Hi, is the circuit breaker button like one in a DB for example? I have the Mercer 1200VA inverter. The battery only last an hour if we are lucky. Only 1 tv with the DSTV connected. Is the CB Button suppose to be clicking or hard to press in. At the moment nothing happens when I press it. How do you check the output (what rype of meter)? We purchased the Inverter in December 2022. Thank you