12V to 24V LFP and Lead-Acid Battery Charger for RV and 12V/24V Dual Voltage Vehicles - OEMThe 1000W Vehicle in-cabin smart Auto On/Off Isolated DCDC 12/24V Battery Charger is a high-quality DCDC boost power converter designed for RV, electric trucks, and other vehicles with 12V and 24V dual voltage and dual battery systems. It is ideal for charging 24 volts LFP or Lead-Acid house battery with vehicle's 12V DC alternator.
A 24VDC RV house battery system would cut the current drawn by 50% for the same AC power level, allowing using thinner and lighter copper cables/fuses/copper bars, etc... Reduce the overall system cost or greatly increase the system safety and heat generation if cables kept the same. The benefit would be even greater if you have large solar panel array on the roof, and have high power equipment.With a nominal voltage rating of 24V and a nominal current rating of 36A, this charger offers efficient power conversion with a power rating of 1 kW. It features automatic voltage regulation, thermal protection, overload protection, and multiple other protection properties for safe and reliable operation.
With a compact surface mount design and easy installation, this unit is ideal for RV, trailer, and camper applications to charge the 24V LFP house battery with vehicle's isolated boost DCDC architecture maximized the safety. 12V and 24V circuits are separated by transformer, no worry for 12V battery damage or even fire with a failed MOSFET switch
Auto start to charge the house battery as the 12V alternator/input battery voltage is detected to reach high threshold indicating engine running/alternator working, auto stop as 12V alternator/input input battery voltage drop lower than the low threshold volt to prevent over discharge the regular automotive none-deep cycle lead acid battery.Charging algorithm optimized for both LFP and lead-acid batteriesDual automatic cooling fan to allow continuous 1 kW output charging powerLow 1mA idle current drawFor in-cabin installation onlyTechnical Specifications:
1.Application
This charger is designed for charging a 24 V auxiliary battery from a 12 V vehicle (e.g., RV) whiledriving.
- Supports 24V (8 cell in series) lithium iron phosphate batteries and 24V (12 in cell series) lead‑acid batteries.
Parameter
Value
InputVoltage
12–15 V
InputCurrent
85 A
OutputVoltage
28 V
MaxOutputCurrent
36 A
MaxOutputPower
1000 W
3.WiringMethod
- 12 V battery → Charger input
- Charger output → 24 V battery pack
- Fuses installed in both input and output lines.
Monitors vehicle’s 12 V battery voltage. Sleep Mode: Voltage ≤ 12.9 V (Corresponding to a full Lead-acid battery with engine/alternator off) Standby Mode: Voltage > 12.9 V Charging Start: Voltage > 13.3 V (indicating vehicle alternator working) Max output power limited to 1400 W. Will not overdraw vehicle’s 12V battery. Reduces output current if 12V battery voltage drops. Soft‑start design — no need to install a switch on the input side. <1mA sleep draw current, can be left connected. Input cable must be ≥ 25 mm² to avoid voltage drop.5.ParallelUse
- If alternator output ≥ 140 A, two chargers can be connected in parallel.
Do not connect directly to alternator without a lead‑acid battery. Install in a ventilated, dry location away from flammable/explosive materials. Keep out of reach of children. Ensure stable placement during use. Tighten battery cable bolts for good contact. This guide covers common models; principles are similar for others.Item
Specification
Size
Material
Aluminumhousing
Color
Blue
ContinuousPower
1000 W
OutputVoltage
InputVoltageRange
12–15 V
90%
SleepCurrent
< 1 mA
No‑loadCurrent
< 0.2 A
OperatingTemp
OperatingHumidity
StorageTemp
Cooling
85 °C
Constantcurrent
Weight
~ 2 kg
8.What is in the Package
Charger, cooper cable lugs, user manual
