on a two month Utah trip.

Would by this again.


Comments
Charger is still working great. No issues whatsoever. would purchase again.
Scott H - 03/04/2022

25
82
Show More Reviews

See what our Experts say about this Redarc Battery Charger

  • Solution For Powering An ARB Fridge While Dry Camping
    I recommend the Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D, the main reason for this is controlled current draw. By using a BCDC, this charge current will be regulated to a specific amount. The current draw from the starting battery would be limited to 55-58amps. The BCDC should be mounted no further than 5 feet from the batteries it is charging. This ensure the output voltage is not effected by voltage drop. Some other steps to consider include changing your battery setup...
    view full answer...
  • Can Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D be Used with Lithium Batteries
    The Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D that you referenced is compatible with Lithium batteries like what you are planning on converting to. This can also accept charge inputs from an alternator and solar panel so it will work well in that regard as well.
    view full answer...
  • Solar Input Voltage Range For Redarc In-Vehicle BCDC Battery Charger
    The Redarc In-Vehicle BCDC Battery Charger - Dual Input part # 331-BCDC1250D is only compatible with unregulated 12V nominal solar panels. You can use 2- 12 volt solar panels in series. The solar input voltage must not exceed 32V. I have attached a snip from the instructions for your reference.
    view full answer...
    Image 1 for
  • Recommended Wire Gauge for Redarc 331-BCDC1250D In-Vehicle BCDC Battery Charger
    It's recommended you place the charger as close to the battery being charged as is possible. According to my contact at Redarc, if the wire length will be 3-16 feet, 6 gauge cable is recommended. If that distance is greater than that, say between 16 and 30 feet, 4 gauge cable is recommended. Per Redarc, if you stay within those guidelines, the voltage drop wouldn't be an issue. I've linked to a product demonstration video featuring the Redarc # 331-BCDC1250D charger.
    view full answer...
    Image 1 for
  • Can Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D Charge 100 AH Battery Bank
    Yes the Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D could charge a bank of 7 100 amp-hour batteries like you have. It would be a matter of wiring up the charger to the battery bank in parallel so that the charger charges all of them.
    view full answer...
  • What Gauge Is Each Wire On The Redarc 331-BCDC1250D Battery Charger?
    The gauges of the wiring harness on the Redarc # 331-BCDC1250D are as follows: The high power wires are 8 gauge – yellow, brown, black, red. Use 6 gauge wire for the high power cable extensions if you are only extending up to 16 feet. However, if you are going to have high power cables ran 16 feet or more, it is recommended to use 4 gauge for the extensions to reduce voltage drop. The referencing wires (no heavy load) are 16 gauge – orange, blue, green. I have attached a demonstration...
    view full answer...
  • Redarc BCDC Charger Compatibility with Magnum Energy Inverter
    The Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D that you referenced would work great with all of the components you mentioned. The 270 amp alternator and the Magum Energy MS2812 Inverter.
    view full answer...
  • Could Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D be Used with Battery Bank
    Yes you can use the Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D to charge battery banks like you have. Since this maximizes the charging it would improve the charging speed.
    view full answer...
  • Is A Charge Controller Needed When Installing The Redarc In-Vehicle BCDC Battery Charger
    You can leave your current solar system as is, your solar panel will get wired directly to the Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D. So, you do not need to utilize the PWM charge controller.
    view full answer...
    Image 1 for
  • Can Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D Run to Trailer Ground
    You can run the ground wire of the Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1250D to your trailer frame without having to bridge any riveted joints. As far as best location for the bolt you'd have to find a location that makes the most sense to your application that's out of the way and would be protected from elements.
    view full answer...
  • Recommended 50 Amp DC to DC Battery Charger for Trailer
    The Redarc In-Vehicle BCDC Battery Charger part # 331-BCDC1250D is what I recommend for a DC to DC battery charger. It uses power from the vehicle battery to charge the trailer battery, providing up to 50 amps. There is built-in safeguards as well so you don't ever wear the main vehicle battery down too far. That said, you might want to upgrade the battery bank on the trailer because the recommended capacity is 200 amp hours for this charger.
    view full answer...
  • How to Determine if 2017 Ford E-450 Has Smart Alternator
    Thank you for all of the information! In order for the alternator on your 2017 Ford E-450 to be a smart alternator there needs to be some type of sensor to read loads; this is typically found on the negative battery terminal. If you check out the attached photo I received from Redarc you can see an example of what that sensor would look like. I'll address your questions in order, but the ultimate answer is that the Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1225D (for standard batteries/smaller...
    view full answer...
    Image 1 for
  • How to Pick Out Redarc DC to DC Battery Charger for 450 Amp Hour Battery Bank
    The only difference between the Redarc # 331-BCDC1240D and # 331-BCDC1250D is the maximum output rating of 40 amps and 50 amps, respectively. Both of these charging units are designed for battery banks above 200 amp-hours. The difference in output means that the 50 amp version will charge your battery from dead to 100% charge faster than the 40 amp version. Overall, I recommend the 50 amp version as it would be able to charge a dead battery faster than the 40 amp version.
    view full answer...
  • Choosing Between The Redarc 25 amp or 40 amp Model For A 2018 RAM Promaster 1500
