Very good charger. I use it to recharge my lifepo4 batteries. It is one of the more powerful charger for that price range.My battery backup us currently working on 12 volts....after revising my choices, I will go for a 24 volts system. That charger is also capable of handling a 24 volts setup. Once again one of rhe best buy I did.

High quality product.

I'm not an electrical engineer so I can't speak about the tech. However practically it has worked great for us in a small travel trailer outfitted with 2 100 ah lithium batteries, solar panels and limited space. It the batteries, inverter, and solar charge controller live under one on the dinette benches with added temperature activat4ed fan. Works well with a small generator to charge the batteries fairly quickly. We've bounced it over 12k miles from coast to coast and it hasn't let us down. It was an easy install. We left the existing converter in place and just turned off its breaker.

I have been designing an appropriately-sized PV array and recently got a good hybrid charge controller. At some point, I actually stopped as I realized, the panels cannot be recycled. I chose to go with my old favorite, a good sized generator.I looked at various power modules and compared (by eye and review) the different options. DC-DC choppers, various charger types and then I found this one. I was sold on the PFC which is a HUGE deal. I grabbed one.I have not had this very long but the load testing has been outstanding. It is able to keep up with continuous, pulsed power devices (such as monitors, UPS's and regular inductive loads. I wish it had synchronous rectification as there is a requirement that there will be an off draw unless it is disconnected from the battery load. Schottky diodes are employed and that is the only downside here. Otherwise, once I have the new generator in place I will test that next. The unit appears to be very sturdy and as a bonus, the input VAC can be 70-140 VAC with auto throttling (!!) of the output current instead of shutdown for line voltage! It is even somewhat tolerant to variable AC line frequency (I don't yet know about how it deals with line harmonics coming to the output... but will simulate as many single-phase ones as I can. Stiff systems are prevalent here.VERY GOOD QUALITY.

Excellent warranty

Great product for us living off grid I have flooded deep cycle batteries and was getting poor results changing with today's smart chargers, I will be upgrading to lithium ion phosphate batteries shortly and this charger does them all.I had a few questions about how to properly install to parallel batterie bank and they had all the answers. Thanks to this companie who cares and answers their phone. northern ontario canada 🇨🇦.

Defective right out of the box.I purchased this unit in early FEB2020 for LiFePo4 4s 12vDC @ 100aH battery bank for off-grid system. It was sold by the Inverter Store. They have a great reputation in the off-grid industry. The unit arrived in a few days from Navada to Detroit. I did open it until today (22FEB20). The manufacturing date on the box says it was produced on 19APR2019.The batteries were ordered on the same day from a well known China Website and distributor. However, the Corona Virus and Lunar New Year slowed shipping. The batteries and BMS arrived today and are new in box. I wired the batteries in series with bus bars, and installed the BMS. I then discharged the batteries down to 20% with a 1000W Pure Sine Wave inverter. I removed the cables (4 AWG welding cables) from the inverter and installed them on the charger. I heard what sounded like relays click inside the charger (could have been something else) and it indicated a fault (red light) as the unit was in the "on" position when it arrived. I did not see any flash or arc from the cables when I installed them to this unit. I turned the unit's switch to the "off" position and plugged it into my house AC system. I turned the unit on and it did not power up. I tried several times by unplugging the unit and removing the battery cables several times to no avail. The red fault light would return every time I tried to cycle this unit. I performed this cycle in my heated garage at 60F after the batteries warmed to room temperature. (never charge LiFePo4 batteries near freezing temperatures 32F).I could not ever get this unit to power on. I checked my house signal and it was 120.4v AC, 60.1 Hz and a very clean signal (sine wave). In addition, I was very careful NOT to reverse the polarity of the unit. I purchased welding cable (4 AWG) in Red and Black to ensure there was no reverse polarity situation for charger and inverter. I removed this unit and re-installed the 1000W inverter and the inverter worked fine. So the issue was not the BMS/Batteries. It was certainly the charger.This is highly frustrating because the design specifications are exactly what I am looking for. I planned to charge at .5C (50A). This unit claims to provide 75A @ 12V, so there is a safety margin and the unit would never get to 100% (75A). The BMS is rated for 60A. So the design specifications are perfect for my needs; however, the manufacturing quality is the issue. This unit is produced in China and it has the "QC OK" stickers. I have been to several dozen China manufacturing plants (automotive components). The World Class manufacturing methods have not been adopted by most of the manufacturers that I visited. So purchasing anything produced in China is a crap shoot, especially anything electrical or highly technical.I initiated a return so I will report if there are any issues with the return from the Inverter Store. They have a very good reputation and I do not expect any issues on the return. Hopefully this unit can be repaired with something as simple as a blown fuse. This unit is sealed and there are no serviceable parts.I will update this when my return is processed.

