I have a Kodak OG7.2 with 3xHubble 5.5kw batteries and 2x6series 550w JA solar panels. i only get to generate about 3.5KW from the solar panels. if i look at the watch power app there is a 1.2 to 2 kw difference between PV1 and PV2. I have swapped the 2 string but the result still stays the same. where PV 2 is the highest out of the 2 strings. what could be the issue?