This report from GridLab provides an introduction to voltage regulation concepts, including advantages and disadvantages of various control modes. The authors include lessons learned from studies and demonstration pilots and also provide recommendations for utilities.
[pdf] The MPPT operating voltage range for most string inverters is between 80V and 600V, depending on the inverter make and model. The voltage range for Solar MPPT charge controllers is generally much lower and varies from 24V up to 250V.
[pdf] When the DC side input voltage is higher than the maximum DC array access voltage allowed by the inverter, the inverter shall not start, or stop within 0.1s (when running), and a warning signal will be issued at the same time.
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