Fox H1 inverter open circuit voltage?

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Rogerdygas

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I have a Fox H1 and plan on connecting 18 panels to it in two strings of 9 (open circuit voltage of 37.8v per panel).

The inverter manual says the below, is it 600v per string or for both strings?

H1 series inverters can be connected with 2-strings of PV modules. Please select suitable PV modules
with high reliability and quality. Open circuit voltage of module array connected should be less than 600V,
and operating voltage should be within the MPPT voltage range.
 
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