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. Standard solar charge controllers connects the solar panels directly to the battery bank making them upto 30% less efficient compared to their MPPT counter parts. Maximum Power Point Tracking (MPPT) controllers have a advanced micro controller based design to dynamically track the output power of the solar panel(s) to always harness the most power possible. Standard controllers cost less, but lacks efficiency and is therefore used in smaller setups. MPPT controllers become the cost effective option when the number of panels increase. Remember to take into account any future additions to the system such that the charge controller will have sufficient capacity to handle the added load.