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
2.9/5
For 4x4 and truck builds that need the toughest sealed charger with Bluetooth. Buyers on a budget get more amps per dollar elsewhere.
- 25 ACharge current
- MPPT, up to 500 WSolar input
- 2 yearsWarranty
Check price at Redarc$689
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- IP67 and IP69K sealing for engine bay, washdown and water crossing use
- Bluetooth app control built in
- Takes up to 500 W of solar at up to 48 V
- Heated lithium profile for batteries with built-in heaters
Cons
- Among the most expensive chargers here per amp
- Only a 2 year warranty
- No published efficiency
The Redarc BCDC Alpha family
Every Redarc BCDC Alpha model we rank, smallest first. Ratings compare each against its own current.
| Model | Charge current | Rating | Price |
|---|---|---|---|
| Redarc BCDC Alpha 25 (this one) | 25 A | 2.9/5 | $689 |
| Redarc BCDC Alpha 50 | 50 A | 2.8/5 | $735 |
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its current. How we rank explains each one.
Specifications
| Model number | BCDC12025B |
|---|---|
| Charging | |
| Charge current | 25 A |
| Input battery | 12/24 V |
| Output battery | 12 V |
| Battery types | AGM, gel, calcium, standard lead acid, LiFePO4, heated LiFePO4 |
| LiFePO4 profile | Yes |
| Smart alternator support | Yes |
| Solar | |
| Solar input | MPPT, up to 500 W |
| Max solar voltage | 48 V |
| Build | |
| Bluetooth | Yes |
| Ingress rating | IP67/IP69K |
| Weight | 2 lb |
| Warranty | 2 years |
Alternatives in this current
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
Redarc BCDC Classic 25
#8 in Up to 30 AFull review
For overlanders who want a proven engine bay charger. It costs far more than the budget brands.
Amazon $477$477
Compare
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