Yes, but, some of us do have an interest in backup power at cheaper cost. If in fact the 52kwh super-cap was $3200 and moving towards $2100, then it would be a lot less expensive than the $4000 or so that I paid for a 17kwh backup battery bank
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It would mean I could have all the power I wanted, any time I wanted, when the grid was down.
R
If these live up to the promises, they will make good local backup systems. But don't forget that the electronics may be considerably more expensive. Theses super-caps get charged up to thousands of volts, and then all the way down to zero. That is an extremely wide range to design for. Components are much different from systems in the 10's to 100's of volts.
Batteries on the other hand, only vary by about 30% in voltage from full charge to fully discharged. It's much simpler/cheaper to design an inverter to run efficiently over the range of 14V down to 11 Volts than from 3,500V to zero.
Can you tell me how long 52kwh would last in a 'normal' situation? Also in a hot summer time?
I think that for the winter months I do not use that amount.... but in the summer I can be in the 1200 to 2000 range... air conditioning is a killer....
The interesting part is that if they do actually start to charge based on when you use electricity, then actually having someplace to easily store what you need when it is cheap and not pay the high price would be great.. I would cough up $2100 if I could cut my bills down by a big amount..
Is that 1200 to 2000 in dollars? Per month?
My total utility bills (heat and A/C) aren't much more for an entire year. First thing I'd look at is eff AC and insulation/shade. Conservation is still the cheapest route in most cases.
52KWhrs would run a 220V AC that draws 20 Amps (4.4KW/Hr) for 11.8 hours (ignoring efficiencies). I don't know that off peak rates would be low enough to pay for storing it though. Some places do it today, I don't think it is that huge a delta.
here's the first I googled:
Time of Day
For electricity used during the peak periods of 6:30-9:30 AM and 5:30-8:30 PM the rate is $.1525 per kilowatt hour. For all other times of the day, the off-peak times, the rate is $.038 per kilowatt hour. Compare that to the regular monthly rate of $.072 per kilowatt hour.
So, you can go from a 7.2 cents to 3.8 cents off peak, and only need about 3 hours storage - but watch those peak rates of 15.25!
Another local storage system technology that is here today is flywheels. A company makes these about the size of a 55 Gallon drum. Spin 'em up during off-peak, tap the power at peak. Probably not cost effective - they are used to back up mission critical stuff.
'Funny' thing is, storing peak electricity would actually cause us to waste electricity (and the fossil fuel to generate it). Peak is expensive for the electric companies, because they need to design the size of plants and the grid to handle just those few hours, but storing it always will waste some of it in conversion loss, so overall usage will go up.
-ERD50