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I have spent some time reading into PV panels and inverters while trying to help with a current post on nuisance RCD tripping at a PV installation on a farm. I happened upon this technical paper which explains capacitive leakage currents from PV arrays and the trouble they could cause, especially when transformerless inverters are in use. I thought others would be interested in reading it and learning from it. Helpfully, a compensation scheme is suggested at Section 6 and a way of estimating the capacitance at Section 1.
http://files.sma.de/dl/7418/Ableitstrom-TI-en-25.pdf
http://files.sma.de/dl/7418/Ableitstrom-TI-en-25.pdf