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The KISAE BDC4825 is a fully automatic bi-directional DC-DC battery charger purpose-built for 48V house battery systems in RVs, boats, vans, and off-grid installations. Accepting input from both a 12V or 24V vehicle alternator and a solar array up to 100V VOC, the BDC4825 keeps your 48V house battery bank charged from every available power source without the need for external relays or additional controllers. Whether you're on the road, on the water, or miles from the grid, the BDC4825 has you covered.
The built-in MPPT solar controller delivers greater than 98% tracking efficiency, extracting maximum power from your solar array across the full 15V–100V VOC input range. When alternator input is available, the BDC4825 draws up to 25 amps from a 24V alternator system or up to 12.5 amps from a 12V system to efficiently charge the house battery bank through its microprocessor-controlled multi-stage charging algorithm, covering Bulk, Absorption, Float, and Recharge stages for GEL, AGM, Flooded, Lithium, and Programmable battery types. Five configurable priority modes let you define exactly how solar and alternator inputs work together, and the smart charging feature automatically regulates output based on connected DC loads to prevent unnecessary cycling and protect battery health.
The BDC4825 also brings a capability rarely found in DC-DC chargers: bi-directional reverse charging. When your alternator or starter battery runs low, simply activate the reverse charge port and the house battery becomes the DC source, delivering 13.5V at up to 25A to a 12V alternator system or 27V at up to 25A to a 24V system, getting you back up and running without needing a jump start. The included backlit LCD remote display monitors house battery voltage, charging current, and charging status in real time, while the CAN BUS communication port allows integration with compatible vehicle and marine control networks.
Questions about pricing? Call us at 1-800-367-3019 or e-mail us at [email protected].
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Product Features- Bi-Directional 48V, 25A DC-DC Battery Charger
- Dual input sources - solar and alternator (12V or 24V) supported simultaneously
- Built-in MPPT solar charge controller
- Multi-stage charging algorithm
- Gel, AGM, Flooded (with equalization), Lithium, and Programmable battery charge settings
- Lithium battery kick-start function
- Bi-directional, reverse charging
- Ignition start port
- Removable backlit LCD remote display
- CAN BUS communication port
- Quiet mode
- Smart load detection
- Hardwire DC connections
- CE EMC / tested to E9-09
- 2 year warranty
Protection Features- DC output short circuit protection (Auto shutdown, auto reset)
- Overcharge protection (Auto shutdown, auto reset)
- Solar over-voltage shutdown (100V, auto recovery 98V)
- Alternator over-voltage shutdown (12V system: 16.0V, auto recovery; 24V system: 32.0V, auto recovery)
- Alternator under-voltage shutdown (12V system: 10.5V; 24V system: 21.0V)
- House battery high-voltage shutdown
- House battery low-voltage protection
- Over-Temperature De-Rating
- Over-Temperature Shutdown
Included Accessories- Detachable LCD remote with backlight - Displays voltage, current, status & error codes
Optional Accessories:
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