1 / 10Rich Solar 12V 20A 40A 60A DC to DC Battery Charger for RV, Van, Boat, Off-Grid | Lithium & Lead-ACid Batteries
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Rich Solar 12V 20A / 40A / 60A DC-DC Battery Charger
Choose the right alternator charging speed for your RV, camper van, boat, work vehicle, trailer, or mobile off-grid setup. The Rich Solar 12V DC-DC charger lineup combines battery isolation and controlled alternator charging in one compact unit, with 20A, 40A, and 60A options for different battery banks, alternator sizes, and travel-power needs.
Product Overview
A DC-DC battery charger lets a vehicle alternator charge a separate auxiliary or house battery while the engine is running. That makes it one of the most useful upgrades for mobile power systems because it can recharge the battery bank while driving, even when solar production is low or shore power is not available.
This lineup is built for 12V mobile systems and supports AGM, Flooded, Gel, Sealed, LiFePO4, and Lithium-ion batteries through the mode-selection switch. It is ideal for RV house batteries, van conversion power systems, boat auxiliary batteries, work vans, expedition rigs, and off-grid vehicles that need reliable charging on the road.
Pick Your Charging Speed
Use the selector below as a quick buying guide. The 20A model is better for lighter systems, the 40A model is the balanced middle option, and the 60A model is built for larger battery banks and stronger alternator setups.
RS-DC20 — 20A DC-DC Charger
The 20A model is the easiest fit for smaller vehicles, smaller battery banks, compact vans, light RV systems, and setups where alternator demand needs to stay lower.
RS-DC40 — 40A DC-DC Charger
The 40A model is the sweet spot for many RV, camper van, boat, and service-vehicle systems. It charges faster than the 20A unit without jumping straight to the higher draw of the 60A model.
RS-DC60 — 60A DC-DC Charger
The 60A model is built for larger house batteries, larger RVs, bigger van builds, commercial vehicles, and mobile off-grid systems where faster driving-based charging is the priority.
What It Does in Your System
This charger sits between the vehicle starter battery and the auxiliary house battery. When the engine is running, it converts alternator power into controlled charging for the house battery. When the vehicle is off, battery isolation helps stop reverse current between the starter and auxiliary batteries.
Turn drive time into battery charging time. This is especially helpful for van life, boondocking, marine trips, service vehicles, and off-grid travel where solar alone may not keep up.
The interface includes battery type selection, D+ ignition control, LC low-current mode, sensor input, DC input, and DC output connections in one organized terminal layout.
Charge Smarter, Protect the Batteries
The charger lineup supports different battery types and charging behavior. Lithium batteries use a 2-stage charging profile that can help reactivate over-discharged lithium batteries and charge to full. Lead-acid batteries use a 3-stage profile designed for AGM, Flooded, Gel, and Sealed batteries.
Use the battery mode selector to match the charger to the battery type. This keeps the charging behavior aligned with the battery instead of treating every house battery the same.
Smart circuit protection helps guard against over-voltage, under-voltage, over-temperature, reverse polarity, and short-circuit conditions during proper use.
Designed for Real Mobile Power Setups
This is the type of charger customers add when they want their vehicle to actively support the house battery system. It is especially useful when there is not enough roof space for solar, the customer drives often, or the system needs more than solar-only charging.
Recharge house batteries while driving between campsites, shore power stops, or boondocking locations.
Ideal for van conversions where alternator charging can back up solar and help keep lithium batteries topped off.
Useful for properly designed marine systems that need auxiliary battery charging and starter-battery separation.
Helpful for mobile and remote power systems where alternator charging supports a larger off-grid battery setup.
Model Comparison
Compare the 20A, 40A, and 60A variants below. The right choice depends on how fast the customer wants to recharge, how large the house battery bank is, and how much current the vehicle’s alternator and wiring can safely support.
| Spec | 20A Model | 40A Model | 60A Model |
|---|---|---|---|
| Model | RS-DC20 | RS-DC40 | RS-DC60 |
| Product Name | 20A Battery Charger | 40A Battery Charger | 60A Battery Charger |
| Input Nominal Voltage | 12VDC | 12VDC | 12VDC |
| Operating Voltage Range | 10–16VDC | 10–16VDC | 10–16VDC |
| Output Nominal Power | 250W | 500W | 750W |
| Output Nominal Current | 20A | 40A | 60A |
| Operating Current Range | 18–22A | 37–43A | 55–65A |
| Weight | 4.0 lb | 4.9 lb | 6.2 lb |
| Dimensions | 8.4 × 7.4 × 3.1 in | 10.3 × 7.4 × 3.1 in | 12.3 × 7.4 × 3.1 in |
| Efficiency | >85% @ 14VDC, 30% load | >85% @ 14VDC, 30% load | >85% @ 14VDC, 30% load |
| Battery Charging Mode | 2-stage lithium; 3-stage lead-acid | 2-stage lithium; 3-stage lead-acid | 2-stage lithium; 3-stage lead-acid |
Key Features
Best Uses
- Camper van auxiliary battery charging
- RV and motorhome house battery systems
- Boat and compatible marine battery systems
- Commercial vehicle and service van power systems
- Trailer and expedition vehicle electrical builds
- Charging LiFePO4 batteries from an alternator
- Charging AGM, Flooded, Gel, or Sealed lead-acid batteries
- Mobile systems with limited solar roof space
- Customers who want charging while driving
Key Benefits
- Available in 20A, 40A, and 60A models
- 12VDC input for vehicle-based charging systems
- 250W, 500W, or 750W nominal output power depending on model
- Supports AGM, Flooded, Gel, Sealed, LiFePO4, and Lithium-ion 12V batteries
- 2-stage charging for lithium batteries
- 3-stage charging for lead-acid batteries
- Mode-selection switch for battery type
- Built-in battery isolation
- D+ ignition charging control
- LC low-current mode
- RJ11 sensor port for lead-acid temperature-adaptive charging
- Over-voltage, under-voltage, over-temperature, reverse polarity, and short-circuit protection
- Integrated cooling fans and rugged metal enclosure
- CE and RoHS listed certifications
Quick Answers
Is this a solar charge controller?
No. This is a DC-DC battery charger for alternator-to-house-battery charging. Solar panels still need a solar charge controller.
Which model should customers choose?
Choose 20A for smaller systems, 40A for a balanced mid-size setup, and 60A for larger battery banks that can accept higher charging current from a properly sized alternator and wiring setup.
Does it charge lithium batteries?
Yes. The lineup supports LiFePO4 and Lithium-ion 12V batteries, along with AGM, Flooded, Gel, and Sealed lead-acid batteries.
Are D+, LC, and temperature sensor cables included?
The product page notes that D+, LC cables, and the temperature sensor are not included.
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