Solar PV battery options

Currently looking at all battery options at the minute and weighing up costs.

Have a 5kWh Puredrive at the minute and have been trying to get a price for a second one. Priced in the north at £1650 so €2100+ factoring in exchange rate and collection costs. Have tried Puredrive direct put response from them has been non-existent really. Original installers are quoting €2200.

I am currently in contact with a manufacturer in China with a view to importing direct and am firming up prices to see if it is worth it.

I think 10-15kWh battery charged in this weather would get me through the day without any grid use really.

great going alright, I envisage something similar for ourselves.

Very interested in following this path. I have Dyness - but replacing with something and selling the old Dyness would be fine too.

Did you try Failte Solar already? I got an email reply to ring them on mobile.

yes, it is grafana.

here's my full dashboard over 3 months ago https://www.boards.ie/discussion/comment/118381941/#Comment_118381941, now it has even more stuff.

This is great - and im a little jealous. Ive only 5KW battery and im seeing about 3/4 KW needed per day imported at this stage.

Trying to decide is it worth me adding more battery to fill in the later hours - or should i just keep with the night rate savings. I am afraid if i overbuild from this point I will end up just adding years to my payback.

Don't even think about payback, go for it, it's more fun this way 😁

FIT will be useless and you can always fully charge the batteries on night rate in the bad months.

I'm looking at going from 5kwh to 20 myself, will probably never pay back (or payback in 2 years thanks to that stupid commie) but I don't care, I want to be able to do stuff like cook in the evenings without draining half the battery, gaming also wastes a ton of power in the evenings in the house, and still want to be going on battery until the next time the sun comes out, then winter time charge them at the EV night rate which might do me for the day, almost.

No BMS can distinguish between the voltages of paralleled cells...

If you want a 20kWh battery pack from 32 200Ah cells, you really should configure them as two parallel packs of 16S1P, each with their own BMS

Is there any point? Even if you charge the whole battery every night at night rate, and use it all up at day rates, you will save 9kWh (usable) * (19c day - 9c night) * 80% round trip efficiency = €0.72 per day (€250 roughly per year), the system will cost you at least €2000 (if you buy really well) to setup plus the cost of the electrician

True enough. And what is missed quite a lot in these discussions as well is that night rate electricity in Ireland is much cleaner than day rate. It is already over 50% from wind. It's not all about money.

Also looking at 32 x 200Ah. What did you pay? I know these were €2500 incl shipping before Christmas but looks like never to be seen at those prices again

Ordered. Tks☺️

Best way to clean up your grid use is to max all your roofs with panels! I live in a small semi-detached house in a suburb of Lucan and I have 8kwp, producing about 7MWh per year. A typical house in Ireland (without EVs or heatpump heating) uses about 3MWh per year!

5 panels on kitchen extension, 5 panels on house roof (busy up there, already had 40 tubes and 3 velux windows) and indeed 14 panels on my large new shed, all south facing 😁

Someone was joking this morning, asked me how long it would take for the shed panels to actually pay for the build of the whole shed 😁

BTW my virgin road / north facing front of the house is next if / when panels would drop significantly in price. According to Quentin, a north facing typical roof angle panel in Ireland produces about 50% of a south facing panel, so could very well be worth it then. Would fit about 18 panels on that in theory minus a few panels for chimney shading...

Bought some more batteries from PWOD last night too, just got an email that they have already shipped

Photo could have been a lot worse 😂

I ordered 32 more CALBS, not quite sure what to do with them yet. I might sell my current 16 to someone who doesn't want to wait for 2 months for delivery from China. And install the 32 new ones. Payback period? Not too worried about that. But I am currently still load shifting. If you load shift 365 days a year with a 20kWh pack, that alone is worth about 18kWh (usable) * 365 * €0.1 (difference day and night rate) * 80% efficient round trip = over €500 per year. That alone makes for a decent payback! And the difference between day and night is likely further increasing.