1)For non-solar-powered household circuits: An electrician with a professional technician certificate is required to install the in-grid power system, connect the wires of critical equipment from your main electrical box to the BLUETTI UPS BOX. When the power fails, it will automatically switch to EP500 or EP500 Pro for the power supply. The connection method: power grid--home main circuit--BLUETTI UPS box--EP500 or EP500Pro--critical equipment (such as refrigerator, electric light, and server).
2)Solar-powered UPS: 1.If the open-circuit voltage of the solar panels is within the specified input range of EP500, they can be directly connected into EP500 or EP500Pro through the MC4 port connectors to build up the UPS system. 2.If the open-circuit voltage of your panels exceeds the input limitation of EP500 or EP500Pro, they need to pass the "PV step-down module" to decrease the voltage before connecting into the system. The connection method is solar panels--PV step-down module--EP500 or EP500Pro--critical equipment (such as refrigerator, electric light, and server).