As mentioned in other reviews, this charger has active power-factor correction (PFC), very important for getting more usable power out of small generators! It's strange they don't advertise this feature, which let me pull 35-40% more charging power from a little Honda EU-1000i, vs. the similarly efficient but non-PFC Iota DLS-27-25 this unit replaced, which had to be derated from 25A to ~22A out to avoid overloading the Honda. It's nice having a simple adjustment dial for limiting current; my Iota required physically changing shunt resistors inside.Adjusted for about 74% of max output, this AIMS delivers 740W (28.0A @ 26.4VDC) into my 24V battery bank while pulling 890W (900VA) AC from the generator, at an excellent 0.97-0.98 power factor as measured by a Kill-a-Watt. 740W out / 890W in = 83% efficiency, as specified - good but not great. It uses ordinary Schottky diodes on the output rather than synchronous rectification, which could have boosted the efficiency a bit.The main negative I see is that it draws a small but significant parasitic DC current, if left connected to a battery bank with no AC power source - this is worse if you leave its toggle switch on, a full 5.0W (0.2A @ 26V) on a 24V bank, or 3.2W at 12V (0.24A @ 13.4V), but even with the switch off it pulls a constant 0.11-0.13A depending on DC battery voltage (about 1.5W at ~12V, 3.2W at ~24V). This is as much as leaving a small 12V incandescent bulb running constantly, or several LED bulbs, and could easily drain a battery if left connected for a long time with no power, as might happen on an RV or boat. So, if you plan to leave this permanently wired to the batteries, I'd recommend a suitably rated DC breaker, switch, or relay to isolate its output when not actively charging.In my case I already had a 50A DC breaker in series with the output, and with a manually-started generator it's hardly any trouble to make sure that's breaker's turned on only when charging. An auto-start generator might require more attention.As soon as DC voltage is connected to the terminals, a relay "clunk" can be heard inside-- I suspect it's the large 100A relay (CAR1AP100DC12-S) showing in one of my photos, perhaps meant to protect against reverse polarity (coil wired to DC terminals w/diode in series?), or else something to do with the automatic 12V/24V detection and switching. If so, its coil current may account for most of the ~120mA constantly drawn even with the power switch turned off. Parts of the control circuitry appear to be powered from the attached battery as well.If you connect AC with no battery attached, though, it doesn't power up at all, pulling 0W AC (but 11-20VA; probably filter caps across the line) and putting no voltage at all on its DC terminals. This means you can't charge a completely dead battery, and someone not expecting this behavior (which the manual fails to mention) might think the charger is completely dead.The manual could use improvement generally, and is completely wrong in some places, like where it mentions 12V-vs-24V having to be manually selected.Other than that, the charger seems to be well-built, with good input filtering and noise suppression. I've attached some photos of the internals, taken when I briefly opened it to reverse the fan airflow direction to avoid fighting natural convection when mounting it when the DC terminals facing up. It's easy to get into, with only 6 small screws to remove and no seals, adhesive, etc. The large electrolytic caps are "YST" brand, which I'm not familiar with. I can't read the brand markings on the three smaller ones behind the fan without disassembling further.There is at least one trim pot on the control board (fixed in place with some glue or epoxy material), which might be usable for fine-tuning voltage if none of the four DIP-switch selectable defaults quite fit your need, though I didn't try this. Without opening it up, it may also be possible to dial down the voltage by plugging a variable resistor into the battery-temp sensor jack.

After combing through the specs and doing some math, I had a hunch this switching converter had Active Power Factor Correction that is not found in most other chargers. I took the chance and I'm glad I did.The power factor for this unit is 0.94 or better. This means when you are running from a generator or off grid using solar, it is as efficient as they come. Most other switching converters have a power factor of 0.72 which means you have to supply it 10 amps @ 120v (1200 watts) to create a charge of 781 watts (55 amp) to your batteries. Where you will normally be wasting 300+ watts with most other converter / chargers, you will not have that issue with this charger.As for the Fan, the unit I received has a 2 level fan, low when the charge current is low and full when charging at higher levels. It is not very loud to me and I am very happy with it.The seller should really update their page to indicate this is a convert / charger with PFC.. It is worth every penny.