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The Renogy 40A DC-DC Battery Charger with MPPT charges a 12V house battery from your vehicle's starter battery or from solar panels. It draws from one source at a time and switches between them. DC input from the vehicle is the default, and you can press the SELECT button to give solar priority.
It is made for RVs, SUVs and boats where space is tight. The charger measures 7.68 x 5.87 x 1.89 in and charges AGM, Gel, Flooded and LiFePO4 batteries. Its cables come already attached, and the front panel has LEDs and one button, so there is no screen to learn.
The charger charges from the starter battery by default. Press SELECT to switch to solar priority. Renogy says the charger cannot charge from both sources at the same time. It switches automatically to the other source when the input voltage of the current source drops below its default threshold, so charging keeps going.
Solar input accepts 10V to 30V DC. Renogy lists MPPT efficiency above 99% and charging efficiency of 93%, with a maximum output current of 40A and output power of 616W.
Choose AGM/Sealed, Gel, Flooded or LiFePO4 with the SELECT button. LEDs show the type you have chosen. The charger can also revive a lithium battery that has dropped to a low voltage.
Traditional alternators with 13.2 to 16 VDC output and smart alternators (Euro 6, 12 to 16 VDC) are both supported. For a smart alternator, connect the IGN cable, labeled ACC, to the vehicle ignition port.
Renogy lists input and output reverse polarity, input and output over-voltage, over-temperature, overcharging, over-discharging and charging timeout protection. It also lists BMS protection for LFP batteries.
The charger weighs 2.65 lb and is small enough to fit behind a seat or in a trunk. A heat sink handles cooling.
RVs. Charge the house battery from the engine while driving, or from rooftop solar when parked.
SUVs and overland rigs. Keep an auxiliary battery topped off from the vehicle or from a roof panel.
Boats. Renogy lists marine use, charging from the engine battery or solar.
This charger uses one input at a time. Renogy's 30A and 50A chargers can charge from solar and the alternator at the same time. Choose this one if you only need either source at a given moment.
A basic isolator only joins batteries. This charger adds multi-stage charging, MPPT solar input and a battery-type setting.
Renogy's spec table lists a 60A input fuse rating and a 50A output fuse rating. Solar input must stay within 10V to 30V DC. The charger works from a 12V system with 10V to 16V output.
The enclosure rating is IP31. Operating temperature is -4°F to 113°F (-20°C to 45°C), and storage temperature is -4°F to 140°F (-20°C to 60°C). Renogy says the cables are labeled, so match each one to its label when you wire the charger.
No. This charger uses one input at a time. Renogy's 30A and 50A models are the ones that charge from both together.
The charger defaults to DC charging. Press the SELECT button on the side to give solar priority. Press it again to return to DC priority.
With the engine running, it switches from DC to solar when the DC input is below 11.3V and solar input is above 13V. With the engine off, it switches to solar when the DC input is below 12.7V and solar input is above 13V.
Yes. Connect the IGN cable, labeled ACC, to the vehicle ignition port.
The Renogy 40A DC-DC Battery Charger with MPPT keeps your 12V battery charged from the road or from the sun. If you have questions about your setup, the Outbound Power team is happy to help.
Renogy 40A DC-DC Battery Charger with MPPT Specifications |
|
|---|---|
| Input | |
| System Voltage | 12V to 12V |
| Solar Input Voltage | 10 ~ 30 VDC |
| Alternator Input | Traditional alternator 13.2 ~ 16.0 VDC; smart alternator (Euro 6) 12 ~ 16.0 VDC |
| Input Fuse Rating | 60 A |
| Output | |
| Maximum Output Current | 40 A |
| Output Voltage | 10 ~ 16 VDC |
| Output Power | 616 W |
| Output Fuse Rating | 50 A |
| Charging | |
| Battery Types | AGM, Gel, Flooded, Lithium iron phosphate |
| Charging Efficiency | 93% |
| MPPT Efficiency | Above 99% |
| Idle Power Consumption | Under 10 mA |
| Charging Sources | One at a time (DC input default, solar priority selectable) |
| Protection | |
| Protections | Input and output reverse polarity, input and output over-voltage, over-temperature, overcharging, over-discharging, charging timeout, BMS protection (LFP) |
| Enclosure Rating | IP31 |
| Size and Weight | |
| Model | RBC40D1S |
| Dimensions | 7.68 x 5.87 x 1.89 in / 195 x 149 x 48 mm |
| Weight | 2.65 lb / 1.2 kg |
| Grounding | Common negative |
| Cooling | Heat sink |
| Operating Temperature | -4°F ~ 113°F / -20°C ~ 45°C |
| Storage Temperature | -4°F ~ 140°F / -20°C ~ 60°C |
| Humidity | 0 ~ 90% RH |
| Certifications | FCC Part 15 Class B, CE, RoHS, SAA |
| Warranty | |
| Material and Workmanship Warranty | 2 years |
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