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Protection of life of your inverter battery is very important as it is so expensive, even about two times what it cost you to build an inverter. So designing and building an inverter without adequate measure for protecting the life of the battery will make one lose greatly. This lead to introduction of a feature called low battery shutdown into my power inverter circuit. This circuit protects your battery from danger of over-discharge. Battery level is measured by voltage divider circuit of R17 and VR2 which send measured voltage to IC1, a comparator. The voltage is processed by the comparator and output (0 or 1 as the case may be) is sent to IC2 which determine either to send shutdown signal to IC4. Signal sent by IC2 is determined by signal received from battery level circuit sensor (i.e, voltage divider and IC1).
When '1' is received by IC2, '1' is sent to pin10 of SG3524; this disables pulse generator circuit and the inverter as a whole. It obvious that battery voltage will tend to jump up when the system is shutdown by low battery shutdown circuit, but the circuit will not honour this false rise in battery voltage and the inverter remains down until reset switch is pressed.
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Power inverter circuit with Low battery shutdown1
Power inverter circuit with low battery shutdown2