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
3.0/5
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.
- 40 ACharge current
- NoSolar input
- 90%Efficiency
- 2 yearsWarranty
Check price at Amazon$155.99
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- One of the cheapest 40 A chargers, at under $4 per amp
- A second output limits current to 20 A for small batteries or small alternators
- Knob selects LiFePO4 or lead-acid; can wake a lithium battery after a BMS shutdown
- Input and output are isolated
Cons
- Not waterproof, so it is not for boats or engine bays
- No app, display, temperature sensor or custom voltages
- Few published specs: no input voltage range or standby draw
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 | L12V40A-DC-E |
|---|---|
| Charging | |
| Charge current | 40 A |
| Output battery | 12 V |
| LiFePO4 profile | Yes |
| Peak efficiency | 90% |
| Isolated | Yes |
| Solar | |
| Solar input | No |
| Build | |
| Bluetooth | No |
| Warranty | 2 years |
| Released | 2024-06 |
Alternatives in this current
Sterling Power BB1270 70A
#15 in 40 A and upFull review
For boats and large RVs with a big lithium bank and an alternator rated well above 90 A.
Amazon $698$698
Kisae Abso DMT1250
#17 in 40 A and upFull review
For RV owners who want 50 A and a wired remote display without paying Victron or Redarc prices. The short warranty and one-source-at-a-time design hold it back.
Amazon $349$349
Compare
Also compared with: BougeRV Sunflow 40A (charge controller), EPEVER Tracer 4210AN G3 (charge controller), LiTime 30A MPPT Bluetooth (charge controller), LiTime 60A MPPT Bluetooth (charge controller), Renogy Rover 40A (charge controller).
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