On-grid domestic battery storage

1961Nick

pcgtron said:

If they are vat registered, there is 1.3k of Vat on that price 

£5300 from this supplier.

 https://powerlandb2b.com/products/sunsynk-byd-battery-lfp-5-12kwh-wall-mounted?currency=GBP&variant=43702448455990&utm_medium=cpc&utm_source=google&utm_campaign=Google Shopping&gclid=CjwKCAiA2fmdBhBpEiwA4CcHzRg6Lw6LxhEbGmTo_XgNKwPThKZQHvDu4xj4TQar2aEHIRRF2r9UGhoCS0cQAvD_BwE

https://powerlandb2b.com/products/sunsynk-sun-5k-ecco-hybrid-inverter?currency=GBP&variant=43702443180342&utm_medium=cpc&utm_source=google&utm_campaign=Google Shopping&gclid=CjwKCAiA2fmdBhBpEiwA4CcHzfdI503sA_rzxFEQKCX1KKVUnqox4MxySRXvHrXeqBK8qlll4oisNxoCuhwQAvD_BwE

shavy65

Heedtheadvice said:

shavy65 said:

Home Energy Scotland doing interest free grants for Solar Batteries at the moment for up to £6k.

Are they not loans rather than grants? Could still be useful

Yes, again my error, I`m nightshift at the moment.....nightshift brain not in gear. As u say, it is a loan yes.

Grandad2b

PV installed 25 January, still waiting for export MPAN so watching my solar disappearing into the grid... 
Smart meter installed 21 February. Since then (up to Saturday which was the last time I checked) imported 239, exported 491. 
Should I get a battery? How big? 
Battery could mean evening meal cooked with free PV rather than imported leccy. Or would it? Does battery respond quickly enough to oven 'stat switching? Is that determined by the battery or the inverter?

Alnat1

We generally use around 0.3-0.5kWh a day from the grid. I call them "leaks" but it happens when the inverter takes a few seconds to change to battery power when something is switched on.

Worst days are when hubby is messing with some kind of plug in power tool and uses lots of short bursts of electricity, grrrr 

1961Nick

Alnat1 said:

Worst days are when hubby is messing with some kind of plug in power tool and uses lots of short bursts of electricity, grrrr 

You need to buy the hubby a selection of premium battery powered tools ... I'm sure he won't complain.

Alnat1

Oh he has those but there's an annoying chop saw thingy (long bits of wood need to be short for his fire pit) and the nail gun compressor whatsit and something for spraying paint on fences. He cannot be happy with a saw, hammer and paint brush!

Grandad2b

I assume different inverters have different characteristics - reading some of the posts above it seems some can provide >3kW off the battery but others won't.

I'm not sure how to start working out what I need or even if it makes sense to try to store the free PV once we start getting paid for our export. it's very difficult without a full years figures but in theory we would end up just paying the standing charge if we just carried on as we are.

1961Nick

Alnat1 said:

Oh he has those but there's an annoying chop saw thingy (long bits of wood need to be short for his fire pit) and the nail gun compressor whatsit and something for spraying paint on fences. He cannot be happy with a saw, hammer and paint brush!

DeWalt do a lovely 54v chop saw & a compressor for his nail gun.

Alnat1

We have a 4.8kW battery and I'd like to add another which would just about cover us for 24 hours. That way, in winter, we can fill up from the grid with cheaper overnight electricity and not have to worry when the panels only generate 0.3kWh the next day.

Battery prices seem to be dropping slightly so we're hanging on over summer to see if they fall much. The 2nd battery probably wouldn't pay for itself but would make me smile on gloomy days 

EcoScruples

Alnat1 said:

We generally use around 0.3-0.5kWh a day from the grid. I call them "leaks" but it happens when the inverter takes a few seconds to change to battery power when something is switched on.

Worst days are when hubby is messing with some kind of plug in power tool and uses lots of short bursts of electricity, grrrr 

Very similar here, average 300w per day from the grid, this is mostly the delay in the battery switching from charge to discharge, it's only seconds so not a big issue.
Also showers that the family has that pull that full 10kw with 3.68 of it from the battery.

I have slowly started to move all my power tools (circular saw especially) to battery power to avoid the spikey pull on the grid.