kmin's latest activity
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Kkmin reacted to efficientPV's post in the thread Water heating without charge controller or batteries with
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Everyone should be aware that when the contact opens, the switch sees the open circuit voltage of the panels. That is why the MW&S... -
Kkmin replied to the thread Water heating without charge controller or batteries.Important point to remember! Not just for thermostats, but for everything related to solar setups. Everything has to be rated to open...
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Kkmin replied to the thread Water heating without charge controller or batteries.I was writing about relay, not thermostat. If a relay is rated for 250VAC / 30VDC, either I can use it for <30VDC, or I can't use it...
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Kkmin replied to the thread Water heating without charge controller or batteries.With a random heating element it would not work, for a reason I wrote in post #14. Matching your heating element carefully with your...
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Kkmin replied to the thread Hello everyone from the Netherlands, Dear Diary....Lot of good arguments guys! Some of the best ones to my opinion are: -Shading -Flexibility in orientation I was not enough precise...
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Kkmin replied to the thread Hello everyone from the Netherlands, Dear Diary....Since you have been doing lot of research and thinking, I'd like to hear your opinion. What are the pros and cons of 10 x micro inverter...
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Kkmin replied to the thread Do solar panels degrade if being stored indoors away from light?.Biggest cause of degradation is actually chemical reactions in (low quality) plastic layers (mainly EVA) and adhesives...
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Kkmin replied to the thread Do solar panels degrade if being stored indoors away from light?.Temperature UV-light Humidity
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Kkmin replied to the thread Water heating without charge controller or batteries.No you don't. As mentioned normal AC relays are rated up to 24-30V DC.
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Kkmin replied to the thread Water heating without charge controller or batteries.Second problem is that this calculation would be valid only on moment of full production. Vmpp of a panel is almost constant, but Impp...
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Kkmin replied to the thread Water heating without charge controller or batteries.You will have two problems with this setup, one worst than another. First, 600W 24V heating element is VxV/P =0.96ohm. Your panels...
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Kkmin replied to the thread Water heating without charge controller or batteries.Why? He was looking for to use one 120W 12/24V panel. Common AC relays are rated for small DC voltages, normally 24-30V. It's even...
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Kkmin replied to the thread when connecting 3 panels in parallel my amps did not increase-volts stayed the same..Lot of confusion here. Obviously you can't measure amps with "voltage tester". You can with multimeter that has amperometer, up to it's...
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Kkmin replied to the thread Solar panel output.What a delusion! Damn trees. I was hoping some ridiculous 20+ hours per day.. 😀
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Kkmin replied to the thread Solar panel output.For curiosity, how many hours of production you get per day in the middle of summer, around juhannus?
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Kkmin replied to the thread Solar panel output.You would go over max usable current 20A vs 17A. Anyway, max 2500W looks too low to me, I would expect 3000+ consistently.
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Kkmin replied to the thread Used solar panel produce less... ?.Most common degradation is caused of low quality laminates (mainly EVA) and adhesives reacting to UV, humidity and heat. This...
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Kkmin replied to the thread Used solar panel produce less... ?.I wrote max power, not max current. And I wrote that formula Pmax = Voc * Isc is ridiculous because it does not exist! It's like...
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Kkmin replied to the thread Used solar panel produce less... ?.It is ridiculously wrong because when you measure open voltage, current is zero, so power is 0. When you measure voltage and current at...
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Kkmin replied to the thread Used solar panel produce less... ?.It's true, but your power output formula is ridiculously wrong. Open circuit voltage x short circuit current..? Try to measure them...