Sterling Power
Sterling Power BB484830 – 48V to 48V 30A DC-DC Battery Charger
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The Sterling Power BB484830 is a 48V-to-48V battery-to-battery (DC-DC) charger rated at 30A, built for high-voltage 48V systems that need a controlled, isolated charge from one 48V source to another. It's a natural fit for larger marine, off-grid, and high-power expedition builds standardising on 48V.
Like the rest of Sterling's battery-to-battery range, it delivers a true multi-stage charge (bulk, absorption, float) with multiple battery-type profiles rather than simply paralleling banks, so your 48V bank is charged correctly and completely.
Charging Specifications
| Type | 48V → 48V battery-to-battery (DC-DC) charger |
|---|---|
| Nominal voltage | 48V input / 48V output |
| Max output current | 30A |
| Charge stages | Multi-stage: bulk, absorption, float |
| Battery types | Lead-acid, AGM, gel, and lithium |
| Input voltage range | 39–65V DC |
| Output voltage range | 38–62V DC |
| Reverse / jump-start current | 10A |
| Continuous rated output power | Approximately 1400–1700W |
| Continuous rated input power | Approximately 1400–1800W |
| Efficiency | 98% |
| Quiescent current | 5mA |
| Operating temperature | -20°C to +60°C |
| Dimensions | 270 × 130 × 73mm |
| Weight | 1.8kg |
| Cooling | Thermostatically controlled, variable low-speed fan |
| Protections | Self-recovering: under-voltage, input over-voltage, output over-voltage, over-current, over-temperature |
| Certifications | CE, UKCA, E-Marked (24*10R06/01*3789*00) |
| Warranty | 5-year return-to-factory |
Key Features
- Dedicated 48V-to-48V DC-DC charging at 30A
- True multi-stage charge with multiple battery-type profiles
- Suits lead-acid, AGM, gel, and lithium 48V banks
- Activation via an 8–80V ignition-feed signal or a selectable vibration-sensor mode
- Optional BBR remote control for live voltage/current monitoring, custom profiles, and adjustable current limiting at 100%/85%/65%
- 5-year return-to-factory warranty
Why Controlled Charging Matters
Directly paralleling two 48V lithium banks that are at different states of charge can create dangerous current flows capable of disabling BMS units. The BB484830's controlled, multi-stage charging avoids that risk entirely by charging one bank from the other correctly, rather than simply tying them together.
Need exact cabling recommendations for a 48V install? Contact us and we'll confirm from the datasheet.
Presented by Overland Kitted
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