Sterling Power
Sterling Power BB1270 – 12V 70A DC-DC Battery Charger
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The Sterling Power BB1270 is a 12V-to-12V battery-to-battery (DC-DC) charger delivering up to 60A at 13.8V — a versatile mid-to-large charger for lithium and AGM auxiliary banks in vans, campers, and overland rigs. It converts your alternator into a controlled, multi-stage charge source while protecting the starter battery.
Unlike a voltage-sensitive relay, the Saturn charger measures both current and voltage to move intelligently through bulk, absorption, and float, giving your batteries a correct, complete charge on every drive. Six preset profiles (Lead, AGM, and Lithium — two of each) plus custom profiles via the optional BBR remote suit virtually any chemistry.
Charging Specifications
| Type | 12V → 12V battery-to-battery (DC-DC) charger, Saturn series |
|---|---|
| Input voltage range | 9–16V |
| Max output current | 60A at 13.8V |
| Max output power | ~828W |
| Max input current | 70A |
| Efficiency | 92–94% |
| Reverse / jump-start current | Up to 20A |
| Battery profiles | Lead I/II, AGM I/II, Lithium I/II (6 presets) + custom via BBR remote |
| Temperature sensor | TEMP1 included |
| Cooling | Thermostatically controlled, variable-speed fan |
| Protections | Self-recovering: under-voltage, input & output over-voltage, over-current, over-temperature |
| Recommended input cable / fuse | 16mm² (6AWG) / 80A |
| Recommended output cable / fuse | 16mm² (6AWG) / 80A |
| Dimensions | 200 × 130 × 56 mm |
| Weight | 1.0 kg |
| Operating temperature | −20°C to 60°C |
| Certifications | CE, UKCA |
| Warranty | 5-year return-to-factory |
Key Features
- Up to 60A output at 13.8V for mid-to-large lithium and AGM banks
- Bidirectional reverse-charge (jump-start assist) of up to 20A
- Six battery profiles plus custom charge profiles via the optional BBR remote
- Lithium-safe: a live output wakes most BMS units; charging is disabled below 0°C when the temp sensor is fitted
- Self-recovering protections and conformal-coated internals; CE/UKCA approved; 5-year warranty
Smart Alternator / Euro-6 Ready
Three engagement modes cover any vehicle: automatic voltage sense (turns on above 13.5V input), ignition-feed control (for smart/Euro-6 alternators), and vibration sense (begins charging after detecting engine vibration — no ignition wire required).
Installation Notes
Requires a common, direct negative between the starter battery, charger, and auxiliary bank. The positive input must come from a circuit with a starter battery or Alternator Linearisation Device — not straight off a bare alternator. Rate the charger to no more than ~80% of your alternator's output. Fuse both input and output; recommended cable is 16mm² (6AWG) with 80A fusing for runs under 3m.
Presented by Overland Kitted
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