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These Sharp modules all have the same rated current and were intended to be used in series. No problem with putting 40 and 20 cell modules in series. If the system required two strings, the strings needed to have the same total number of cells. I found these datasheets. The 20-cell modules were triangular ...

Looks like I made a mistake, the CTs are in parallel if they include a burden resistor. Good reference by Ken. ------------------------------ William Kaszeta President Photovoltaic Resources International Mesa AZ bill@kaszeta.org ------------------------------

John, Your panel CTs need to be in series. That way currents in each panel add to each other. The two L1 CTs are in series, etc. If they are in parallel you will get the average, not the sum. To check that L1 is the same in both panels, simply measure the voltage between the two L1 busses, should be ...

Some points to check: All L1 and L2 measurements, CTs and voltage sense, must be truly be on their respective line. One check is to measure the AC voltage from the L1 terminal in the inverter to the buss where you installed the L1 CT to measure current close to the meter feed. Should be close to ...