Hello, I have a SOFAR inverter with two string inputs operating in 'independent' mode. There are 10x 400W panels on the East string which produce approx. 10A at 30V each on a sunny morning. The second string is made of four south-facing panels and two west facing panels. All 6 of these panels are fitted with TS4-A-0 optimizers.
This second mixed south & west string produces a max of slightly over 7A at 30V per panel (i.e. it never reaches the 10A of the East panel). Does this make sense when the sun is south facing and therefore shining directly onto the south panels? I'm guessing it does and that even though the south panels on their own could in theory produce approx. 10A, that the overall string power of 180v x 0.7A = 1.26W is better than the 4 south on their own producing 120v x 10A each = 1.2KW. The optimizers are therefore deciding that 0.7A is a sweeter operating spot?
The behaviour that I cannot understand however, is that the inverter display shows that the combined South and East panel string's overall power is oscillating quite rapidly - e.g. changing 2 or 3 times per second from about 1KW to a peak of about 1.4KW. While there is some sun haze variation, the sun intensity is not varying that rapidly. The 10 panels on the East string produce a relatively stable power output on the same days that the combined South & West panels are varying rapidly. Can this be explained by the Tiga Optimizers? My inverter was replaced (not for this reason) and this behaviour remained consistent so that rules out the inverter. I therefore suspect it is either a faulty panel, loose connection or faulty optimizer .... or are these types of rapid variations normal for strings fitted with optimizers even on relatively clear blue sky days during periods while none of the panels are in shade?
Any explanations would be greatly appreciated or should I be telling my installer that there is a fault somewhere in this string? BTW, the system is not fitted with a TAP or CCA.
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