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Without a charge controller a solar module can overcharge and ruin a battery. Charge controllers are also a relatively inexpensive component of an overall system. In some cases if your battery is large and your solar module is small you do not need a charge controller. How do I know if I need a charge controller? A general guideline to follow is you don't need a charge controller unless you have more than five watts of solar for every 100-amp hours of battery capacity. For a system with less than 5 watts for every 100-amp hour battery, the PV panel size system would be considered a “trickle-charge” -meaning the panel is merely replacing the charge that is naturally being lost from the battery. Manufacturers
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