
Sterling Power Battery to Battery Charger – 12V to 12V – 40A – DC Powered Charger
Tucked inside small boat engine compartments, the 1.2 kg Sterling Power BB121240 onboard marine battery charger provides 40A four-stage charging to replenish 12V auxiliary banks from Euro 6 engine alternators.
- Single output supplies 40A current.
- Four-stage charging protects battery health.
- High efficiency exceeds 95 percent.
- Status LED interface shows stages.
- Compact lightweight body weighs 1.2kg.
Compact 12V charging conversion is the listed role of theSterling Power 12V to 12V 40A DC-to-DC Battery Charger, which provides up to 40 amps for small boats, campervans, and Euro 6 engine applications. It accepts a 12V DC source and supplies 12V DC charging output to a separate battery bank using listed LiFePO4, AGM, gel, and flooded battery types.
The 4-stage smart charging program manages the listed charge sequence. A status LED provides local indication, while included temperature compensation supports the charging function. IP21 protection, ignition protection, input and output reverse-polarity protection, and natural convection with fan assistance are listed.
Key Specifications of the Sterling Power 12V to 12V 40A DC-to-DC Battery Charger</h2
- Forty-amp output supports listed small-boat and campervan charging applications.
- The 12V input matches the listed source-system requirement.
- 12V output charges the listed separate destination battery bank.
- LiFePO4 and lead-acid profiles cover the listed battery chemistries.
- Four-stage smart charging manages the listed charge sequence.
- Over 95 percent efficiency limits conversion losses during charging.
- A status LED provides the listed local charger indication.
- Included temperature compensation supports the listed charging function.
- Reverse-polarity protection covers the listed input and output connections.
- Natural convection with fan assistance manages operating heat.
Warranty and Support
Warranty information is not included in the listed product data. Review the manufacturer documentation for product details, setup, and warranty coverage.
Before Ordering the Sterling Power 12V to 12V 40A DC-to-DC Battery Charger
Before ordering, confirm that both your source system and destination battery bank are 12V DC and use a listed battery chemistry. Review the 40-amp output, temperature-compensation function, IP21 protection, ignition protection, cooling method, and installation space. You should confirm compatibility with your battery manufacturer and vessel electrical system before purchase.
Product Specifications
Sterling B2B 12V to 12V/40A
| Brand | Sterling Power |
|---|---|
| SKU | BB121240 |
| Output Current | 40 Amps |
| Input Voltage | 12V DC |
| Output Voltage | 12V DC |
| Battery Types | LiFePO4, AGM, Gel, Flooded |
| Algorithm | 4-Stage Smart Charging |
| Efficiency | >95% |
| IP Rating | IP21 |
| Ignition Protected | Yes |
| Communication | Status LED Interface |
| Temp Compensation | Included |
| Safety Protections | Input/Output Reverse Polarity |
| Cooling | Natural Convection / Fan |
| Dimensions | 190 x 160 x 70 mm (7.5x6.3x2.7") |
| Weight | 1.2 kg (2.6 lbs) |
| Certifications | CE, E-Marked, RoHS |
| Application | Small Boats, Campervans, Euro 6 Engines |
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Free standard delivery to the United States, Canada and Australia.
Product Support
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