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I would recommend looking at the numbers of production from all aspects to determine best production of this system for its location etc. Use all of the calculators available. Using the 6000 would still be an over inverted system. You are adding up modules with STC ratings and are still short of warranting a 6000 TL. Look at the PTC ratings as well and consider both in the design. I know that SMA's like to run with a full load and or maximum strings and I am seeing longer life with these designs in the field. If you are going to expand and in the next say year or so then perfect. Do it while yo can still match the new modules with your existing modules, and your array should be around 7600 STC. As far as production loss and inverter life I think you would be better off with the 5000 TL for what you have existing. IMO and from what I see in the field, the inverter in this design will be lucky to make it past its warranty, if it makes it that far before failing.Comment
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What's upsetting is I knew some of this about sizing or at least the concept and that I needed to get the details on but I got in a hurry. I did not recall anything about premature failure. I thought it was just an issue of price and efficiency.
Well the old saying is Fast, cheap or good, Pick any 2.Comment
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I am not saying that it will fail prematurely, and I cannot prove that, regardless of what I see. And it will not say that anywhere in any SMA paperwork or design tool that I have seen. Sunny Design is there to help us determine the optimal string size for the inverter(s) chosen. It does have capabilities of calculating consumption payback etc. And I will probably catch some flak for my comment. But I still had to mention it as a possibility for you to consider. In theory it should last long and be very happy. I have great success with SMA inverters. They are my first choice because if designed properly they will last past their warranty period. Solar PV is an investment and we want to make sure that whatever components are used in conjunction with each other will provide you with an ROI that is the shortest. -
There are forum members who have justified that a bigger inverter will have more heat dissipation capability and will run cooler when under-loaded, extending its life. I've not bought into that idea... all of the inverter manufacturers consistently recommend a DC/AC ratio over 1, and although there may be commercial reasons for doing that, it is hard to see how that recommendation would hold up if inverter life was compromised.
Anyway.. ncs55, for whom do you work? You can freely link to your company's solarreviews.com page, if one exists. -
sensij, I will get flamed for posting this, but I see exactly the opposite results in the field. too large of an inverter runs hotter. Go with the manufacturers recommendation, that is why they provide string charts. As far as who I work for. I own a solar company and work for myself. I have been licensed since 2005. I am active in all aspects of the actual design installation and repairs that we perform. I do have a solar reviews page but not by my choice. I found that my company had been added to that website without my knowledge and I had to go and correct the incorrect information that was never verified and being displayed by the website when they posted it. IMO that website just lumps all solar contractors in one basket and if you do not pay for the premium service or leads they make you look pretty bad. It is fairly biased in how it represents the contractors. I am not here to post my company up to get business either. I do plenty of designs, permits, installations and repairs for other contractors. Therefore I have no need to pay for a generic lead. I work for C-10's, B's and other licenses that want to make their systems the best and have better quality than others in the So Cal region. And I also have plenty of people that come to me by word of mouth.
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