Hi all - hoping you guys can help me figure out how concerned I should be about this config that my installer is hooking up for the Canadian Solar panels in parallel strings going into 2 flexboss21's.
I see 2 issues...
1- string counts are not the same... my understanding is that in a parallel string config where the panel count is different (10 vs 9), the MPPT will use the lesser of the 2 strings and it would be the same as if there were 9 panels in each string, wasting the 10th panel. I think that I can have them move a panel from stringA to stringD to make the paralleled strings equal.
2- Imp in parallel string config is over the 26A for the MPPT
My installer has the following parallel string setup for each flexboss21:
You should be fine regarding the amperage. You’re correct, as long as you don’t exceed 31A on MPPT 1 and 2, it will not cause issues. The amperage can increase slightly in hot conditions, but that depends on how high the temperatures get in your area.
As for the warranty, it does not cover issues caused by poor workmanship by an individual, installer, or company. In other words, if you knowingly install the system in a way that could cause damage to the inverter, the warranty will not apply.