We have a new (for us) application for grid connected net-metered PV with battery back-up as follows. The twist is that the entire load center in the house will be the "protected loads panel".
- 5kW PV ground mount located 250 feet East of their barn. - Will utilize AC Coupled SB5000US inverter to (2)Sunny Island 5048's for 120/240VAC back-up capability with 24.5kWh back-up battery bank. All inverters/batteries to be located in barn. - Barn has 200A service from grid (PV system AC point of connection will be there), house is located 175 feet West of barn and has a 100A load center (sub panel from barn). - Intention is to back up house as the protected loads panel fed by the Sunny Islands in case of grid failure. - The Sunny Islands will be able to pass through up to 56 Amps at 240VAC. - I want to supply the 100A house load center with up to 100A during normal operation with grid available. I am proposing to use an automatic contactor/transfer switch to feed the 100A house load center. Normally Closed contacts from grid power, N.O. contacts fed by Sunny Island. Therefore normal operation will be for grid to be connected directly to house 100A load center and under grid failure the transfer switch will connect the Sunny Islands to power the 100A house load center. Under grid failure condition we will have an LED signal light come on to warn the homeowners that they are on battery power. Questions for wrenches: 1) Is that whole thing a viable idea? 2) 100 Amp automatic transfer switch recommendations? 3) LED signal light recommendations? Or is there another method to warn homeowner of grid down status? Thanks, Dave David Palumbo, NABCEP Certified PV Installer Independent Power LLC Offices in Lamoille and the Champlain Valley 802.888.7194 www.independentpowerllc.com
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