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 2.9. The ATEM POWER 25A DC-DC MPPT Charger leads on value. The Redarc BCDC Alpha 25 wins on features and warranty. The ATEM POWER 25A DC-DC MPPT Charger costs $539.01 less ($149.99 vs $689).
Redarc BCDC Alpha 25
#7 in Up to 30 AFull review
For 4x4 and truck builds that need the toughest sealed charger with Bluetooth. Buyers on a budget get more amps per dollar elsewhere.
Redarc $689$689
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 value ($6 per amp ($149.99, 25 A) vs $27.56 per amp ($689, 25 A)).
- Choose the Redarc BCDC Alpha 25 for features (solar input, smart alternator support, Bluetooth vs solar input, smart alternator support) and 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 | Redarc BCDC Alpha 25 |
|---|---|---|
| Overall rating | 3.3/5 | 2.9/5 |
| Value 30% | 71 $6 per amp ($149.99, 25 A) | 0 $27.56 per amp ($689, 25 A) |
| Charge current 20% | 75 25 A | 75 25 A |
| Efficiency 10% | 50 efficiency not published (neutral score used) | 50 efficiency not published (neutral score used) |
| Features 20% | 50 solar input, smart alternator support | 75 solar input, smart alternator support, Bluetooth |
| Warranty 20% | 0 1-year warranty | 25 2-year warranty |
Specifications
| ATEM POWER 25A DC-DC MPPT Charger | Redarc BCDC Alpha 25 | |
|---|---|---|
| Charging | ||
| Charge current | 25 A | 25 A |
| Input battery | 12 V | 12/24 V |
| Output battery | 12 V | 12 V |
| Battery types | AGM, gel, calcium, lead acid, LiFePO4 | AGM, gel, calcium, standard lead acid, LiFePO4, heated LiFePO4 |
| LiFePO4 profile | Yes | Yes |
| Smart alternator support | Yes | Yes |
| Solar | ||
| Solar input | MPPT | MPPT, up to 500 W |
| Max solar voltage | - | 48 V |
| Build | ||
| Bluetooth | No | Yes |
| Ingress rating | - | IP67/IP69K |
| Weight | 3.2 lb | 2 lb |
| Warranty | 1 year | 2 years |