Calculate what size DC-DC charger (booster/B2B) you need to charge your house battery from the alternator while driving.
Recommended DC-DC charger
40 A
480W @ 12V
Daily charge
1440 Wh
| A | W | |
|---|---|---|
| 20A | 240W | Insufficient |
| 30A | 360W | Insufficient |
| 40A | 480W | Sufficient |
| 50A | 600W | Sufficient |
| 60A | 720W | Sufficient |
We calculate how much energy you want to replenish per day, divide by your driving hours, and round up to the nearest common DC-DC charger size. We account for the maximum charge rate of your battery type (0.5C for lithium, 0.1C for lead-acid).
This calculation is an estimate. Actual charge current depends on alternator capacity, cable thickness and ambient temperature. Consult a professional for installation.
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