Solar charge controllers monitor the condition of your battery and control the charge rate. They play an important role in prolonging the life of your solar batteries by protecting batteries from being overcharged or from being completely discharged, both of which significantly reduce battery lifespan.
In addition to having a built-in USB port for powering or charging external USB devices, these solar charge controllers include a number of important features:
Suitable for 12 or 24VDC systems (auto-sensing)
Suitable for SLA/GEL/FLD/Li batteries