Sapphire Energy
AIMS 36/48V Converter/Charger 25A UL & CSA
AIMS 36/48V Converter/Charger 25A UL & CSA
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AIMS 36V/48V Converter & Battery Charger
Reliable AC charging for your higher-voltage battery bank. The AIMS Power CON120AC3648VDC delivers up to 25A at 36V or 18.75A at 48V, making it a practical charging solution for off-grid cabins, higher-voltage RV systems, compatible golf-cart batteries, and mobile power setups.
Recharge from shore power or a generator, select your battery voltage and charging profile, and adjust the current to suit your bank. With support for LiFePO₄ and compatible lead-acid batteries, it’s a useful dedicated charger or backup charging source when solar production falls short.
- Useful Charging Power — up to 25A at 36V or 18.75A at 48V for replenishing your battery bank.
- Shore Power & Generator Charging — recharge at home, at a campsite, or during a cabin generator run.
- Adjustable Output — set charging current from 20–100% of rated output to suit your batteries and available power.
- Selectable 36V or 48V Operation — one charger for compatible systems at either voltage.
- Multi-Chemistry Flexibility — selectable profiles for LiFePO₄, AGM, gel, and flooded lead-acid batteries, subject to matching charging requirements.
- Certified & Backed — listed to UL 458 and CSA C22.2 No. 107.1 standards, with a 2-year manufacturer’s warranty.
Cloudy weather, shorter winter days, or extra power use can leave your battery bank needing a boost. This converter lets you add AC charging from a generator or shore-power connection without replacing your existing solar equipment.
For example, bringing a 48V-class 100Ah battery bank from 20% to 80% requires approximately 60Ah. At a sustained 18.75A, that’s around 3.2 hours of charging before allowing for taper, connected loads, and operating conditions.
Use solar when it’s available, then top up from AC power when needed. A dedicated charger gives you another way to restore your battery reserve after a busy day or several days of poor solar production.
When multiple charging sources operate together, keep their combined charging current within your battery bank’s permitted limit.
Choose 36V or 48V manually using the voltage-selection switch, then select the appropriate battery profile. Unlike the AIMS 12V/24V model, this version does not automatically choose the bank voltage.
The adjustable current dial lets you reduce output for smaller batteries or limited AC supplies. Its Bulk, Absorption, and Float stages manage recharge and maintenance, while connected DC equipment can use part of the available output.
Battery chemistry alone does not establish compatibility. Confirm the selected charging and float voltages against your battery manufacturer’s requirements, particularly for lithium packs with different cell counts.
Disconnect AC and battery power before changing voltage, battery-profile, or current settings.
- Off-grid cabins with compatible 48V battery banks
- RVs, campervans, and bus conversions using higher-voltage systems
- Compatible 36V or 48V golf-cart and utility-vehicle banks
- Marine battery banks with a suitable dry charger location
- Mobile work rigs and equipment trailers
- Solar systems needing an additional AC charging source
- Manual 36V / 48V voltage selection
- Four selectable charging profiles
- Three-stage Bulk, Absorption, and Float charging
- Charging-current adjustment from 20–100% of rated output
- LED charging and fault indicators
- Thermal- and load-controlled cooling fan
- Optional battery temperature sensor connection
- Support for up to two matching chargers in parallel
- Reverse-polarity protection using fuses, plus voltage, current, and temperature safeguards
- Included 4-foot hardwired AC power cord
| Specification | Value |
| Model | CON120AC3648VDC Manual designation: CON120AC36/48VDC |
| Charger Type | AC-to-DC converter / battery charger |
| Battery System Voltage | 36V or 48V — manual selection |
| Maximum Output Current | 25A at 36V 18.75A at 48V |
| Current Adjustment | 20–100% of rated output Approximately 5–25A at 36V Approximately 3.75–18.75A at 48V |
| AC Input Voltage | 96–145VAC: full performance 70–96VAC: approximately 50% rated output |
| Output at Reduced AC Input | Up to 12.5A at 36V Up to 9.375A at 48V |
| AC Input Frequency | 40–70Hz |
| Nominal AC Input Current | Less than 9A at rated output, per manufacturer |
| Battery Profiles | LiFePO₄, flooded lead-acid, AGM, gel Confirm voltage compatibility before use |
| Charging Stages | Bulk, Absorption, Float |
| Efficiency | Approximately 80% or higher |
| Parallel Operation | Maximum two matching units Up to 50A at 36V or 37.5A at 48V |
| Cooling | Thermal- and load-controlled fan |
| Battery Temperature Sensor | Optional — sold separately |
| Operating Temperature | −10°C to +40°C ambient |
| Storage Temperature | −20°C to +80°C |
| Relative Humidity | 5–95%, non-condensing |
| Acoustic Noise | Approximately 50dB(A) or less at 1 metre with fan running |
| Dimensions (D × W × H) | 10.25″ × 6.75″ × 3.25″ Approximately 260 × 171 × 83mm |
| Unit Weight | Approximately 2.9kg / 6.5lb |
| Boxed Weight | Approximately 3.2kg / 7lb |
| AC Power Cord | 4-foot hardwired cord — included |
| DC Output Connections | Bolted terminals with M6 attachment screws |
| Safety Standards | UL 458 and CSA C22.2 No. 107.1 |
| Warranty | 2-year manufacturer’s warranty |
Switches 1 and 2 select the battery profile. Switch 3 selects the bank voltage. For a compatible 48V-class LiFePO₄ bank, all three switches are ON.
| Battery Profile | Switch 1 | Switch 2 |
| Flooded / Open Lead-Acid | OFF | OFF |
| Gel | OFF | ON |
| AGM | ON | OFF |
| LiFePO₄ | ON | ON |
Switch 3: OFF = 36V. ON = 48V.
