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SMA String VS Solar Edge with Power Optimizers
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details about optimizers. But if they are a variation of the well known buck converter, they should be FAR simpler
than any inverter. Multiple phase bucks and high frequencies would help. I would avoid them here, with little
shade (where is my chain saw), as they will be another source of radio interference. Bruce RoeComment
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Any switcher puts an awful strain on electrolytic caps; designing them out should really help. I don't know any
details about optimizers. But if they are a variation of the well known buck converter, they should be FAR simpler
than any inverter. Multiple phase bucks and high frequencies would help. I would avoid them here, with little
shade (where is my chain saw), as they will be another source of radio interference. Bruce Roe
OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNHComment
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This is older but shows some of the internal components:
https://www.solaredge.com/sites/defa...imizers-na.pdf
buck-boost circuit. What they don't mention is that the optimizer losses must be added to the supporting
inverter losses, bringing them down to or below micro efficiency. The system design certainly gets more
complex, but in a varying shading or clipping situation, the optimizers should do better.
There has been the thought of improvising a home brew optimizer, for a complete string subject
to earlier gradual shading. But so far it has been easier to just cut the tree. Bruce RoeLast edited by bcroe; 05-03-2017, 04:37 PM.Comment
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Can't tell for sure, but the quite high efficiency and limited # of parts implies a non isolated buck or
buck-boost circuit. What they don't mention is that the optimizer losses must be added to the supporting
inverter losses, bringing them down to or below micro efficiency. The system design certainly gets more
complex, but in a varying shading or clipping situation, the optimizers should do better.
The buck-boost system allows them to have a much wider operating range.
No shadow outperforms optimized with shadow any day.Last edited by ButchDeal; 05-03-2017, 04:48 PM.OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNHComment
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The situation here might be a string some 30' long, and the panels get shaded one by one. A
"string optimizer" might keep the remaining unshaded panels working a while longer at their
full efficiency; the shaded ones going to bypass. Not every string here needs this. Bruce RoeComment
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The situation here might be a string some 30' long, and the panels get shaded one by one. A
"string optimizer" might keep the remaining unshaded panels working a while longer at their
full efficiency; the shaded ones going to bypass. Not every string here needs this. Bruce RoeComment
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I've never liked the argument that it's hot on the roof, and the parts will die. These electronic boxes are designed to withstand the heat. Heat on a roof is not an unknown factor. Car manufactures have all sorts of electronics under the hood that are punished by heat for decades and they keep on working. Only time will tell, but so far there does not appear to be heat issues with the newer models.Comment
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just what benefit might be possible. It seemed like a fun project, the strings are 3KW, a little bigger than any
switcher built here before. The idea of uneven size strings is interesting, now all strings have 720 cells. Bruce RoeComment
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The original SolarEdge optimizers had no electrolytic caps in them. I checked before getting involved with them and was the reason I thought they would be better than the Enphase design. Still had a bunch of them fail within two years. Oh ya, car electronics and high under hood temps. That's a good one - how long do auto makers warranty their stuff?BSEE, R11, NABCEP, Chevy BoltEV, >3000kW installedComment
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car electronics and high under hood tempsPowerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-ListerComment
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Heat on a roof is not an unknown factor. Car manufactures have all sorts of electronics under the hood that are punished by heat for decades and they keep on working.
Note that there are systems (down-hole monitoring for example) that do indeed work at extreme temperatures. They often have lifetimes of weeks to months.
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The equipment is improved and proven, Do you base your auto purchase decisions on the reliability of cars made in the 1970s?
OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNHComment
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