Random Renewables Thread

deezell

https://www.boards.ie/discussion/comment/123547709#Comment_123547709

Figures are good, but you'll have to knock off a small percentage of the shift. It takes maybe 5 to 10% more to put a Kwh into a battery especially at the final kwh of capacity, and you lose maybe 5% in heat drawing it down and inverting it to AC.

So say, using 5% loss, for 10Kwh, you buy 10.5 kwh at 13c each, and this replaces 9.5kwh at 26c, you save €1.05 per 10kwh cycle, and for 2000 kwh or units annually (I presume you mean kwh, not w) , you'll save 200 times this, €210. Is €210 per year enough to cover the write off of your battery system over a ten year lifetime, and the probability of failure? Maybe. Maybe it will still work for another 4 or 5 years with reduced capacity and increased inefficiency. If you've paid 5 grand for the battery, you'd need it to work for 25 years. If you've paid 2 grand, you break even after ten years. It's probably a better prospect if you're using it to time shift free solar to use at peak.

Can I ask is that a smart rate or a night/day rate, and if it's a one year offer? The gas man at Flogas has written to me saying my 12 month switch flat rate of 23.44c expires in August, and they'll shift me to a rate that they estimate will add €572 to my bill, based on 4200kwh/annum, which I've calculated will be an extra 13.62c/kwh, and new flat 24h rate of 37.06c.

26c/13c seems very attractive.

con747

@graememk looks like this thread has gone like solar for beginners went a while ago so a few posts should get it to kick into the next page.

con747

bump

con747

Sorted.