Tedx wrote:I've just had a quote in from my energy provider for solar panels/battery. What do others think?
Grade A Tier1 Monocrystalline / 8 panels / 3.04kw / inc fitting / inc invertor.......£6,730
Estimated annual export:94kWh
Your estimated export income:£14
I'm all electric on Economy 7. Pretty sure the consultant said the battery would charge off night time elecricity if the solar panels didnt charge it up (this would be handy to me in the winter time)
Seems expensive to me. What do others think?
The export is a spurious figure, really depends on your usage profile and tariff. What is important is the generation. Our 10 panel East/3 panel West generated 390kWh/125 export in Aug, 275/136 Sept when we went away and used nothing for a few days, then , 130/40, and 42/3kWh this month.
As shown, the battery cost takes ages to recoup IF you have a decent export rate like Octopus' 15p or so per kWh. The battery saving is import cost - export cost (or off peak charge cost as you can set them to charge from mains at certain periods). At the moment you'll generate next to nowt so if you're paying 10p/kWh economy7 your 5kWh battery will save you about 75p/night. In summer it 'buffers' the solar, and you can save a bit more, perhaps as much as a quid per day.
Battery and panel costs have come down the last 6 months, a Huawei 5kWh battery with management unit is £3500 cf £5k in Summer. There are other cheaper brands out there, 10kWh can be had for about £4k.
Depending upon where you are, the cost isn't excessive. We paid £10.5K in July in Shropshire for 5.2kW panels (13 x 400W) and a 5kWh battery. We have a 6kW inverter as we're adding more panels once the builders put the house roof back. However we didn't need any scaffolding for installation as it was on a garage and was a simple 1.5 day job. Do you need scaff? - that can easily add a grand or 2 to the job, which is not dissimilar to the cost of 5 panels. We have optimisers on all our panels, seems to be a pretty standard thing.
Battery is VAT free as part of a solar install, but you pay VAT if you add it later.
If you just want to look at it from a financial side, maximise the panels and forget the battery.
Tedx wrote:Estimated annual consumption: 7197
Estimated annual generation: 2437
Thise seem low if you're using elec for everything - I guess your bill will tell you that. I'd also expect more generation if your panels are South/SE facing.