A dual battery solar charge controller can provide following 3 functions : These are specific to models (MPPT5012A-DUO & MPPT5025A-DUO) available from www.zhcsolar.com. 1. As compared to conventional or standard charge controllers, this controller has higher MPP charging current by 10-30%. This makes it more efficient compared Dual Solar Charge Controller from to the standard charge www.zhcsolar.com controller with efficiency greater than 95%. 2. Different types of batteries can be charged via these dual charge controllers by switch board lines. These can be configured for batteries like dryfit, gel, fleece, acid/lead-acid batteries etc. Battery type selection4: Mostly flooded type or sealed type lead acid batteries are used with solar energy systems. Sealed batteries are regulated at lower voltage than flooded batteries or they can dry out. Charge controllers like referenced above have the ability to select type of batteries to be charged and can be managed efficiently. 3. There are two battery charging ports on this charge controller with automatic charging of the main battery and support charging for the secondary battery with overcharge protection. 4. This charge controller provides protection against overload, overheating, reverse battery and back discharge from battery. So there is no need to attend charging batteries while it is in progress. Reverse current blocking4: Solar panels send current in one direction when working in full sunlight. At night slight current is reversed which can cause discharge from battery. A charge controller has a semiconductor or a transistor which makes current to flow in only one direction and blocks reverse current. Disconnection at low voltage4: Deep cycle batteries if discharged to 100%, they can be ruined. Usually these batteries discharge till 80% of their capacity and 20% of charge is kept in the battery for optimal working. A low voltage disconnect circuit breaker in charge controller disconnects the load from the batteries and is a very important function. Protection from overload4: If current flowing in a circuit is higher than it can safely handle, this causes overload which can be hazardous. Charge controllers have overload protection installed, which disconnects battery from the load in such a condition.
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https://zhcsolar.com/wp-content/uploads/2019/01/MPPT5012_25A-DUO-User-Manua.pdf 4 http://www.arizonaenergy.org/AltEnergyClub/WhatIsAChargeController.pdf
