Browse Forums Eco Living 1 Oct 29, 2012 7:59 pm I'm thinking of spacing a Grid-Connect system as part of a house build. I checked my powerbill and my usage has averaged from 8.3 to 13.7 kwh per day. What capacity solar system would I need for a capacity up to 15kwh per day? How many panels would I need for this type of system? What is a reasonable price to pay for this type of system? I live and will be building in Rouse Hill (Northwest Sydney). Are there any suppliers / installers I should look at? Any advice appreciated! Build thread: here Land Nov 12, Contract 6/07/13, Consent 15/08/13, Start 20/09/13, Slab 25/09/13, Frame 4/10/13, Brick 21/10/13, Roof 2/11/13, Lock-up 17/12/13, Handover 3/3/14 Re: Solar - what Kw capacity do I need for 15kwh/day 2Oct 29, 2012 8:18 pm I reckon about 3.5kw generated for each 1kw of panels so 4.3kw should do the job. There is more info on my blog in the sustainability section see the link in the signature. The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Solar - what Kw capacity do I need for 15kwh/day 3Oct 29, 2012 9:00 pm bashworth I reckon about 3.5kw generated for each 1kw of panels so 4.3kw should do the job. There is more info on my blog in the sustainability section see the link in the signature. Some interesting info there. How much space do your panels for a 1.5kw system take up on your roof? Build thread: here Land Nov 12, Contract 6/07/13, Consent 15/08/13, Start 20/09/13, Slab 25/09/13, Frame 4/10/13, Brick 21/10/13, Roof 2/11/13, Lock-up 17/12/13, Handover 3/3/14 Re: Solar - what Kw capacity do I need for 15kwh/day 4Oct 30, 2012 5:03 am My thin film panels are around 1.2m2 per 100w. You can get monocrystaline panels which are a fair bit smaller for the same output. The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Solar - what Kw capacity do I need for 15kwh/day 5Oct 30, 2012 9:25 am maximus I checked my powerbill and my usage has averaged from 8.3 to 13.7 kwh per day. What capacity solar system would I need for a capacity up to 15kwh per day? This is way outside my level of expertise but just a quick comment nevertheless. I assume that the figures you have quoted are your total power usage. As such, you need to look at the feed in tariff applicable when determining the best sizing and bang for bucks. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Solar - what Kw capacity do I need for 15kwh/day 6Nov 04, 2012 4:46 pm H2O is correct and it will depend on where you live, the orientation of your house and roof area. With due respects to this forum but you would be better asking the experts (contractors) in the Whirlpool forum under Green Tech. My north-facing Suntech panels are rated at 190w X 16 panels = 3.04Kw system which produces an annual average in Adelaide of 13.4Kwh/day, bearing in mind you only get around an 80% panel output. I would suggest you need around 24 x 190w panels or alternatively 16 x 250w panels. Arfur Re: Solar - what Kw capacity do I need for 15kwh/day 7Nov 04, 2012 5:58 pm Uncle Arfur My north-facing Suntech panels are rated at 190w X 16 panels = 3.04Kw system which produces an annual average in Adelaide of 13.4Kwh/day, wow, that's damn good. I have 18 x 230W monocrystalline panels ( 4.14Kw),north facing, feeding 2 x 2kw inverters. Panels are north facing. My daily average thus far ( installed mid december last year) is 7.1Kw and i'm in Adelaide as well Re: Solar - what Kw capacity do I need for 15kwh/day 8Nov 29, 2012 9:06 pm If your goal is to get to a point where you produce more than you consume, look carefully at reducing consumption and installing a smaller system. It may well come in cheaper than installing a bigger system to match your current consumption. Our 4 person, 4bd house is powered by a 1.7kW system. Even better would be to install a big system and cut your consumption to export more to the grid and green up your neighbourhood. Good luck. Re: Solar - what Kw capacity do I need for 15kwh/day 9Dec 28, 2012 11:38 pm Quote: wow, that's damn good. I have 18 x 230W monocrystalline panels ( 4.14Kw),north facing, feeding 2 x 2kw inverters. Panels are north facing. My daily average thus far ( installed mid december last year) is 7.1Kw and i'm in Adelaide as well Dont get confused, mine was averaged out over a year with a little morning shading from a neighbors gumtree. I suggest your system is not working (or connected) as it should. The only time I get