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 Renogy 12V 40A DC-DC Charger wins on efficiency. The Renogy 12V 40A DC-DC Charger costs $7.74 less ($177.64 vs $185.38).
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
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 smart alternator support).
- Choose the Renogy 12V 40A DC-DC Charger for efficiency (94% peak efficiency vs 93% peak efficiency).
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 | Renogy 12V 40A DC-DC Charger |
|---|---|---|
| Overall rating | 3.2/5 | 3.1/5 |
| Value 30% | 89 $4.63 per amp ($185.38, 40 A) | 92 $4.44 per amp ($177.64, 40 A) |
| Charge current 20% | 0 40 A | 0 40 A |
| Efficiency 10% | 56 93% peak efficiency | 67 94% peak efficiency |
| Features 20% | 50 solar input, smart alternator support | 25 smart alternator support |
| Warranty 20% | 25 2-year warranty | 25 2-year warranty |
Specifications
| Renogy 40A DC-DC MPPT Charger | Renogy 12V 40A DC-DC Charger | |
|---|---|---|
| Charging | ||
| Charge current | 40 A | 40 A |
| Input battery | 12 V | 12 V |
| Output battery | 12 V | 12 V |
| Battery types | AGM, gel, flooded, LiFePO4 | - |
| LiFePO4 profile | Yes | Yes |
| Smart alternator support | Yes | Yes |
| Peak efficiency | 93% | 94% |
| Isolated | - | No |
| Solar | ||
| Solar input | MPPT, up to 670 W | No |
| Build | ||
| Bluetooth | No | No |
| Ingress rating | IP31 | - |
| Weight | 2.6 lb | 4.1 lb |
| Warranty | 2 years | 2 years |
| Released | 2026-08-23 | 2025-09 |