    Your 180A alternator will work fine with any of their BCDC models. Whether you need a 25, 40 or 50A model will depend on the size of the battery bank you’re planning to charge. If its between 75-200Ah the # 331-BCDC1225D model will be fine but if its greater than 200Ah either the # 331-BCDC1240D or # 331-BCDC1250D will work best to replenish the battery bank faster. Yes, the BCDC can accept unlimited solar Watts/ Amps but its output is limited by the model chosen (i.e. 25, 40 or 50A). Yes,...
    view full answer...
  • Does 12-V Trailer Connector Circuit at 7-way on 2017 Ford F350 Remain Active With Vehicle Running
    Once the trailer is plugged in and the brake pedal is depressed, the 12-volt power circuit on the trailer connector will become active, and can be used for whatever purposes you wish. Keep in mind that this circuit can maintain a trailer battery, but it won't have the available grunt to charge a discharged battery. To fully charge the battery while the tow vehicle is running, you'll need a DC to DC charger like # 331-BCDC1240D for a 40 amp or # 331-BCDC1250D for a 50 amp charger. If you...
    view full answer...
  • Redarc BCDC Battery not Getting Enough Charge from Car Battery to Last More than Two Days
    If you are not getting enough power from your vehicle's battery to charge your Redarc In-Vehicle Battery, part # 331-BCDC1250D, for very long, you can supplement the power going into the RV battery with a solar panel like the Go Power Solar Flex, part # 34272630. We have an extensive selection here that runs the gamut of price and wattage. I've linked to this list for you. Also, be sure to check the manual linked below for the Redarc. Page 12 has a table for cable sizing. If you do not...
    view full answer...
  • How To Choose the Correct Redarc In-Vehicle BCDC Battery Charger for Auxiliary Battery On Vehicle
    In order to choose the correct Redarc In-Vehicle BCDC Battery Charger you'll need to know the amp hour capacity of the battery bank. This would not include the starter battery for the vehicle just the auxiliary battery, the starter battery would get more than enough charge from the vehicle's alternator. Therefore, for a single 12 volt battery you'd need part # 331-BCDC1225D which is rated for 75-200 amp hour batteries (Odyssey PC2150 = 100 Ah). The Redarc In-Vehicle BCDC Battery Charger...
    view full answer...
  • Will the Redarc In-Vehicle Battery Charger Charge the Start Battery While Trailer Is Detached
    I spoke with Redarc about the Redarc In-Vehicle BCDC Battery Charger part # 331-BCDC1250D and they informed me that the unit would not charge the start battery, only the auxiliary battery bank in the trailer. That said, the unit would not let the auxiliary battery bank pull enough power from the start battery in order to create any issues with starting the vehicle so there should be no worries here. If needed, you could also use a small solar panel just to keep the start battery topped...
    view full answer...
  • Will Installing A Cutoff Switch Damage The Redarc BCDC1250 Battery Charger
    I spoke with Redarc and installing a cutoff switch like the # 277-000096 between the Redarc In-Vehicle BCDC Battery Charger - Dual Input - DC to DC - 12V/24V - 50 Amp # 331-BCDC1250D and the auxiliary battery will not damage the unit at all. You will get a low voltage output battery fault, but since you know the cause is the cutoff you can just ignore it.
    view full answer...
    Image 1 for
  • How To Charge Lithium Ion Batteries While Driving and Hooked Up to 110 Volt Power
    In order to charge two lithium-ion batteries while you drive you really only have one option which is to use the vehicle's alternator. In order to pull current from the vehicle's alternator and apply the correct charge profile you need a pretty sophisticated device, the Redarc In-Vehicle BCDC Battery Charger part # 331-BCDC1250D which will make sure you don't undercharge the tow vehicle's battery and overcharge the trailer's batteries or vice versa. Then, in order to charge the batteries...
    view full answer...
  • Solar Panel Open Circuit Voltage For Redarc BCDC Battery Charger
    Based on my research a 12 volt panel doesn’t put out 12 volts but it produces enough voltage to charge a 12 volt battery. It produces around 18 volts and has an open circuit voltage, without a load, of 21 volts. So without a controller, you will only be able to use 1 panel. To use more than one panel you will need a controller like the Furrion MPPT Solar Charge Controller - 50 Amp - 12V and 24V # FSCC60PWBBL which works with panel combinations up to 600 watts.
    view full answer...
  • Charging Lithium House Battery with DC to DC Battery Charger
    There are several ways you can do this, I suggest using a DC to DC battery charger such as the Redarc In-Vehicle battery Charger - Dual Input - DC to DC, # 331-BCDC1250D. If you have or will have solar panels included in your system, even more reason to select this product. Please note attached images and the link to product review video.
    view full answer...
    Image 1 for
  • How To Attach the Redarc In-Vehicle BCDC Battery Charger To the Start Battery
    The Redarc In-Vehicle BCDC Battery Charger part # 331-BCDC1250D needs to be installed on the trailer, next to the service/auxiliary batteries. That said, this now means you must run a wire from the Redarc In-Vehicle BCDC Battery Charger to the start battery in your vehicle. The correct size wire to use will vary based on total length as you mentioned. I recommend you go pretty large so you don't have to worry about issues with length or voltage drop. We actually have a kit that will work...
    view full answer...
  • Installation of the 50 amp Redarc In-Vehicle BCDC Battery Charger
    The 50 amp Redarc In-Vehicle BCDC Battery Charger, # 331-BCDC1250D should be installed in the RV near the battery bank. You will then install a wire from the Redarc Battery Charger, # 331-BCDC1250D to the crank/start battery in your tow vehicle. I recommend you go with a large gauge wire to compensate for voltage drop. We actually have a winch install kit that will work for this purpose, the Bulldog Winch Rear Wiring Kit, # BDW20206. You will also need the 40-Amp MIDI Fuse Kit for Redarc...
    view full answer...


< Previous
12



Do you have a question about this Battery Charger?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate battery charger information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Shane H
Installed by:
Shane H
Employee Zach D
Video Edited:
Zach D
Employee Kristina F
Written by:
Kristina F
Employee Alex H
Updated by:
Alex H
Employee Matthew E
Updated by:
Matthew E
Employee Noah M
Updated by:
Noah M
Employee Jacob H
Video by:
Jacob H

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.


Product Experts Available Now!
Call 1-833-496-1390