Solar-Panel to Controller Loss
Much has been made of the lower losses on the panel to controller path with MPPT because the amps are less. So once you have your loss measured, how valuable is it to improve on that if you don't lik...
Forum Discussion
Thanks for the calculations!
Salvo is using Vmp but it looks like it is Voc that counts?
Here are the IV curves for my 255 panel and its other specs. The I-V curves for temperatures shows what I have seen and reported where at 45C, voltage is 35v
http://www.canadiansolar.com/down/en/Datasheet_Quartech_CS6P-P_en.pdf
My own measurements of 45C and 35.2 Voc seems to validate my IR gun method of pointing it up under the tilted panel for how to do that.
I am stuck on how to interpret the insolation IV curves as to how low for low light you need to go to get a Voc of 30v.
The actual amps reduction doesn't matter as that just means taking longer to raise the Vbatt.
You get both things together so there are many scenarios! Low light but low temp too, etc. The NOCT panel specs combine 45C panel with 800 light, but that is just one scenario.
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Tee hee, Morningstar must have missed how I got the 24v bank to 30v with my Solar30 on the 60 cell 255 at 45C :)
Salvo is using Vmp but it looks like it is Voc that counts?
Here are the IV curves for my 255 panel and its other specs. The I-V curves for temperatures shows what I have seen and reported where at 45C, voltage is 35v
http://www.canadiansolar.com/down/en/Datasheet_Quartech_CS6P-P_en.pdf
My own measurements of 45C and 35.2 Voc seems to validate my IR gun method of pointing it up under the tilted panel for how to do that.
I am stuck on how to interpret the insolation IV curves as to how low for low light you need to go to get a Voc of 30v.
The actual amps reduction doesn't matter as that just means taking longer to raise the Vbatt.
You get both things together so there are many scenarios! Low light but low temp too, etc. The NOCT panel specs combine 45C panel with 800 light, but that is just one scenario.
-------------
Tee hee, Morningstar must have missed how I got the 24v bank to 30v with my Solar30 on the 60 cell 255 at 45C :)
