Redodo 12V 40A DC-DC with MPPT
#13 in 40 A and upFull review
For budget van and trailer builds that want alternator and solar charging in one cheap box. Specs are thin, so pick it on price rather than features.
Amazon $165.99$165.99
3.0/5
For boats and large RVs with a big lithium bank and an alternator rated well above 90 A.
- 60 ACharge current
- NoSolar input
- 94%Efficiency
- 2 yearsWarranty
Check price at Amazon$698
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Bidirectional: keeps the start battery topped up from solar on the house bank
- Jump start mode charges a flat start battery from the house bank
- Turns on from alternator voltage, an ignition feed or engine vibration
- Very high current for big lithium banks and high output alternators
Cons
- Back ordered on Amazon at the time of checking
- No solar input
- Only a 2 year warranty
- No Bluetooth; the remote is an extra cost
The Sterling Power BB12 family
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 (this one) | 60 A | 3.0/5 | $698 |
| Sterling Power BB12120 120A | 110 A | 3.4/5 | $763.30 |
How it scores
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.
Specifications
| Model number | BB1270 |
|---|---|
| Charging | |
| Charge current | 60 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 | 2.2 lb |
| Warranty | 2 years |
Alternatives in this current
Renogy 12V 40A DC-DC Charger
#14 in 40 A and upFull review
A cheap, quiet way to add alternator charging to a van or camper with a lithium house battery. Pay more for Victron if you want built-in Bluetooth.
Amazon $177.64$177.64
LiTime 12V 40A DC-DC Charger
#16 in 40 A and upFull review
A bare-bones, low-cost alternator charger for a lithium house battery in an RV or van. Spend more for smart-alternator details, monitoring or a solar input.
Amazon $155.99$155.99
Compare
Compare the Sterling Power BB1270 70A with any other DC-DC charger →
More from Sterling Power: every Sterling Power product ranked.