ATEM POWER 25A DC-DC MPPT Charger
#4 in Up to 30 AFull review
A low cost dual input charger for a single 100 Ah battery in a 4x4 or small camper.
Amazon $149.99$149.99
The ATEM POWER 25A DC-DC MPPT Charger is the better DC-DC charger overall, rated 3.3 to 3.1. The ATEM POWER 25A DC-DC MPPT Charger leads on charge current, features and value. The Renogy 20A DC-DC Charger wins on warranty. The Renogy 20A DC-DC Charger costs $9 less ($140.99 vs $149.99).
Renogy 20A DC-DC Charger
#5 in Up to 30 AFull review
For a van or camper with one 100 Ah lithium battery and a short cable run. It does the basic job well at the lowest price of the big brands.
Amazon $140.99$140.99
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 ATEM POWER 25A DC-DC MPPT Charger for charge current (25 A vs 20 A), features (solar input, smart alternator support vs smart alternator support) and value ($6 per amp ($149.99, 25 A) vs $7.05 per amp ($140.99, 20 A)).
- Choose the Renogy 20A DC-DC Charger 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 up to 30 A DC-DC charger; a clear win is highlighted. How we rank explains each one.
| Factor weight | ATEM POWER 25A DC-DC MPPT Charger | Renogy 20A DC-DC Charger |
|---|---|---|
| Overall rating | 3.3/5 | 3.1/5 |
| Value 30% | 71 $6 per amp ($149.99, 25 A) | 59 $7.05 per amp ($140.99, 20 A) |
| Charge current 20% | 75 25 A | 50 20 A |
| Efficiency 10% | 50 efficiency not published (neutral score used) | 67 94% peak efficiency |
| Features 20% | 50 solar input, smart alternator support | 25 smart alternator support |
| Warranty 20% | 0 1-year warranty | 25 2-year warranty |
Specifications
| ATEM POWER 25A DC-DC MPPT Charger | Renogy 20A DC-DC Charger | |
|---|---|---|
| Charging | ||
| Charge current | 25 A | 20 A |
| Input battery | 12 V | 12 V |
| Output battery | 12 V | 12 V |
| Battery types | AGM, gel, calcium, lead acid, LiFePO4 | AGM, gel, flooded, LiFePO4 |
| LiFePO4 profile | Yes | Yes |
| Smart alternator support | Yes | Yes |
| Peak efficiency | - | 94% |
| Solar | ||
| Solar input | MPPT | No |
| Build | ||
| Bluetooth | No | No |
| Ingress rating | - | IP32 |
| Weight | 3.2 lb | 2.7 lb |
| Warranty | 1 year | 2 years |