Soldato
- Joined
- 23 May 2006
- Posts
- 7,226
sorry to jump in but out of curiosity why do you think the battery will only last 7-10 years?How many panels do you have for the 4.7kW array?
I had some JA Solar panels and a Growatt inverter, seems to have done the job pretty well to be honest over the time they've been installed I'd hate to think how much less I'd have used electric without the panels I've had installed. Kinda a scary thought really.
What made you go for the battery out of interest? When I was looking at them about 5 years ago, I couldn't warrant one because I used less power over night (aside from when I left things running over night etc.) but generally from when the solar shuts off to when it kicks in in the morning again, 2 to 5 units of electric seemed a bit much to try and save with a battery that would only last about 7 to 10 years (I think might have been even 8 years at the time, maybe less) so to break even would have been difficult..
an electric car battery is very similar construction (some house batteries are actually old car batteries) . a car battery is expected to last far beyond 10 years and the battery in a car gets a far far harder life than a house one.
our house battery (3x 2.4kw pylons) comes with a 5 year manufacturer one, with an extra 5 years on top by the installer so 10 years total but I am expected 15 years minimum out of it. iirc it cost around...... £2200 I think .
my whole system cost £8300 and that included £500 of bird proofing (that was the most expensive chicken wire inever bought) ,. 15x 340w panels and a solis power inverter. 2 strings as 10 panels on my east roof and 5 on my west (I have an extension on my west roof - even so we could have fitted an extra 2 panels on it and am dissapointed we didn't.
currently my system is 13 months old and it has operated fantastically. the battery to me is as important as the panels.
long term I don't think house batteries will be essential as electric cars start to support V2G (or for me more importantly V2P) (vehicle to premises) but until then home batteries are great.