Rich Solar Renogy 20A DC DC Battery Charger For RVs And Boats

12V Smart Multi-Stage Battery Charger — 20A / 250W

This compact 12V charger provides intelligent, multi-stage charging and battery protection for RVs, vans, boats, and off-grid systems. It supports common battery types, wakes over-discharged lithium cells, and offers control inputs to match alternators and operating conditions — all in a small, efficient package.

Benefits

• Keep auxiliary batteries ready so you have reliable power for appliances and electronics when you need them.
• Protect your starter and house batteries automatically, reducing the risk of breakdowns and costly replacements.
• Reduce the time spent managing charging settings by using automatic multi-stage profiles tailored to battery chemistry.
• Charge safely from small or older alternators using a low-current mode, avoiding alternator strain and overheating.
• Extend battery life by adjusting charging behavior for temperature and avoiding over-voltage or reverse-current scenarios.

Features

• Compatible with 12V AGM, flooded, gel, and lithium batteries for flexible use across vehicles and systems.
• Connects to the 12V starter battery and works with smart or traditional alternators.
• Smart charging profiles: 2-stage charging for lithium and 3-stage charging (Bulk ? Absorption ? Float) for lead-acid batteries.
• Lithium Battery Activation: automatically wakes over-discharged lithium batteries so they can accept charge again.
• Built-in protection against over-voltage, over-temperature, and reverse polarity to safeguard equipment and batteries.
• Battery isolation to prevent reverse current between batteries and protect the starter battery.
• D+ ignition terminal ensures charging only when the engine is running, protecting the starter battery.
• LC terminal enables a low-current (10A) mode for small alternators or weak power sources.
• RJ11 temperature sensor port adjusts charging voltage for hot or cold conditions (not used for lithium batteries).
• Note: D+, LC cables, and a temperature sensor are not included.

Specifications

• Output nominal power: 250 W
• Output nominal current: 20 A
• Operating current range: 18–22 A
• Low current mode: 10 A
• Floating charge current: 3–5 A
• Low current mode range: 8–11 A
• Quiescent current: < 0.45 A
• Ripple voltage: < 500 mV rms
• Battery charging mode: 3-stage type (for lead-acid)
• Efficiency: > 85% at 14 VDC, 30% load
• Input nominal voltage: 12 VDC
• Operating voltage range: 10–16 VDC
• Input current limit: ? 34 A
• Dimensions: 8.4 × 7.4 × 3.1 in (213 × 188 × 79 mm)
• Weight: 4.0 lb (1.8 kg)