Thank You for your reply

Computer UPS is OK.

We discussed this matter to him and he told Invertor is just one and a half years old and it is digital. So hope it is ok. Computer UPS   Not required if it is digital. We need two items optional one is viewing Screen and the Second one is surge Protector. Surge Protector prevents overvolt and surge. The device and equipment are in your home protects. Another optional one is Motion sensors that trigger the lights that make the intruder panic and divert his attention. At the same time very useful for others and save energy

a surge protector or surge suppressor is an appliance or device designed to protect electrical devices from voltage spikes. A surge protector attempts to limit the voltage supplied to an electric device by either blocking or shorting to ground any unwanted voltages above a safe threshold.

Why do we use surge protectors?

Microprocessors, which are an integral part of all computers as well as many home appliances, are particularly sensitive to surges. ... You should definitely use a surge protector with your computer, CCTV, Access Control System, LED TV Data Networks, LED Bulbs, and many items. It is filled with voltage-sensitive components that a power surge could damage very easily

This PIR sensor can be used to replace a wall light switch to save energy when rooms are unoccupied. ... If the sensor detects movement during the on period it resets the time period - in short if someone is moving in the space the unit keeps the lights