Hedges I See Electromagnetic Fields! Joined Mar 28, 2020 Messages 20,479 Jan 6, 2022 #21 Camp Friday said: Thanks, Click to expand... Not so fast, unless you enjoy the smell of magic smoke in the morning.
Camp Friday said: Thanks, Click to expand... Not so fast, unless you enjoy the smell of magic smoke in the morning.
B Bud Martin Solar Wizard Joined Aug 27, 2020 Messages 4,843 Jan 6, 2022 #22 Camp Friday said: Thanks, Click to expand... Please read post #19. 2s3p will be for 24V system. Last edited: Jan 6, 2022
Hedges I See Electromagnetic Fields! Joined Mar 28, 2020 Messages 20,479 Jan 6, 2022 #23 If this data sheet (which looks close but not identical in terms of Voc) is correct regarding temperature coefficient: https://d140hlzzaoq16w.cloudfront.net/media/sparsh/product_attachment/custom/upload/REC-Solar-Peak-Energy-72-Series-datasheet-US-ENG.pdf I calculate that two panels in series is OK down to -32C which is -26F (below that, Voc of the two could exceed 105V rating of SCC.) So 2s3p should be good for a 24V system. If you stick with 12V system, PV panels would have to be 1s6p (or split over multiple charge controllers.)
If this data sheet (which looks close but not identical in terms of Voc) is correct regarding temperature coefficient: https://d140hlzzaoq16w.cloudfront.net/media/sparsh/product_attachment/custom/upload/REC-Solar-Peak-Energy-72-Series-datasheet-US-ENG.pdf I calculate that two panels in series is OK down to -32C which is -26F (below that, Voc of the two could exceed 105V rating of SCC.) So 2s3p should be good for a 24V system. If you stick with 12V system, PV panels would have to be 1s6p (or split over multiple charge controllers.)