For some reason the MPPT calculator from Victron only allows an even number of solarpanels when you want one than one string. I want to connect seven 505Wp panels to one MPPT. Five in series in string one, which comes to 249v, so spot on. Then another two parallel in a second string. The panels are all 14amps max and 45v voc. I think this should not be a problem but I want to be sure and as I said, the calculator does allow two strings but only with same amount of panels