Solar PCU 2kVA – Gamma Solar PCU is a Solar Power Conditioning Unit (PCU) which uses Solar energy (primary) and also the power from the grid (secondary), to charge the batteries. Since the usage of power from the grid is secondary, grid power is only used when solar energy is not present and the battery voltage level reduces to a certain level. Grid power is also needed when solar power is reduced to a certain level and battery voltage is reduced to a certain level.