LiTime 12V 40A DC-DC Charger
#8 in DC-DCFull 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
2.8/5
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.
- 50 ACharge current
- 12 VBattery
- 32 V maxPV input
- 90%Efficiency
- 1 yearsWarranty
Check price at Amazon$349
Price checked October 22, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 50 A from the alternator or solar, enough to recharge a 100 Ah lithium battery in about 2 hours
- Comes with a remote display panel, and charge voltages are programmable
- Accepts 12 V or 24 V vehicle input
- Draws almost nothing when idle
Cons
- Uses solar or the alternator, not both at once
- Fan-cooled, so it makes some noise
- One-year warranty, the shortest here
- Temperature sensor is extra
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | DMT1250 |
|---|---|
| Charging | |
| Type | DC-DC charger with MPPT solar input |
| Charge current | 50 A |
| Battery voltage | 12 V |
| Lithium profile | Yes |
| Custom profile | Yes |
| Temperature sensor | Optional extra |
| Peak efficiency | 90% |
| Standby draw | 0 mA |
| Inputs | |
| Max PV voltage (Voc) | 32 V |
| DC input range | 10.5 to 32 V |
| Isolated | No |
| Smart alternator | Yes |
| Ignition sensing | Yes |
| Monitoring and build | |
| Bluetooth | No |
| Display | Yes |
| Load output | No |
| Cooling | fan |
| Dimensions | 9.5 x 6.7 x 2.9 in |
| Weight | 4.1 lb |
| Warranty | 1 years |
Alternatives in this type
Redodo 12V 40A DC-DC with MPPT
#9 in DC-DCFull 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
CTEK D250SE
#11 in DC-DCFull review
For owners of small lead-acid or lithium banks who want a sealed, set-and-forget charger that also keeps the starter battery topped up. Bigger lithium banks need a higher-current unit.
Amazon $404.85$404.85
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