AIMS 36V 48V Smart Battery Charger AC Converter 25A ETL CON120AC3648DC

The first thing to know is that these are stackable. According to AimsPower, you can run up to 7 of these in parallel. I only have the generator for 2, so I'm getting 40 amps for my 400AH battery bank. My use is for home batteries and LiFePo 48v batteries. You should check the maximum acceptable input current for your situation so as not to cook your batteries. Being an off grid homeowner, I find this product a must own.

2 October 2022: I bought this charger on 9 September 2022. The charger is able to achieve max 19.1 amps higher than the rated 18.5 amps. The charging efficiency is around 80% even after using a step-down converter to convert 240v to 120v. The metal casing does gets pretty hot when running at full load hence the need for powerful fan. The only drawback is that the fan runs at full speed even when running at less than 50% load. 28 Nov 2022 Update: After less than 2 months of usage, problems start to emerge. When switching on, the green and yellow LED would light up (both solid) for about 62s indicating it is charging. But it isn't and the fan is not running. After that, the green LED would remain solid while the yellow LED blinks every 2s indicating it is on float charge BUT my LiFePo4 48v battery system is way below the 55.2v (around 50v-51v) specified on the operating manual for float charge. Email to the technical support on 18 Nov 2022 has went on deaf ears with no reply at all. So the charger has become an expensive USD275 paper weight collecting dust!

1st I think the price is a bit high but other than that I was taking a shot in the dark working with my battery pack. And it works!! The charger is used on a 14s NCM lithium pack. Each cell is 4.1V @ 100% and this charger brings it right to that point. Any larger and this charger wouldn't be able to do it. It is a little loud but that wasn't a factor for me. So far its handled about 15 cycles. I use 4 gauge lead wires which is way over kill but that's what is coming out of my battery so I match the connectors.

I use this to keep enough power in my off grid solar system (charge from the grid). Solid charger and you can select amount of power to charge, secondary use is when I lose AC, I can charge my off grid solar with a 2000 Watt generator vice a large house type unit.

One thing to know before you buy this is that the 25amps is ONLY at 36 volts, 48v only carries 18.75 amps (not 25). Also, for 48v (51.2v) LifePO4 batteries, per the manual, it is not capable of 58.4V as recommended by battery manufacturers. Verify before you buy. There are much cheaper chargers that do the 58.4 volts.

Unit arrived, configured, and operating as designed BUT the fan is out of control. I'm considering returning the unit for that reason alone. Its loud, high speed (too much for what needs to be cooled), and doesn't stop -- ever -- doesn't even slow down when at float. I don't know who designed this fan but they should be let go immediately. I'm not happy.

Funciona perfectamente en mis baterías agm lead carbon 12 voltios 250 amp funcionando a 48v gracias.

I have had 3 of these. One encountered the red light fault and wouldn't charge within an hour of first use. I sent it back and got another. After some more use, another one failed. I ordered this in 2022 so I opened it up to see if I can fix it. There is an internal slow blow fuse that had failed. I placed soldered a new fuse and mounted an external fuse holder so I can change fuses easier. I plugged everything back up and I still have the red fault light. I heard that a failed fan can also cause that so I will take a look at that next but don't have high hopes. Very frustrating these issues are so prevalent with such an expensive piece of equipment. I wonder when my other one will give out.

Great charger and Aims is great with customer service. Highly recommend