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.

funnyname

https://www.boards.ie/discussion/comment/123547845#Comment_123547845

Yeah we have a smart meter, currently with Energia on a 1yr contract which is up soon so will be using energypal.ie to help find a better contract.

deezell

https://www.boards.ie/discussion/comment/123548495#Comment_123548495

Thanks. You list two rates, not the usual smart meter three which generally has a punitive peak time in the afternoon/evening, which by my calculations over the years usually negates virtually all the savings if you cook with electricity. Do you have three rates or is that a version of day night rates they're offering. It'll probably leap up after the year anyway, I'm on the lookout too, but am on the verge of installing solar, plenty of FIT, and no battery, so a reasonable 24hr flat rate would be my ideal.

funnyname

yeah it's a day night rate with peak the same rate as day