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 3.0. The ATEM POWER 25A DC-DC MPPT Charger leads on value and features. The Sterling Power BB1225 25A wins on warranty. The ATEM POWER 25A DC-DC MPPT Charger costs $100.01 less ($149.99 vs $250).
Sterling Power BB1225 25A
#6 in Up to 30 AFull review
For boats and vans where keeping the start battery charged matters as much as the house bank.
Amazon $250$250
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 $10.42 per amp ($250, 24 A)) and features (solar input, smart alternator support vs smart alternator support).
- Choose the Sterling Power BB1225 25A 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 | Sterling Power BB1225 25A |
|---|---|---|
| Overall rating | 3.3/5 | 3.0/5 |
| Value 30% | 71 $6 per amp ($149.99, 25 A) | 31 $10.42 per amp ($250, 24 A) |
| Charge current 20% | 75 25 A | 70 24 A |
| Efficiency 10% | 50 efficiency not published (neutral score used) | 100 98% 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 | Sterling Power BB1225 25A | |
|---|---|---|
| Charging | ||
| Charge current | 25 A | 24 A |
| Input battery | 12 V | 12 V |
| Output battery | 12 V | 12 V |
| Battery types | AGM, gel, calcium, lead acid, LiFePO4 | - |
| LiFePO4 profile | Yes | Yes |
| Smart alternator support | Yes | Yes |
| Peak efficiency | - | 98% |
| Solar | ||
| Solar input | MPPT | No |
| Build | ||
| Bluetooth | No | No |
| Weight | 3.2 lb | 1.3 lb |
| Warranty | 1 year | 2 years |