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.
If your batteries aren't charging like they should, a new converter charger may be the fix. This deck-mounted unit restores 12V power and automatically adjusts for lead-acid or lithium batteries without major rewiring.
When lights start dimming or batteries stop charging like they used to, it's easy to assume the whole power center needs to be replaced. In many cases, it's really just the converter that's worn out. This deck-mounted converter charger lets you restore clean, reliable DC power without tearing into a distribution panel that's still doing its job. It's a straightforward fix that gets your RV's electrical system back on track.
Yes. WFCO's Auto-Detect technology automatically recognizes lead-acid or lithium batteries and applies the correct profile. Lead-acid batteries receive 3-stage charging with higher voltage during bulk charging, then step down to normal, and trickle/float stages as they recover. Lithium batteries follow a two-stage process designed for faster, more consistent charging. The result is quicker recharge times and less day-to-day strain on your batteries, helping them last longer and perform more reliably.
When you're running a large RV, toy hauler, or long-stay setup, inefficient power conversion can waste energy, strain generators, and create excess heat. This converter uses Power Factor Correction to draw incoming AC power more efficiently, reducing wasted energy while delivering up to 100 amps of stable 12V DC output. That means less load on shore power or your generator and reliable performance for larger battery banks. It's a practical way to support demanding RV setups without working your electrical system harder than it needs to.
RV electrical systems see a lot of use, and small power issues can turn into bigger headaches when they affect lights, control boards, or entertainment systems. This converter delivers stable DC power whether or not a battery is connected, helping keep sensitive electronics running smoothly. Built-in protections guard against over-current, over-temperature, over-voltage, and reverse polarity conditions, so wiring mistakes or sudden load changes don't cause damage. Three onboard LED indicators make it easy to check system status at a glance, letting you know when everything is operating normally or if there's an issue that needs attention.
Converter replacements don't always happen in wide-open compartments with perfect mounting surfaces. This deck-mounted converter is built to be flexible, so it can be installed horizontally, vertically, or even upside down depending on the space you're working with. The integrated 20-amp AC power cord keeps wiring straightforward, and the vented housing allows proper airflow in multiple mounting orientations. Insulated connections help protect wiring during installation and long-term use. It's a practical fit when your existing distribution panel is still in good shape and you just need a reliable converter charger to keep your RV's 12V systems running. If you'd like help with the install, you can use etrailer's installer locator to find a qualified shop near you.
Ratings & Reviews
I am pleased to have this back up in the event that I need it!
Product might be okay but it was supposed to arrive by Tuesday and it did not. I had to go buy one elsewhere as I needed by the date it was supposed to be here by.
Item was exactly what was advertised. Works much better than my old broken unit.
Just what I needed. Shipped quick and was a perfect replacement.
Was simple to install. Direct swap for the old WFCO Converter. Seems to charge the lithium just fine.
Naomi did great service got the part today it's already installed issues resolved thank you e trailer
Product came quickly and packaged well. item was a drop in replacement for original equipment.
Direct replacement of non auto detect unit with a cooling fan failure. Works as it should. Fast delivery!
This one started right up and is working as expected. However, this is the third WFCO Auto-Detect 55AMP in a coach that is only 4 years old. Each time it stops recognizing that we have lithium batteries and stays at a charge rate of 13.4 instead of 14.6 volts. We continue to purchase this unit because it is the only unit that will fit in the space that Airstream 30 Classic gave us. Keep your fingers crossed on how long it works. It never died; it stopped charging the lithium batteries correctly. It is easy to install, two wires, a ground wire and plug in behind the electrical panel.
Brielle understood my needs perfectly and helped me look for an upgrade, this is the best one available. She was great, installation was simple, works great.
Rick
So far, so good. Quieter than the factory converter and easy to install. I like that it can be used with Lithium batteries too.
Got it, intalled seems to work just as it should. Thanks for rapid shipping.
Exact same item, exact same fitment.
Emily the rep made sure I got the correct item, shipped quickly. Made for a quick simple replacement.
Great site selling authentic parts! Bought this unit after being ripped off by A**zon sending me a Chinese knock off after I paid for this exact OEM part and was sent a cheap copy for $333.00 ! Etrailer sent me the correct part fast for the same price. You guys have gained a customer for life.
The purchasing process was very easy and easy to track the shipping. Kind of cool how you guys post pics of the staff handling each phase of the process. I purchased this converter as a spare as im guessing mine will fail soon enough since the cooling fan no longer works. In the mean time I have the comfort of knowing I have one on the shelf if mine fails.
I purchase the new auto-detect converter charger so that I could upgrade my battery on my rv to a lithium battery. As promised it was a simple disconnect 3 wires remove the old converter and install the new converter and reconnect the 3 wires. I was told that I would receive the converter on Monday, but it showed up on Saturday, two days early. Thanks e-
trailer for the great advice on the converter and getting it to me quickly.
I am going to switch my batteries from lead acid to lithium. This converter should be an updated version to be compatible with lithium battery detection. Looks like an easy switch I can do myself. Easy order process and prompt delivery. Thanks.
I ordered this unit to carry in my camper for back up. I replaced the last one about 5 yrs ago. They a have a lifespan it seems, and want to have a reliable replacement on hand for our extended upcoming trip.
Replacing a deck mount converter charger is extremely straightforward. I replaced our non-lithium converter charger with this one that supports lithium and is also auto detect. Like most RV's, our converter charger is in a location behind the power distribution panel so you have to remove that entire panel to get to it. Makes absolutely no sense but remember, we're talking about RV engineers. This is what makes the auto detect extremely nice to have. Once you have access it's just a matter of removing the old converter charger and wiring up the new one the exact same way. If you're like me and are overly cautious, before removing the old converter charger just whip out the cell phone and take a picture of the wiring. Before you button everything back up I would plug the RV into shorepower and make sure the converter charger is charging. It would suck to put everything back together just to find out it was not charging. Other than those few things, like I said, it's an extremely easy replacement.
I recently upgraded to the WFCO 9855AD. It was very easy to swap the old for the new and I have had no issues with it. I know that there are some who have issues with the auto detect function, but there is a very good video on YouTube put out by the National RV Training Academy that explains how it works and how to set it up. There are no switches or jumpers that need to be set, you just need to make sure that the Lithium battery is below 50% charged so that the unit will go thru a complete charging cycle. Highly recommend watching the video.
The only concern I had in ordering this was the photo on the web site showed that this came with a different type of plug than the standard residential three prong. After talking with Ashley E. in customer service, I did order it and am happy to say that it does have the standard three prong plug.
Thank you for getting my order out in a timely manner!
The converter is working great. I would highly recomend for fast charging. I am using it with 4, 100ah Li batteries.
I needed to replace the converter on my RV to switch to lithium batteries. I originally tried to save some Pennie’s by purchasing a cheaper brand on Amazon, big mistake. I should have known spending a little more money and getting service and advice from E-Trailer would save me time and money in the long run. The unit worked immediately and flawlessly so far.
fans run surprisingly cool. I have a 660ah battery bank and I can run a 12volt AC at max all day and my batteries are at 100%. You can hear the charge kick in every once in a while and top off the batteries. I'm very happy with this purchase.
Do you have a question about this Power Converter?
Info for this part was:
At etrailer 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.
Gwendolyn Y.
4/23/2026
Thanks for sharing your experience! Glad to hear everything is working smoothly with your new setup. Making the switch to lithium is a big upgrade, and it’s great that the converter performed right out of the box. We appreciate you giving us a shot and are always here if you need anything down the road!