Spacekiwi wrote:Cheers T2m.
So, looking at one example, (
https://monitoringpublic.solaredge.com/solaredge-web/p/site/public?name=20%20maud%20st#/dashboard), this Queensland spot has a 5kw system, and in 2015, produced 4.31MW of power. At a standard use rate (Qld's tariff 11), the power rate is 22.2c/kw. This is $960 saved in one year. 8.3mw in 2014 was $1840 saved. Say $1300 a year. At the current estimated costs from the Gun guns guns post of mine, (p147 in the thread) solar costs for this system would be 9700 AUD. That works out to a payback period of between 5 years at best output, and 10 years at worst output, with about 7.5 years as an average. Thats an insane return on your investment, starting at 10%, and hitting up to 20%! And unless electricity prices drop, and really really drop, for a long period of time, you can consider it an effective risk free return...... And against a 10% guaranteed PA return, with all returns reinvested, still has an overall return of 2,200.
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.
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 ... .
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.
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.
So total economic value of $420 a month. Divided into $9,700 equals 23.1 years not counting installation.
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.
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
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.
