July 3, 20241 yr Hi everyone, this is my first post here. I have an 8kw Fivestar inverter with 9.6kw batteries (2x4800) and want to add panels. Having read up here I think adding a string of 7 panel with specs in the picture should be a good match? Any advise? Thank you
July 3, 20241 yr My humble 2c worth. Everything at own risk, for you to check, open to other opinions. The missing info here is your max PV input current. Please double check whether your inverter is the one in the link below. https://www.lightmarket.co.za/products/48v-8kva-6000w-120a-mppt-wifi-compatible-parallel-hybrid-solar-inverter-fs-i008 It gives a value of 20A. If this is correct, basically you seem safe; it should work technically, if 7x650W=4550W are all you ever want to connect and if your panel installation is suited to bifacial panels, which this looks like it happens to be. Which is to say, ideally you want it mounted on some type of structure in an environment that gives reflection onto the back of the panel for optimum power generation. Or you may be disappointed with the real-world output. For a normal rooftop installation, maybe consider a Canadian Solar 600W panel. Firstly it allows to match the 6000W maximum PV input more precisely with 10 panels. The 17A Imp and 41.2 Voc should also be fine. Okay, I see the 650W Fivestar panel is available at a better price than the Canadian, but if you only use the front face in practice, you might be buying effectively a 500W panel. Number just made up for illustration (edit: but the bifacial panel advertises up to 30% more power than a conventional panel, which suggests 500W power off the front face out of 650W total rated power is not a bad guesstimate, though they don't say it straight like that). Your choice what you want. Edited July 4, 20241 yr by GreenFields
July 3, 20241 yr Author Thank you for your comprehensive reply. I appreciate getting a better understanding of the bifacial panels, I think you are correct in selecting the Canadian panels. Just a question, is the max solar charge input current (120a) not the max PV input current?
July 3, 20241 yr 37 minutes ago, johnna said: Just a question, is the max solar charge input current (120a) not the max PV input current? No, that's not likely. The 6000W max power on a 120A current, indicates it's rather the current through the battery cable at around 50V. The panel current, if you consider 6000W Power, say just roughly approximated at 400V , that's more in line with around 15A input current of the panels to the MPPT.
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