Renogy 40A DC-DC MPPT Charger
#12 in 40 A and upFull review
A cheap dual input charger for a van with a 200 Ah lithium bank and a modest solar array.
Amazon $185.38$185.38
The Renogy 40A DC-DC MPPT Charger is the better DC-DC charger overall, rated 3.2 to 3.1. The Renogy 40A DC-DC MPPT Charger leads on features. The Redodo 12V 40A DC-DC with MPPT costs $19.39 less ($165.99 vs $185.38).
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
Prices were last checked October 31, 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 Renogy 40A DC-DC MPPT Charger for features (solar input, smart alternator support vs solar input).
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 | Renogy 40A DC-DC MPPT Charger | Redodo 12V 40A DC-DC with MPPT |
|---|---|---|
| Overall rating | 3.2/5 | 3.1/5 |
| Value 30% | 89 $4.63 per amp ($185.38, 40 A) | 97 $4.15 per amp ($165.99, 40 A) |
| Charge current 20% | 0 40 A | 0 40 A |
| Efficiency 10% | 56 93% peak efficiency | 56 93% peak efficiency |
| Features 20% | 50 solar input, smart alternator support | 25 solar input |
| Warranty 20% | 25 2-year warranty | 25 2-year warranty |
Specifications
| Renogy 40A DC-DC MPPT Charger | Redodo 12V 40A DC-DC with MPPT | |
|---|---|---|
| Charging | ||
| Charge current | 40 A | 40 A |
| Input battery | 12 V | - |
| Output battery | 12 V | 12 V |
| Battery types | AGM, gel, flooded, LiFePO4 | - |
| LiFePO4 profile | Yes | Yes |
| Smart alternator support | Yes | - |
| Peak efficiency | 93% | 93% |
| Solar | ||
| Solar input | MPPT, up to 670 W | MPPT |
| Build | ||
| Bluetooth | No | No |
| Ingress rating | IP31 | - |
| Weight | 2.6 lb | 2.4 lb |
| Warranty | 2 years | 2 years |
| Released | 2026-08-23 | 2023-07 |