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Sep 14, 2023

Enphase prepping commercial inverters and a small

Grid isolation is the problem and can be addressed in many different ways. One of the most expensive ESS, the Sonnen ecolinx can be set up as a smart system, using an onboard Radian 48VDC inverter to

Grid isolation is the problem and can be addressed in many different ways. One of the most expensive ESS, the Sonnen ecolinx can be set up as a smart system, using an onboard Radian 48VDC inverter to feed smart circuit breaker circuits that could be isolated from the grid to power some critical home circuits for hours or days with solar PV panels powering the critical circuits.

The down side is a lot of systems are set up string panels with a DC buss voltage of 300 to 400VDC into a house inverter that is grid tied. The grid tied equipment will shut down when the grid fails. At this time I only know of two battery packs that can be used in a “high voltage” DC buss. TESLA and LG Chem can address a buss in the ‘nominal’ 350VDC range. A lot of the other ESS out there are based on 48VDC. It is the Kludged together solar PV system the owner thinks they’re getting that will be a maintenance nightmare when things go wrong. There is only one inverter system that can be set up for grid tied, grid tied battery backup, or as battery backed off grid with the same inverter unit. The Schneider XW6048 can do all three with the (proper) programming and electrical isolation techniques. Another technique is to break out solar PV panels and connect to a stand alone off grid battery backed system that feeds a secondary critical circuit house panel. The critical circuit panel will be powered off of the solar PV, battery, inverter all of the time. (IF) the off grid system fails or needs maintenance a break before make transfer switch could bridge the primary/secondary C.B. panels to run on grid power.