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Review of Firman Generators - Gas/Propane Inverter Generator - FIR54FR

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Firman Generators - Gas/Propane Inverter Generator - FIR54FR Review

Jeff: Hello everybody. This is Jeff at Today we're going to take a look at this Ferman 3,300 watt portable RV dual fuel invertor generator with the electric start. Now this 3,300 watt generator will provide electricity for your home, your work or your play. It uses a very easy electric start. It has a dual fuel capability, which provides flexibility during these trips or in an emergency.

It has a four stroke, 171 CC dual fuel engine that'll use either standard unleaded gas or propane. No need to mix any gas in oil like on a two cylinder engine. Does use cast iron cylinder sleeves to help ensure a nice long engine life. I mentioned it's an electric start engine, so it does offer easy push buttons start up. Right here is the button to push to start it.

Also offers this ergonomically designed recoil handled that'll reduce the effort to pull start the engine if the need arises.I did want to zoom in on there and talk about some of the connections on front. On the front here, it'll give you a . right over here, there's a 12 volt DC outlet, 8.3 amps. It also gives you a five volt, 2.1 amp USB outlet right here. They all have covers on.

You can see which is nice, keeps any dirt out. Also, has this pull the cover up, there's your larger 120 volt, 30 amp TT30R, provides an RV connection point. Put the cover back on. Then down here you can see it offers 120 volt, 20 amp, 520R duplex outlet. This will power any household appliance or tools.

As I mentioned, if you notice all of those plugins have covers on it. Those will help keep out any moisture or debris. It does have push to reset the circuit breakers. That'll stop the power flow to connected devices if an overload is detected. Right here, there's a little readout that's a three-in-one data minder. It'll monitor voltage frequency and running hours.If we swing it around to this other side, this is your muffler right up front here. It does offer a whisper series muffler to don't show quiet operation, won't drowned out any campground conversation. Right here, they do use an arrester. It's a USDA Forest Service certified spark arrestor prevents release of any flammable debris.Now the safety features on this to promote accident free use has a light up indicator that'll turn on when low oil was detected. The engine automatically stops if oil level is too low for safe use. It has an automatic voltage regulator to help minimize voltage fluctuations.The wheels on it, let me zoom back out, these are five and a half inch diameter heavy duty wheels. In the front here has this nice fold down handle. Just pop it up just like that, and then you can lift up on it and it'll roll on the wheels so it makes it very easy mobility.The engine in it is a nice clean running engine meets the carb and EPA standards. A few specs on that engine, the starting surge power output. If you use it as gas or be 3,300 watts. If you uses propane, it's 3000 watts. The running rated power output as gas would be 3000 watts, propane, 2,700 watts.Now this part does come with everything shown here on the table. Just to go through them. It comes with the generator. Right here, it comes with this five foot long propane hose with the regulator. Basically, when you hook this up to your propane and you have your plug, that will plug right into here on the side. Then right above it is another little plug for the power. Once you get that connected, hook that to your propane. It can run off propane. What's nice, if you notice it has this nice clip on it, spring loaded clip, that'll allow you to just hook it to the handle there. Comes with a 12 volt DC battery float charger right here. Comes with a battery charge cable that you can plug in and charge the battery on there. Comes with the container of 10W-30 engine oil. Comes with the oil funnel to get it in there. Spark plug wrench, screwdriver, and then nice owner's manual and a quick reference guide.Noise level on this is 58 decibels. Normal conversation is about 60, so it's pretty quiet. The fuel type we mentioned is either gasoline or propane. Fuel tank capacity is 1.8 gallons. You can see it's right at the very top here. Put your fuel right in there. Oil capacity is 20.3 ounces. As I mentioned it comes with the 10W-30 that's the recommended oil for it.I do want to give you some dimensions on this. The overall length of this, if we go, it's about 23 inches long. The height the unit is going to be right at about 17 inches tall. The width on it, let me just spin it around this way, is going to be right about 17 inches wide. The dry weight on this is about 108 pounds.One note, I do want to mention that as gas generators will produce carbon monoxide, which is poisonous, so for safety, you always want to make sure to operate the gas power generator outdoors. Again, just to spin it around to show you the front is where your muffler comes through. We mentioned that swing up handle. On the other side you can actually, there's Phillips screws here, if you unbolt them, and you could take that off and get access to maintain your engine on the inside. Very nice design. That should do it for the review on this Ferman 3,300 watt portable RV dual fuel inverter generator with the electric start.

Dave S.


Can the Firman inverter/generator be operated from low-pressure, central propane supply? A friend bought one, and unscrewed the Forman-supplied high-pressure regulator from the external "throttle-diaphram". However, neither of us can figure out the type of female thread on the throttle-diaphram body. It appears to me metric (M12?), but will not work with a 1.0, 1.25, or 1.5 thread. Does anyone know the thread size & type?

Etrailer Expert

Jon G.


If you were to connect the Firman Generator # FIR54FR directly to your low propane setup on your RV then you will actually just plug right up to the quick disconnect on the Firman generator and connect that to your propane line. With that being said, when I reached out to my contact at Firman he did say that they only recommend using their whole regulator setup to ensure that the low pressure is exactly what is needed for the generator.

Dave S.


@JonG I Disagree with you. On the Firman WH-03042 Inverter Generator, the LP gas adapter actually has what appear as two regulators. The smaller is a standard Hi-Pressure LP tank regulator 50/2 lb. unit. The second, and larger,is actually a Demand/Metering regulator that actually controls the amount of LP gas fed to the engine as a function of manifold pressure. This type of arrangement is common on small Dual Fuel engines. You NEVER want to bypass the metering regulator, as you suggested. I am happy to report that I now know the answer to my original question. The thread on the LP Tank regulator to the larger Demand/Metering regulator is a M12 x 1.0 thread. The 1.0 ("1") thread is relatively uncommon, but adapters are available on [the internet]. Thanks again to all!

Steve B.


@DaveS Can you let me know where you found this adaptor? I want to do the same thing you are doing and have not been able to find the M12 x 1.0 thread adaptor that you mention. Thanks!

Info for this part was:

Employee Jeff D
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Jeff D

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