February 18, 20215 yr For example if my string voltage is 400 volts, should the surge protector be rated just over the 400 volts or can it be even a1000 volt unit
February 18, 20215 yr I'd say a 1kV unit should be fine, a surge is what a nearby lightning strike may induce and it will either do a substantial impulse induced voltage or none at all. If its a direct strike all will be toast/carbon and no surge protector will protect anything.
February 18, 20215 yr A 1000V protector is going to offer no protection until the voltage rises to just over 1000V. You should be okay if your MPPT is built to withstand this voltage - otherwise select an overvoltage protector that is as close to the absolute max of your PV string voltage. The Citel part "DS240-350DC" is rated for normal operation at 350Vdc and absolute max of 460Vdc, so may be borderline for your application (I am not sure if your "400V" is normal operating voltage or absolute max). Citel DS240S Datasheet.pdf Edited February 18, 20215 yr by NigelL
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