20A 12V DC-to-DC Battery-to-Battery Charger with Solar Input | 4Boats

Automatic 20 A 12 V DC-to-DC battery-to-battery charger with built‑in solar input, multi‑stage charging and selectable modes for Lead‑acid, AGM/Gel, Calcium or Lithium‑ion batteries.

• Calcium or Lithium-ion Batteries Function: This powerful, high-quality battery-to-battery charger can charge a 12 V battery from another 12 V battery or from a solar panel; up to 20 A charging current.
• Powerful solar charge controller with overload protection: compatible with solar panels 16.0–25.0 V, maximum solar input 20 A; automatically activates when no battery-to-battery charging is present.
• Fully automatic high-frequency multi-stage charging: bulk, absorption and float stages with pulsed charging to keep temperatures low and extend battery life.
• Easy battery-type selection: push-button switching between Lead Acid, AGM/Gel, Calcium or Lithium‑ion; unit remembers the selected battery type even without power.
• Safe unattended charging: built-in protections against overload, overheating, overvoltage, over-discharge, short circuit and reverse discharge so it can be left permanently connected.
• Continued charging during battery/load use and ignition on/off control: can be set to begin battery-to-battery charging when ignition is on and stop when ignition is off.
• Deep-discharge recovery: soft-start charging programme and a minimum output battery voltage of only 2.0 V to recover batteries with a high depth of discharge.
• Additional features: LED indicators show target charging stage and selected battery type; compatible with any 12 V lead‑acid, AGM, Gel, Calcium or Li‑ion battery; user manual included for wiring and installation.
• Specifications: Battery input voltage 12.5–16.0 V; maximum charging current 20 A; solar input voltage 16.0–25.0 V; maximum solar input current 20 A; bulk charge voltage 14.3 V (AGM/Gel), 14.0 V (Lead Acid), 15.0 V (Calcium), 14.0 V (Li‑ion); float charge voltage 13.5 V; float charge current 100 mA; battery capacity 18–250 Ah; minimum output voltage 2.0 V; dimensions 21 x 13 x 4 cm (8.3 x 5.1 x 1.6 in); weight 900 g (2.0 lb); 1 year manufacturer warranty.

Suitable for caravans, motorhomes and boats to share alternator charging and extend off‑grid runtime via solar. Follow the supplied user manual for correct wiring and safe installation.

Automatic 20 A 12 V DC-to-DC battery-to-battery charger with built‑in solar input, multi‑stage charging and selectable modes for Lead‑acid, AGM/Gel, Calcium or Lithium‑ion batteries.

• Calcium or Lithium-ion Batteries Function: This powerful, high-quality battery-to-battery charger can charge a 12 V battery from another 12 V battery or from a solar panel; up to 20 A charging current.
• Powerful solar charge controller with overload protection: compatible with solar panels 16.0–25.0 V, maximum solar input 20 A; automatically activates when no battery-to-battery charging is present.
• Fully automatic high-frequency multi-stage charging: bulk, absorption and float stages with pulsed charging to keep temperatures low and extend battery life.
• Easy battery-type selection: push-button switching between Lead Acid, AGM/Gel, Calcium or Lithium‑ion; unit remembers the selected battery type even without power.
• Safe unattended charging: built-in protections against overload, overheating, overvoltage, over-discharge, short circuit and reverse discharge so it can be left permanently connected.
• Continued charging during battery/load use and ignition on/off control: can be set to begin battery-to-battery charging when ignition is on and stop when ignition is off.
• Deep-discharge recovery: soft-start charging programme and a minimum output battery voltage of only 2.0 V to recover batteries with a high depth of discharge.
• Additional features: LED indicators show target charging stage and selected battery type; compatible with any 12 V lead‑acid, AGM, Gel, Calcium or Li‑ion battery; user manual included for wiring and installation.
• Specifications: Battery input voltage 12.5–16.0 V; maximum charging current 20 A; solar input voltage 16.0–25.0 V; maximum solar input current 20 A; bulk charge voltage 14.3 V (AGM/Gel), 14.0 V (Lead Acid), 15.0 V (Calcium), 14.0 V (Li‑ion); float charge voltage 13.5 V; float charge current 100 mA; battery capacity 18–250 Ah; minimum output voltage 2.0 V; dimensions 21 x 13 x 4 cm (8.3 x 5.1 x 1.6 in); weight 900 g (2.0 lb); 1 year manufacturer warranty.

Suitable for caravans, motorhomes and boats to share alternator charging and extend off‑grid runtime via solar. Follow the supplied user manual for correct wiring and safe installation.