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Switching sides - changing array generation panels (E/W orientation)
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<blockquote data-quote="bladerunnerpv" data-source="post: 551384" data-attributes="member: 35385"><p>Presume your inverter has 2 x MPPTs, East side into one and West into the other?</p><p></p><p>You're trying to stay within the overall dc input watts from PV?</p><p></p><p>You'll have a max volts dc input spec for each mppt though, if you're at the max inverter limit with 8:8 then sounds like you would be exceeding the mppt input V limit by increasing the string from 8 to 10 panels? Not to mention voltage increase as temperature drops. Any opportunity to switch in/out panels would be limited by that.</p><p></p><p>Sorry I don't see how it could work in that case</p><p></p><p>Not to mention how the cables from the panels physically feed into the inverter.</p><p></p><p>If a bigger inverter is not an option then a second small pv inverter for the spare panels could be worth a look but the startup voltage could be a problem with only two panels</p><p></p><p>You might find the inverter has a high enough input pv dc current limit to re-wire the panels in parallel, 2x5 on each side of the roof, that would bring the string voltage down but increase the current. I think that's unlikely to work though, but check the numbers. You'll probably exceed the input pv power limit that way too.</p><p></p><p>Just my 2d worth, I have no practical experience on this...</p></blockquote><p></p>
[QUOTE="bladerunnerpv, post: 551384, member: 35385"] Presume your inverter has 2 x MPPTs, East side into one and West into the other? You're trying to stay within the overall dc input watts from PV? You'll have a max volts dc input spec for each mppt though, if you're at the max inverter limit with 8:8 then sounds like you would be exceeding the mppt input V limit by increasing the string from 8 to 10 panels? Not to mention voltage increase as temperature drops. Any opportunity to switch in/out panels would be limited by that. Sorry I don't see how it could work in that case Not to mention how the cables from the panels physically feed into the inverter. If a bigger inverter is not an option then a second small pv inverter for the spare panels could be worth a look but the startup voltage could be a problem with only two panels You might find the inverter has a high enough input pv dc current limit to re-wire the panels in parallel, 2x5 on each side of the roof, that would bring the string voltage down but increase the current. I think that's unlikely to work though, but check the numbers. You'll probably exceed the input pv power limit that way too. Just my 2d worth, I have no practical experience on this... [/QUOTE]
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Switching sides - changing array generation panels (E/W orientation)
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