Toshiba 1000 Series User Manual page 25

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An input filter reduces transients on the main supply.
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For maintaining full battery charge, AC-power is rectified and regulated in the
rectifier feeding power to the inverter and battery converter.
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DC power is converted to AC in the inverter and passes it on to the load.
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Power to the load is maintained from the battery during a power failure.
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The converter increases voltage for the inverter as required.
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