20A PWM Dual-Battery Solar Charge Controller 12V/24V | 4Boats

20 A PWM dual-battery solar charge controller for 12 V/24 V systems — ideal for caravans, campervans, boats and other dual-battery installations.

• Rated charging current: 20 A. Supports solar panels up to 320W (12 V) / 640W (24 V).
• Fully automated operation with automatic 12/24 V selection and configurable battery prioritisation (for example 80%/20%); automatically diverts current when one battery is fully charged.
• PWM (Pulse Width Modulation) charging to improve charge acceptance and extend battery life; selectable battery types: sealed, gel, flooded.
• Protections include reverse-current prevention (stops battery discharge to panel at night), overcharge protection, short-circuit protection and reverse polarity protection.
• Built-in temperature sensor with temperature compensation; external remote temperature sensor with 3 m cable recommended for installations where the controller is remote from the battery.
• RJ-45 socket for optional remote LCD meter (10 m cable) and LED status indicators for easy monitoring.
• Self-consumption: 4 mA at night, 10 mA when charging. Working temperature: -35°C to +55°C (-31°F to +131°F).
• Terminals for wire up to 4.0 mm² (12 AWG). Size: 15.5 x 7.6 x 4.0 cm (6.1 x 3.0 x 1.6 in). Weight: 230 g (0.51 lb). Multiple mounting holes for ease of installation; product includes a detailed instruction manual explaining connections.

The unit will operate with a single battery (auto-detects and supplies 100% charging current) and a second battery can be added later. Suitable for engine/leisure battery setups and other dual-battery arrangements.