Follow the switch numbers and ON marking on the unit. Disconnect AC and battery power before changing settings, then reconnect the battery before applying AC power.
| Profile | 36V Charging / Float | 48V Charging / Float |
| Gel | 41.4V / 40.8V | 55.2V / 54.4V |
| AGM | 42.6V / 40.8V | 56.8V / 54.4V |
| LiFePO₄ | 43.2V / 41.4V | 57.6V / 55.2V |
Confirm charging and float voltages against your battery manufacturer’s specifications. For the flooded lead-acid profile, confirm the applicable voltage settings with AIMS before use.
Install in a dry, ventilated location with room for cooling airflow. Use appropriately sized DC cables, suitable battery-side circuit protection, and an AC supply that meets the manufacturer’s requirements.
Select the correct voltage and charging profile before use. Connect the battery before applying AC power, and keep the converter protected from rain, snow, and battery gases. Follow the AIMS manual for grounding and installation.
Use the same charger for your compatible cabin, utility-vehicle, or workshop battery banks. Add SB50 connector kits to your charging leads and matching connections at each bank for convenient plug-in connections.
Choose contacts that suit your cable size and matching housings at each connection. Different housing colours may be keyed differently; use a consistent colour scheme to help distinguish banks of different voltages.
Disconnect AC power before connecting or unplugging the DC leads. Check the voltage, battery profile, and current setting whenever you move between banks.
Is this suitable for my 48V lithium battery bank?
It can be a practical charger for a compatible 48V-class LiFePO₄ bank, including a 51.2V nominal bank whose manufacturer permits the selected charging voltages.
The lithium profile uses 57.6V charging and 55.2V float in 48V mode. Confirm both values and the charging-current limit against your battery specifications before connecting.
How long will it take to recharge my bank?
For a 48V-class 100Ah bank going from 20% to 80%, approximately 3.2 hours at a sustained 18.75A is a useful starting estimate.
Allow extra time for charging taper, connected equipment, and operating conditions. A larger bank takes proportionally longer—for example, a 200Ah bank needs around twice as long for the same percentage increase.
How do I set the DIP switches?
Switches 1 and 2 choose the battery profile:
- Flooded lead-acid: OFF / OFF
- Gel: OFF / ON
- AGM: ON / OFF
- LiFePO₄: ON / ON
Switch 3 chooses voltage: OFF for 36V, or ON for 48V. For a compatible 48V-class LiFePO₄ bank, set all three switches to ON.
Disconnect AC and battery power before changing settings. Confirm the profile voltages suit your battery, then reconnect the battery before applying AC power.
Does it automatically detect 36V or 48V?
No. This model uses a manual voltage-selection switch. Set Switch 3 to match your bank before connecting and powering the charger.
That gives you flexibility to use one charger across compatible 36V and 48V systems, provided you check its settings each time you move it.
Can I use it with a portable generator?
Yes. It’s a useful backup when your cabin or RV needs more charging than solar can provide. Connect it to a suitably sized generator and recharge while AC power is available.
Full performance requires 96–145VAC. Between 70 and 96VAC, output is reduced to approximately half its rating. Allow enough generator capacity for the charger and any other equipment running at the same time.
Can I move it between battery banks?
Yes. Add SB50 connector kits to the charging leads and matching connections at each prepared bank. For example, use the charger at your cabin, then move it to a compatible utility-vehicle bank at home.
Use correctly sized contacts, consistent polarity, and suitable battery-side circuit protection. Disconnect AC before unplugging the DC connection, and check the voltage, profile, and current settings before reconnecting.
Can it charge a golf-cart battery bank?
It can charge a compatible 36V or 48V bank when its profile voltages and current match the batteries’ requirements. It’s useful for setups needing a separate AC charger or convenient removable charging leads.
Check compatibility with the battery or vehicle manufacturer, including any charging interlock requirements. It is not a universal replacement for every golf-cart charger.
Can it charge while my equipment is running?
Yes. With a compatible battery bank connected, charger output can support DC loads while the remaining current charges the batteries.
For example, in 48V mode a 5A load leaves approximately 13.75A for charging when the converter is delivering its full 18.75A. Higher loads leave less available for the battery.
Can I use it alongside solar charging?
Yes. Use solar for everyday charging and add AC power when cloudy weather or extra consumption calls for a boost.
Set both charging sources appropriately and keep their combined output within your battery bank’s maximum permitted charging current.
Can I add a second charger later?
Yes. AIMS supports up to two matching units in parallel, giving up to 50A at 36V or 37.5A at 48V. That can help shorten recharge time for a larger bank.
Your battery bank, wiring, circuit protection, and AC supply must support the combined output.
Can I leave it connected to shore power?
The charger transitions to Float after charging, allowing it to maintain a bank that permits the selected float voltage.
For extended storage, follow your battery manufacturer’s recommendations and periodically check the battery and charging system.
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