Review of PowerMax PM3-55 55 Amp 12V Power Supply

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I needed to upgrade the converter on my older motorhome. The 30-amp converter it had supplied unfiltered, unrgulated power to the various circuits, which is fine for incandescent bulbs, but not for powering electronics or modern LED lighting. The old converter also had a fairly ineffective 5-amp charger.

This PowerMax converter supplies clean well-regulated and filtered power to all circuits with an upgraded 55-amp capacity. It also functions as a "smart" multi-stage battery charger, delivering a bulk charging rate up to its full 55-amp rating. This is important for automatic faster charging from shore power or generator without having to resort to an external battery charger.

The PowerMax line of converter/chargers seem to offer features and performance equal to the other brands (Iota, Progressive Dynamics) at a significant price savings.

Installation is easy. If you are replacing a similar converter, it is as simple as disconnecting the DC leads from the old converter and attaching to the new one. Can't get much easier than that. If, however, you are upgrading a 6300 series Progressive Dynamics converter, it is just a little bit more difficult. It involves gutting the old converter and installing the new one in its place, along with a simple wiring modification. If you search the internet for "progressive 6300 converter upgrade" you will find step by step instructions, with photos. If you are handy, the job can be completed in an hour or so, and at significant savings compared to the "official" upgrade from Progressive, which costs about 2.5 times what this does. I found that I had to bend the mounting ears of the PowerMax to get it to fit inside the gutted chassis of the old converter, but it was very easy.

With just a little bit of work, my coach now has a modern converter with multi-stage charger for just a little over a hundred dollars. So far I am pleased with its performance. If I had to complain about something, it would be the fan, but all similar converters have such a fan. The fan on this unit only runs when needed rather than continuously as some do. In many installations it will be hardly noticeable. As a 6300 upgrade, it might be a bit more audible when running, because the converter vents into the living area, but that also provides for better cooling less risk of overheating and damaging the converter.

Overall the 55 amp PowerMax converter is a great value, and enabled me to upgrade to a 55-amp unit at a lower price than other brands' 30or 45-amp converters. This makes me very happy with my purchase.

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This unit is well made, strong, and simple to use. I like that it works as both a battery charger and a power converter (to power 12v units independently, through household AC current). I have only used it for 3 weeks, so I can't rate it 5 stars yet. Very pleased.

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thanks for the best charger that i have ever bought. 2 hour charge gets me a week off the grid, my battery bank can hold all the juice that it can put out. when i build a bigger battery bank i will order another.....

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this works better then the original one that came with my Winnebago and I am truly happy with it. It charges my batteries fast.

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These power supplies from Powermax work really well and solve the problem of using traditional automatic chargers to keep a car battery charged. I use various emergency and security 12 volt supplies in my home. They are all powered by 12 volts. I also have a deep cycle battery on each one. This provides the charging without the nasty ac hum on the 12 volts. I recommend that you use this product. Ham radio operators like myself also might find it useful. You can keep a deep cycle battery under your operating desk and keep it charge with this power supply. This was not possible when all you could get was car battery chargers. The AC hum from car chargers ruins your signal.