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
2.4/5
For overlanders who want a tough, potted charger that can live in the engine bay and take solar too. Buyers mounting inside the cabin can get similar charging for much less.
- 40 ACharge current
- 12 VBattery
- 32 V maxPV input
- 2 yearsWarranty
Check price at Amazon$585.62
Price checked October 22, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Charges from the alternator and solar panels at the same time, using solar first
- Sealed, fan-free and rated for engine-bay heat up to 176 °F, so it can mount under the hood
- Runs from 12 V or 24 V vehicles and supports variable-voltage and idle-stop alternators
- Draws under 8 mA in standby, so it won’t flatten a parked vehicle’s battery
Cons
- Costs about three times as much as 40 A chargers from Renogy or Redodo
- Only four fixed charge profiles, no custom voltages
- No Bluetooth or app; status is shown on LEDs only
- Two-year warranty is short for the price
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 | BCDC1240D |
|---|---|
| Charging | |
| Type | DC-DC charger with MPPT solar input |
| Charge current | 40 A |
| Battery voltage | 12 V |
| Lithium profile | Yes |
| Custom profile | No |
| Temperature sensor | No |
| Standby draw | 8 mA |
| Inputs | |
| Max PV voltage (Voc) | 32 V |
| DC input range | 9 to 32 V |
| Smart alternator | Yes |
| Ignition sensing | Yes |
| Monitoring and build | |
| Bluetooth | No |
| Display | No |
| Load output | No |
| Cooling | passive (fan-free) |
| Dimensions | 6.5 x 4.75 x 1.47 in |
| Weight | 2.2 lb |
| Warranty | 2 years |
Alternatives in this type
Kisae Abso DMT1250
#10 in DC-DCFull 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
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.
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Compare
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