Most people will probably go for a 4.8kw battery. Can be got cheaper but a decent battery this size will cost about 2.5k to 3k installed minus 1k from the grant.
For a 4kw solar PV system with a 4.8kwh battery will cost approx 7k after grant of 3.8k is factored in.
HOUR kWh
00:00 0.35
01:00 0.22
02:00 0.31
03:00 0.24
04:00 0.19
05:00 0.20
06:00 0.30
07:00 0.28
08:00 0.43
09:00 0.49
10:00 0.53
11:00 0.65
12:00 0.57
13:00 0.85
14:00 1.17
15:00 0.96
16:00 0.98
17:00 1.22
18:00 1.74
19:00 1.38
20:00 0.96
21:00 0.94
22:00 0.93
23:00 0.87
To be fair, I don't think this is an accident. Large numbers of un-managed home solar generators pose real challenges for the grid that structuring the grant this way and trying to force people to also install a battery somewhat mitigates (interesting article here if interested - http://theconversation.com/why-rooftop-solar-is-disruptive-to-utilities-and-the-grid-39032).If householders could sell their excess PV electricity for a reasonable kWh price REFIT level this would do away with the need for a battery
Unfortunately ESB doesn't allow this, hence driving up the costs with a battery.
Again I don't think this is an accident or backward. A recent DCCAE whitepaper (https://www.dccae.gov.ie/documents/Energy White Paper - Dec 2015.pdf) determined that spending money on micro-scale home solar is, by a fairly significant margin, the most expensive way of the government reducing carbon emissions and bringing the country to a greener place. The same amount of money spent on large-scale centralised solar and wind generation would yield much better environmental results while also being much more manageable and predictable for the grid.Once again the government is a bit backward compared to international best practice to make this scheme attractive for householders
I've been wondering about the average efficiency as well.
That’s referring to the efficiency of the panels, showing how much of the energy hitting the panel it will convert to electricity. A “4kW system” already accounts for this though and would create 4kW of electricity, it would just be smaller (area wise) if the efficiency was better than 20%. This efficiency figure doesn't really mean much if you're looking to put a few panels on a large roof, but it would if you wanted to put the highest generating panel you could on top of a car, or a Mars rover etc.Goggle thinks the typical efficiency is about 20%. Which would push the payback out to more like 50 years
A “4kW system” already accounts for this though and would create 4kW of electricity, it would just be smaller (area wise) if the efficiency was better than 20%.
I'm a luddite here re this - but aren't there two types of solar-panelling; one with tubes of some kind that doesn't care whether you're from rain-swept Wesht of Ireland or sunny Florida ....
Sorry cremeegg, I thought when you were referring to efficiency in your first post, you meant how much of your generated solar you’ll actually use as opposed to export to the grid...
And the payback is estimated at 13 years in the SEAI's own literature .. .. ... hmmmm .. .. not. good.
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