The EFOY Pro connects directly to the battery. Its integrated voltage regulator monitors the battery continually. If voltage dips below a preset value, the EFOY Pro automatically recharges the battery to a predetermined level. It then reverts to standby mode.

Batteries never died. Battery life is prolonged because exhaustive discharges are a thing of the past.

The EFOY Pro can also work as a hybrid with a solar system. It only clicks in if the solar module can no longer produce enough electricity.