The way our industry now sizes these is to provide power in the event of utility loss to genset start-up. High load, short duration events.
A single 750 kVA rated flywheel will run a 20kW load for a little less than 10 minutes.
20kW is about 16 times the average customer load (1.25 kW or about 900 kWh/year). This would lead to about 2.7 hours without any generation or grid power. Night time usage is about half of daytime usage in a residential setting getting you to 5.4 hours usage. Parallel 2 flywheels and you've got enough stored energy to power an average electric customer through the night. With a little thinking and forethought you can reduce nighttime usage even more.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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