Critcal load battery backup instead of generator
I am installing a new project for a client, Instead of using a generator for a power source it will be a 3 day atonomy battery bank. I will be using a Outback VFX3648 inverter/charger/transfer switch that's right it does it all. I will bring the critical loads from the main breaker to a 100Amp sub panel, to an AC disconnect to the Outback VFX3648 to the battery bank. Has anyone done a system like this before? The power here only goes out possibly once a year for no more than six hours, I was going to use a generator but the grants do not allow it. So the main idea is when the power goes out the Outback will transfer power to the battery bank and power the critical loads only without back feeding into the grid and harming utility workers, so it works like an off-grid system without an RE source. On the side we did install two 10kW bergey grid-tie to the property.
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