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 $175.99$175.99
The Redodo 12V 40A DC-DC with MPPT is the better DC-DC charger overall, rated 3.0 to 2.9. The Redodo 12V 40A DC-DC with MPPT leads on warranty. The Schumacher SDC371 40A DC-DC costs $116.04 less ($59.95 vs $175.99).
Schumacher SDC371 40A DC-DC
#17 in 40 A and upFull review
A very cheap way to try alternator charging on an older vehicle, if the third party listing holds up.
Amazon $59.95$59.95
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Redodo 12V 40A DC-DC with MPPT for warranty (2-year warranty vs 1-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 40 A and up DC-DC charger; a clear win is highlighted. How we rank explains each one.
| Factor weight | Redodo 12V 40A DC-DC with MPPT | Schumacher SDC371 40A DC-DC |
|---|---|---|
| Overall rating | 3.0/5 | 2.9/5 |
| Value 30% | 93 $4.40 per amp ($175.99, 40 A) | 100 $1.50 per amp ($59.95, 40 A) |
| Charge current 20% | 0 40 A | 0 40 A |
| Efficiency 10% | 56 93% peak efficiency | 50 efficiency not published (neutral score used) |
| Features 20% | 25 solar input | 25 solar input |
| Warranty 20% | 25 2-year warranty | 0 1-year warranty |
Specifications
| Redodo 12V 40A DC-DC with MPPT | Schumacher SDC371 40A DC-DC | |
|---|---|---|
| Charging | ||
| Charge current | 40 A | 40 A |
| Input battery | - | 12 V |
| Output battery | 12 V | 12 V |
| Battery types | - | standard, gel, AGM, calcium, lithium |
| LiFePO4 profile | Yes | Yes |
| Smart alternator support | - | No |
| Peak efficiency | 93% | - |
| Solar | ||
| Solar input | MPPT | MPPT |
| Build | ||
| Bluetooth | No | No |
| Ingress rating | - | IP66 |
| Weight | 2.4 lb | - |
| Warranty | 2 years | 1 year |
| Released | 2023-07 | 2022-10-01 |