Energy Price Cap announcement: Watch Martin Lewis explain what it means for your electricity and gas bills this winter
Should I bother with a battery?
edited 14 February 2022 at 4:37PM in Green & ethical MoneySaving
35 replies 1.4K views
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2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 2.5kw inverter. 29MWh generated, long-term average 2.6 Os.
V DC2 0230.4V
I DC2 0.0.9A
So yes, something wrong with the second string of 7 panels.
V DC1 0.001.4v
I DC1 00.1A
My own fault. On some level I registered the drop in FITS but was so pulled in all directions at the time it went out of my head. Kind of hoping this might be a simple thing, like a mouse chewed wire or something.
The latest price is 7.5p/30p for Go & it should reflect the prevailing market as it isn't capped.
Charging for 4 hours per night on Go will yield a discharge of 11.35kWh. The cost of that will be about 9p/kWh after factoring in round trip losses. The savings are therefore 11.35 x 21p (30p - 9p) = £2.38/day... or £870 pa.
The capital cost of the equipment required is;
6 x US2000C @ £720ea = £4320 (or 4 x US3000C @ £1020 = £4080)
Sofar ME3000 = £700 (?)
Installation = £350
ROI = is just under 6 years for the US3000C (£5130/£870)... & that's without factoring in any of the solar output you harvest!
Of course all this is dependant on energy prices remaining at 30p/kWh after April 1st & Octopus keeping the huge differential between the on & off peak Go tariff.