as low output as yours is May -- July in the middle of winter when I average around 6. This time of the year mine (even with an hour or so shading) puts out 20 -- 22.3 max Kwh/day. Averaging over Dec and Jan 16.8 -- 17.8Kwh/day. Arfur Re: Solar - what Kw capacity do I need for 15kwh/day 10Dec 29, 2012 7:33 pm Uncle Arfur Quote: wow, that's damn good. I have 18 x 230W monocrystalline panels ( 4.14Kw),north facing, feeding 2 x 2kw inverters. Panels are north facing. My daily average thus far ( installed mid december last year) is 7.1Kw and i'm in Adelaide as well Dont get confused, mine was averaged out over a year with a little morning shading from a neighbors gumtree. I suggest your system is not working (or connected) as it should. The only time I get as low output as yours is May -- July in the middle of winter when I average around 6. This time of the year mine (even with an hour or so shading) puts out 20 -- 22.3 max Kwh/day. Averaging over Dec and Jan 16.8 -- 17.8Kwh/day. I'd say my system has been connected quite well. I just cant see how you can get the average production you're getting. My summer production is between 25-30kw's. Thats on a 4kw system, whereas you produce 20-22.3 on a 3kw system. Can your system provide production charts? I have attached production charts of my system. The chart is of only one inverters figures, so multiply it by 2 to see my total production as I have 2 x 2kw systems - both with no shade and north facing. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Edit: I just realised i incorrectly stated my average production in the post above - i should have doubled what was on the chart. So it's about 15kw's - sorry mate. Re: Solar - what Kw capacity do I need for 15kwh/day 11Dec 30, 2012 12:50 pm Quote: Edit: I just realised i incorrectly stated my average production in the post above - i should have doubled what was on the chart. So it's about 15kw's - sorry mate. Oh I see your oversight would explain it. But I wonder why they installed 2 inverters? Arfur Re: Solar - what Kw capacity do I need for 15kwh/day 12Dec 30, 2012 1:11 pm Uncle Arfur Quote: Edit: I just realised i incorrectly stated my average production in the post above - i should have doubled what was on the chart. So it's about 15kw's - sorry mate. Oh I see your oversight would explain it. But I wonder why they installed 2 inverters? thats the package that they offered at the time - dont know if there was any price or efficiency driven reason Re: Solar - what Kw capacity do I need for 15kwh/day 13Feb 25, 2013 4:45 pm Best thing to do is get a few companies out to give you a free quote. it depends on house facing, location, panels sizes, panel watts, day time usage and night time usage. If you have any questions please feel free to ask, i have solar installed and also work in the industry, i might be able to give you some pointers. Re: Solar - what Kw capacity do I need for 15kwh/day 14Jan 04, 2014 10:30 am I have a question on this... most systems are designed (by the installer) to not actually produce your total daily power usage, they are instead designed to cover 90% of your actual usage during the time of production... so if you are looking at power usage by hour your average power consumption over the day should look something like this: (Red line) Summer Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ (Red line) Winter Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ So unless there is something about how you're billed to mean that the power company your with is looking at your total daily usage and billing you on the complete input/output figure (so if you use power during the non-producing periods, then returning it as production climbs, and the company somehow allow the production times to cancel out the power usage times?) you'll probably find that your usage during production period is low and you only need a 1.5 to 3kw system. Source:http://www.solarchoice.net.au/blog/home-energy-consumption-versus-solar-pv-generation/ Edited to make sense. Slooowwwwly getting a Manhatten 35 in Middleton Grange 4 7679 DIY, Home Maintenance & Repair This is a very challenging situation, made much harder by not being on site. Firstly, I think that I originally… 10 10504 you need to understand the breakdown of warranties. 90 warranty is considered as minor defects rectification period where as the longer ones are more major/structural… 1 5880 |