Hi,
I have a question that I could do with an opinion on from some of the solar specialists on the forum before I go back to the installer to query the situation.
System installed was installed in Nov 2022 and has 2 strings each with 9 400 W panels – a southerly string and westerly string. The solar inverter is a Solis S6 6kW unit.
The panel spec says roughly 35 to 37v Voc depending on light levels.
With overcast conditions giving what I would judge to be roughly equal light levels on each string there is a significant discrepancy in the string voltage levels as reported by the inverter – typically the westerly string will be roughly 80 volts lower than the southerly one.
The westerly string has 7 panels on one roof and the other 2 panels on a separate roof area with DC cabling linking the 2 groups of panels together through the loft whereas the southerly string is all on one roof.
I have only really noticed the different string voltages in the last 3 to 4 months which could indicate panel faults but I am suspicious as the string voltage difference is roughly the 2 x Voc.
Both strings are working but given the consistent and significant voltage difference between the strings I am wondering if the 2 separate westerly string panels may have been connected with reverse polarity to other 7 panels?
Grateful for any thoughts?
I have a question that I could do with an opinion on from some of the solar specialists on the forum before I go back to the installer to query the situation.
System installed was installed in Nov 2022 and has 2 strings each with 9 400 W panels – a southerly string and westerly string. The solar inverter is a Solis S6 6kW unit.
The panel spec says roughly 35 to 37v Voc depending on light levels.
With overcast conditions giving what I would judge to be roughly equal light levels on each string there is a significant discrepancy in the string voltage levels as reported by the inverter – typically the westerly string will be roughly 80 volts lower than the southerly one.
The westerly string has 7 panels on one roof and the other 2 panels on a separate roof area with DC cabling linking the 2 groups of panels together through the loft whereas the southerly string is all on one roof.
I have only really noticed the different string voltages in the last 3 to 4 months which could indicate panel faults but I am suspicious as the string voltage difference is roughly the 2 x Voc.
Both strings are working but given the consistent and significant voltage difference between the strings I am wondering if the 2 separate westerly string panels may have been connected with reverse polarity to other 7 panels?
Grateful for any thoughts?