Hey T2m, Ok if i break your post down?
Yeah, i noted the system produced no power during some months, but as its a long term system, I was looking instead at the approximate yearly output on the basis that even if every year had 3 months with no output, we could still see the yearly approximate benefits of the system, so as to get the realistic worst case scenario of no power all winter say. Months without power are ok, as long as you still have a reasonable yearly output, as that removes sasonal variation, output problems due to wildfires and their smoke (Aussie after all), etc. Yearly outlooks smooth the random factors.
thinkstoomuch wrote:A couple of quibbles no real disagreement.
Did you notice that the system produced no power in March 2016 and 2015? Or February of 2015? Not exactly no risk.
For people like my family and others who are just using it to offset costs, buyback doesnt really matter. But to use a relevant rate, our rate is also abou t25c/kw, so it matches the example rates, although im in nz, but i suspect local prices will be within 1-2c/kw. But having a solar system means up to 4.6kw for a 5kw system can be considered free energy during the day, so your fridge, freezer, aircon in hot places etc, well, between an hour or so after sun up to near enough sundown, well thats all free energy. The buyback of the extra is a bonus, and should be treated as such. The biggest advantage is in lower power prices, not being paid for generating excess.
People really need to look at the individual electricity bill and local utility buy back rates. Daryl might be able to give us some info on.
That local buy back rate is subject to change. Ask Hawaii, Nevada, or ... .
Oh yeah, connection fees will probably end up being the majority of most bills in the future, but as of now, those who have solar have cheaper bills, or those with hydro and wind...
But my problem was for US use. From March 2015 to February 2016 electric bill was $443.17 TOTAL taxes and connection fee included($90.84 which will not go away). That Connection fee actually increased with the latest rate decrease the third one in the last 2 years.
OK, you have a really low rate. out here its about 50/month for the connection fees, not yearly. unless your figures are monthly? 450/year is actually a really good power deal.
My useage: Roughly 3,662 kWH a year. For this system it produced 12,647 in 2014 and 2015. So I sell back the excess, at the rate of $0.02559. Which earns me $136. Or average earning of $68 a year.
Sorry T2m, but monthly bills or yearly? you mention up above yearly costs, but below 420/month. at 420 month, its 24 months, not years of payback.....
So total economic value of $420 a month. Divided into $9,700 equals 23.1 years not counting installation.
cheers for the extra data points T2m. Extra data is always useful.
Actually this system is similar to what I can expect out of one installed on my roof according to PVWatts,
http://pvwatts.nrel.gov/pvwatts.php, (only works in northern hemisphere
) a 5 kw system would generate ~7,8 MWH. Counting the fact that >10% went away during no output months.
Another example I meant to include in that last post.
http://www.eia.gov/electricity/data/bro ... req=M&pin=It is a 10MW utility scale plant ~120 miles up the coast. Of curse the Array is actually 11.5 MWpdc.
Sort of works for me. Installed in 2010 but starting in full years; 2011 18842 MWH, 2012 18,508 MWH,
2013 18,169 MWH, 2014 17,551 MWH, 2015 17,682.
If I divide that by 11,500 I can get what a 1 KW system on the east coast of Florida , hopefully optimally placed, can expect. So in it would output 1.638434783 kWH, 1.609391304 kWH, 1.579913043 kWH, 1.526173913 kWH, and 1.537565217 kWH respectively. (PVWats for that location with SolarAnywhere data would be 1,802 KWH(with my roof tilt and orientation).) <shrug>
Which also shows real world data and age degradation. It does agree with the PVWatts output of 1.558 kwh for a 1 kWp roof install or 1,791 kwh for a 1.15 kWp.
Yeah, being in a hurricane zone probably doesnt do you favours for the ocst of the system and install.
Yep I am anal retentive. Just FYI for my roof tilt is 12.3 degrees and orientation is 182. Max capacity depending on zoning requirements for a 170 mph wind zone is 24 60 cell panels (actually 4 arrays around roof penetrations). 72 cell panels do not fit right depending on zoning requirements.
Rough numbers from Iron Mountain design assistant is that racking is going to cost around $0.40 to $0.60 per watt.
Need to talk to county and find that out more detail of zoning requirements. Talk about a zoo, zoning requirements, if you don't deal with them constantly will drive a person to drink. Then again Hurricane Andrew points to the reasons that they are in place.
Have fun,
T2M
Good talking with you T2m.
PS That 2.6 kwp system I quoted up thread went
down ~$100 since then. Today it is $5,428. No roof attachment points though so not total cost required.
Same site has a 5.2 kwp would be $9,136. With Solaredge systems.
PPS after 2.5 hours excuse the editing. I's done.
183% and 56% respectively. But if Australia which went down ~3 cents or to ~22 cents. I pay 50% for usage.{End edit}