AIMS AC-DC Converter Battery Chargers



Boasting versatility and a high charging capacity, the AIMS 12V and 24V AC 75-Amp Converter/Battery Charger from AIMS Power provides wide latitude to meet the demands of many applications. This unit’s broad AC input range of 70VAC to 145VAC can handle many applications and battery technologies. It automatically detects 12VDC and 24VDC battery banks. Useful with generators and shore power, it can charge batteries including open lead acid, AGM, gel and LiFeP04.

This unit’s 75-amp charging capacity gets the job done in a hurry. It can charge a 100 amp-hour battery up to a 90 percent charge in less than an hour. That makes it ideal for RVs, boats, campers and many other applications.

Reverse-polarity, over-voltage and under-voltage protections provide peace of mind along with short-circuit and over-temperature safeguards. Listed to UL 458 and CSA 22.2, this unit comes with a two-year manufacturer’s warranty.

Instruction manual can be found here:

Additional information

Weight 7 lbs
Dimensions 14 × 7 × 5 in


Parameter Value
Model 12/24v 36/48v
Input Parameters
Input Voltage 96-145VAC full performance
70-96VAC automatically de-rate to 50% of full load current
Frequency 40Hz to 70Hz
Nominal Input Current at Rated Output <9Aac
Voltage Measurement Accuracy ±8Vac
Frequency Measurement Accuracy ±1Hz
Nominal Voltage 12/24Vdc Auto adjustable 36/48Vdc Manual adjustable
Output Current
Output current 75A for 12V mode
Output current 37.5A for 24V mode
Output current 25A for 36V mode
Output current 18.5A for 48v mode
Current Accuracy ± 6% of full rated output current @25°C, for target currents across the range from 10% rated output (for absorption exit criteria accuracy) to the current limit setpoint.
Load Regulation 1.5%
Current Limit 75-80Amp 25-30Amp
Dead-Battery Charging 8-14.9Vdc at 100% of rated output current Not specified
8-29.8Vdc at 100% of rated output current Not specified
Selectable Battery Type Open Lead-Acid, Gel, AGM, LiFePo4, adjustable
Parallel Outputs Maximum of two AC converter units connected in parallel
Efficiency 80%
Protection Parameters
Reverse Battery Polarity Protection Non-destructive reverse battery polarity protection with fuses. Permanent damage will not occur and perform after fuse replacement.
Input Under-voltage No permanent damage for input voltages from 0-300Vac. Shutdown or input current limit or other means may be applied when input voltage is out of normal operating range.
Output over voltage

12/24V mode

12Vdc. Unit will shut down if Vcharging > Vcharging (target) + 1.0Vdc for more than 2 seconds; unit will restart when voltage <= Vcharging (target) for more than 2 seconds.
For battery OVP the unit will restart in the same stage.
24Vdc. Unit will shut down if Vcharging > Vcharging (target) + 1.5Vdc for more than 2 seconds; unit will restart when voltage <= Vcharging (target) for more than 2 seconds.
For battery OVP the unit will restart in the same stage.
Charger over temperature protection The internal temperatures of the charger will be measured by NTC. Based on these measurements, unit will shut down if the temperature exceeds 105°C. Unit will restart when environment temperature cools to 95 °C.
BTS(Battery Temperature Sensing) The battery temperature sensor allows the charge controller to continuously adjust charge voltage / charge current based on actual battery temperature.

When the battery temperature is over 40 °C, unit will reduce the charging voltage to Float voltage, also it will reduce the Max charging current by 10% with every two degree of temperature rise.

When the battery temperature is over 50 °C, unit will shut down.

Operation temperature Nominal ambient temperature: 25°C

Operating Ambient Temperature range: -10°C to 40°C

(On the heat sink of DC-DC part, if the temperature is over 90 ℃, the Charger Current will be de-rate to 50% ; if the temperature is over 105 ℃, the Unit will be shut down.)

Relative humidity 5~95% without condensation
Noise Unit requirements: below 50dB (A) measured at 1 m distance with fan full working.
Storage Conditions Temperature -20°C to +80°C
Cooling Fan always on, vented
Safety UL458,CSA22.2#107.1
Dimension (D x W x H) mm 10.25” * 6.75” * 3.25”
Unit Weight 6.5 lb
Boxed Weight 7 lb


12/24v Model Install & Configuration Video

36/48v Model Install & Configuration Video

4 reviews for AIMS AC-DC Converter Battery Chargers

  1. Mitch (verified owner)

    I purchased this charger to provide a much faster way to charge all of different types of batteries I have for my projects. This consistently outputs 72-75 amps for the duration of the charge cycle. While it’s not quiet, I do not find it to be unreasonably loud either. I really appreciate the current adjustable knob on the device, although I wish it was easier to adjust. If you need a 12 or 24 volt charger, and want something that’s high-quality, this is your purchase.

    One word of caution – if you leave your battery on (some BMS’s will let you turn off the output) and you leave this charger connected, but off, there is a parasitic power draw for the internal relay anywhere from 15-30 mA. However, if you leave the charger on and connected, it outputs enough current to negate the amount of power that’s consumed by the internal relay.

  2. Harry Futrell (verified owner)

    My battery charger was dead on arrival. Need to know how to get it replaced?

    • Dexter


      Hi Harry,

      Sorry that you are having trouble with the charger. We are issuing you a return label today, you can send the charger back to us. We will test the charger and if it is indeed defective, we will replace it immediately at no charge to you. This is in line with our customer-oriented warranty policy that can be found at

      Thank you so much for choosing us and we promise to get this issue resolved in as timely of a manner as possible.

      Yours truly,
      Dexter Monroe

  3. Kevin D (verified owner)

    Great charger from AIMS. Perhaps a bit overkill if you’re just charging 1 battery then putting it in your solar system but if you want a solid yet flexible 120V converter charger this does it all. This can charge 4 different battery chemistries, including lithium, with unique parameters for each battery type. For a 24V battery bank, like I have, this is worth its weight in gold. I can charge each battery at 12V individually, then once connected up as 24V I can charge the batteries using the same device .

    The 2 stage fan stays in low speed if the charge current dial is adjusted to its lowest output setting (19A @ 12V / 9.5A @ 24V). The fan is loud if pushing the rated current but the fan does a great job keeping the device cool (5.5 hours was my longest charge and it didn’t break a sweat).

  4. Jon A (verified owner)

    I bought two of these, one each 12V/24V and 36V/48V. I have two off-grid solar power systems, and I needed a way to charge my 24V system battery bank on those rare times when solar just can’t keep up. For my 48V system, I wanted a back up charger.

    These converter/chargers are very compact, easy to install, configure and I had them up an running in less than an hour each. I installed them as a permanent part of each system. When needed, I just turn them on and they charge my battery banks. The only one issue I have with them is the fans. I have the current on maximum, and the fans are very loud. Other than that, These are great chargers that are very flexible and configurable covering all my needs.

    Whether you have 12V/24V or 48V, Lead Acid, AGM or Lithium batteries, these have the bases covered. I think they are a great value for the price and performance. 5 stars all the way!

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