For boats and large RVs with a big lithium bank and an alternator rated well above 140 A.
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Every Sterling Power BB12 model we rank, smallest first. Ratings compare each against its own current.
| Model | Charge current | Rating | Price |
|---|---|---|---|
| Sterling Power BB1225 25A | 24 A | 3.0/5 | $250 |
| Sterling Power BB1240 40A | 38 A | 2.6/5 | $381.65 |
| Sterling Power BB1270 70A | 60 A | 3.0/5 | $698 |
| Sterling Power BB12120 120A (this one) | 110 A | 3.4/5 | $763.30 |
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its current. How we rank explains each one.
| Model number | BB12120 |
|---|---|
| Charging | |
| Charge current | 110 A |
| Input battery | 12 V |
| Output battery | 12 V |
| LiFePO4 profile | Yes |
| Smart alternator support | Yes |
| Peak efficiency | 94% |
| Solar | |
| Solar input | No |
| Build | |
| Bluetooth | No |
| Weight | 4 lb |
| Warranty | 2 years |
For boats and big RV banks that need lots of alternator current and fine control over charge voltages. Van builders short on space will find the Orion XS smaller and easier.
Amazon $318.75The value pick for vans and campers that want alternator and solar charging in one box. It costs well under half as much as a Redarc dual-input unit for more current.
Amazon $269.99For a budget build where price matters most and the vehicle has a conventional alternator.
Amazon $121.90Compare the Sterling Power BB12120 120A with any other DC-DC charger →
More from Sterling Power: every Sterling Power product ranked.
