Solar Charge Controller for 12V and 24V Systems A compact, robust solar controller designed for direct PV panel connection and reliable battery management. Available in 70A, 80A, and 100A models to match different system sizes. Key features and benefits Automatic 12V/24V detection: Recognizes system voltage on first installation when the battery has sufficient voltage, simplifying setup. current options: Choose 70A, 80A, or 100A depending on panel and battery capacity for flexible system sizing. USB output: 5V USB port for powering or charging small devices directly from the controller. Direct PV drive and simple connection: DC5521 interface plugs directly into the controller to reduce wiring work and installation time. Broad operating range: Designed to work in temperatures from 35C to +60C for use in varied climates. Durable, lightweight construction: ABS housing and a compact form factor at approximately 120g (4.2oz) make installation easy and space efficient. Comprehensive protections: Builtin safeguards for reverse discharge, undervoltage, reverse connection, overload, short circuit, and accumulated discharge time to protect battery and system components. What this controller solves Prevents battery damage by managing charge and discharge conditions and by protecting against common wiring faults. Reduces installation complexity with direct connector access and automatic voltage detection. Gives reliable USB output for small electronics when offgrid or during power interruptions. Important usage notes This controller autoadapts to 12V and 24V systems. On first installation, ensure the battery has enough voltage so the controller can correctly detect the system voltage. Install the controller as close to the battery as possible to minimize voltage drop that can affect voltage sensing. Applicable to various leadacid battery types including open, sealed, and gel batteries. Do not use this controller for lithium, NiMH, or other unsupported battery chemistries. Use photovoltaic panels as the charging source only. Do not use other DC sources as substitutes for PV input. The unit will get warm during operation. Mount on a flat, well ventilated surface to allow heat dissipation. Typical applications Caravan or RV leadacid house battery management: Connect solar panels to maintain a 12V or 24V leadacid battery bank and provide a 5V USB charging point for small devices. Offgrid weekend cabin or shed: Charge sealed or gel batteries from PV panels and protect the battery from overdischarge and wiring faults. Small solarpowered equipment and lighting: Direct drive from PV panels to the controller for battery charging and protected power delivery to lowvoltage loads. Package contents 1 x Solar Controller 1 x Manual Technical summary Item type: Solar Controller Material: ABS Weight: Approx. 120g / 4.2oz USB output: 5V Available current ratings: 70A, 80A, 100A Output mode: USB Operating temperature: 35C to +60C Scope of application: Solar panels and related PV systems Interface: DC5521 direct access Protections: Reverse discharge, undervoltage, reverse connection, overload, short circuit, and discharge hours accumulation This controller provides a straightforward, protected way to manage solar charging for 12V and 24V leadacid systems while offering a convenient USB output and simplified installation.