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How to attach Relay or any circuit to make Solar Inverter work as UPS

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I just purchased a new 2.5kW Solar inverter. It has following out put functions

  1. When Solar power is available it will give AC power from it if solar power is low it will get power from battery and fulfill the load requirement and it will not use the main govt supplied electricity.

How can make it work in a way that First when solar is available it will use it and may use battery to cover load but when Sun goes away house can be powered by Govt supplied Electricity and when this electricity goes off battery can give backup. Any diagram for rely implementation or any circuit module that can be used to make this happen?

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