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
3.1/5
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.
- 40 ACharge current
- NoSolar input
- 94%Efficiency
- 2 yearsWarranty
Check price at Amazon$177.64
Price checked October 22, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Recharges a 100 Ah lithium battery from flat in roughly 2.5 hours of driving
- Works with smart alternators; the ignition wire and a battery temperature sensor are in the box
- Fan-free, so it runs silently
- User mode lets you set your own charge voltages
Cons
- No built-in Bluetooth; the app needs the BT-2 module, sold separately
- No solar input
- Not isolated: input and output share a common negative
The Renogy DC-DC Charger family
Every Renogy DC-DC Charger model we rank, smallest first. Ratings compare each against its own current.
| Model | Charge current | Rating | Price |
|---|---|---|---|
| Renogy 12V 40A DC-DC Charger (this one) | 40 A | 3.1/5 | $177.64 |
| Renogy 12V 60A DC-DC Charger | 60 A | 3.7/5 | $202.49 |
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 | RBC40D1U |
|---|---|
| Charging | |
| Charge current | 40 A |
| Input battery | 12 V |
| Output battery | 12 V |
| LiFePO4 profile | Yes |
| Smart alternator support | Yes |
| Peak efficiency | 94% |
| Isolated | No |
| Solar | |
| Solar input | No |
| Build | |
| Bluetooth | No |
| Weight | 4.1 lb |
| Warranty | 2 years |
| Released | 2025-09 |
Alternatives in this current
Redodo 12V 40A DC-DC with MPPT
#13 in 40 A and upFull review
For budget van and trailer builds that want alternator and solar charging in one cheap box. Specs are thin, so pick it on price rather than features.
Amazon $165.99$165.99
Sterling Power BB1270 70A
#15 in 40 A and upFull review
For boats and large RVs with a big lithium bank and an alternator rated well above 90 A.
Amazon $698$698
Compare
Also compared with: BougeRV Sunflow 40A (charge controller), EPEVER Tracer 4210AN G3 (charge controller), Renogy Rover 40A (charge controller).
Compare the Renogy 12V 40A DC-DC Charger with any other DC-DC charger →
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