Solartronics FS2000 - The Inverter in Combination with Other AC Power Supplies

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4.4 The inverter in combination with other AC power supplies
In many situations it is desirable that the equipment will work on the mains supply (or
generator) when this is available. The inverter and mains supply (or generator) then become one
circuit. Pay attention to the following:
Important
At the presence of a second power supply (mains, generator) this 110/230VAC will be parallel
on the output of the inverter. This will damage the inverter heavily!. The repair costs are not
covered by warranty. If you want the equipment to work on both an inverter and a second power
source, then mount the power transfer switch. Important feature is that this power transfer
switch is bipolar.
The power transfer box takes care of automatic switch between the two 110/230VAC circuits,
without any intervention for the connected equipment. A back-up system also can be created this
way.