Sterling Power
Sterling Power BB4812 – 48V to 12V DC-DC Converter Charger
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The Sterling Power BB4812 is a 48V-to-12V DC-DC converter charger. It steps a 48V supply down to a controlled 12V output, letting you run and charge a 12V system from a 48V bank — useful as 48V house architectures become more common in larger camper, marine, and off-grid builds.
It's a dual-purpose device. Connect a 12V battery on the output and it delivers a proper controlled multi-stage charge (bulk, absorption, float) rather than a crude fixed conversion. Or skip the battery entirely and use it as a standalone 12V power supply — its high-capacitance output stage delivers a stable, low-ripple 12V (13.8V default, adjustable) DC supply directly to 12V loads such as lighting, winches, and pumps, with no 12V battery required on the output at all.
Charging Specifications
| Type | 48V → 12V DC-DC converter charger |
|---|---|
| Nominal voltage | 48V input (39V–60V) / 12V output (13.8V default, adjustable) |
| Charge stages | Multi-stage: bulk, absorption, float |
| Battery types | Lead-acid, AGM, gel, and lithium |
| Max continuous output | 40A continuous (~550W) |
| Input voltage range | 39V–60V DC |
| Efficiency | 98% |
| Dimensions | 165mm × 130mm × 56mm |
| Weight | 1.0kg |
| Operating temperature | -20°C to +60°C |
| Cooling | Thermostatically controlled variable-speed fan |
| Protections | Under-voltage, input/output over-voltage, over-current, and over-temperature — all self-recovering |
| Warranty | Backed by Sterling's factory warranty |
Key Features
- Runs and charges 12V systems from a 48V bank
- Can be used as a standalone 12V power supply — no battery required on the 12V side
- High-capacitance output stage gives a stable, low-ripple 12V supply, with or without a buffer battery connected
- Controlled multi-stage charge (bulk/absorption/float) rather than a fixed conversion when a battery is connected
- Suits lead-acid, AGM, gel, and lithium 12V batteries
- 40A / ~550W continuous output at 98% efficiency
- Self-recovering protection against under/over-voltage, over-current, and over-temperature
Presented by Overland Kitted
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