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To: Tell It Right

Do you backup with batteries?


48 posted on 09/08/2021 12:03:30 PM PDT by wgmalabama (We will find out if the Vac or virus risk was the correct choice - can we put truth above narrative)
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To: wgmalabama; Dr. Sivana
"Do you backup with batteries?"

Yes. And "backup" is probably an oversimplification. On a cloudy day my 10kW system can go from producing 9kW to 3kW a few minutes later, and back up to 8 or 9kW a few minutes after that. If my A/C is running I might be consuming 5kW (including incidentals like clocks and dehumidifier, etc.) fairly constantly while the A/C is running. So my battery "backup" is being called on for only a few minutes while a cloud is over my house, then charged back up when the cloud is gone a few minutes later. Then of course after the sun goes down my battery is my "backup" until it drains. I have it set to stop draining from the batteries when the battery charge gets to 30% (20% is the ultimate line for my warranty, but I set it at 30% to hopefully give me past my 2,000 guaranteed discharges, which is over 19 years). Given that I use only 70% of my batteries' capacity, count it as me having 21kWh of usable backup.

During the summer I usually don't have enough battery backup power to last through the night (because my A/C consumes so much). But over half the days during the spring are days I hardly pull from the grid.

52 posted on 09/08/2021 12:25:18 PM PDT by Tell It Right (1st Thessalonians 5:21 -- Put everything to the test, hold fast to that which is true.)
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