Renogy 40A DC-DC MPPT Charger

Last updated: October 31, 2026

Renogy 40A DC-DC MPPT Charger
3.2/5#12 of 22 in 40 A and up DC-DC chargers
3.2

A cheap dual input charger for a van with a 200 Ah lithium bank and a modest solar array.

  • 40 ACharge current
  • MPPT, up to 670 WSolar input
  • 93%Efficiency
  • 2 yearsWarranty
Check price at Amazon$185.38

Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • 40 A alternator charging and a 670 W solar input for under $200
  • Light and compact at 2.65 lb
  • Smart alternator support
Cons
  • Uses solar or the alternator, not both at once
  • Warranty is listed as 2 years on the store and 1 year on Amazon
  • IP31 case must stay out of the weather

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 numberRBC40D1S
Charging
Charge current40 A
Input battery12 V
Output battery12 V
Battery typesAGM, gel, flooded, LiFePO4
LiFePO4 profileYes
Smart alternator supportYes
Peak efficiency93%
Solar
Solar inputMPPT, up to 670 W
Build
BluetoothNo
Ingress ratingIP31
Weight2.6 lb
Warranty2 years
Released2026-08-23

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