Max panels in series for eg418kpv PV input

[Jdcarrol]

Hello, for the 3pv inputs which have a max of 600 voc, I’m having a hard time correctly finalizing if I can run 12 or 10 in a series, let me attach an image of our panel data sheet.

I understand for ambient temperatures down to 31 degreees I multiply voc by 1.10.

That electric guide was assuming the base rating was done at 25C. My data sheet looks like it’s providing numbers based on 20C, so do I not need to use such an aggressive multiplier? Difference is 10 vs 12 panels.

@FilterGuy

 

[sunshine_eggo]

49.9V is the relevant number. STC is 25°C

12S is right out.

At freezing your 10S panels will be at 53.5Voc. (-25°C * -0.29%/°C)

11S is possible, but I would hesitate.

 

[Jdcarrol]

Ok….i won’t push it.

 

[FilterGuy]

I understand for ambient temperatures down to 31 degreees I multiply voc by 1.10.

Just to be sure..... are you saying 31F is the lowest you ever will get? That is -.6C. that rounds to -1C.

My data sheet looks like it’s providing numbers based on 20C,

The 20C is from NMOT. You must use the STC value (25C).


The Beta for your panels is -.29%/degC. That works out to a multiplier of 1.075.

With a STC Voc of 49.7, the temp adjusted voc is 49.7 x 1.075 =53.18 12 panels would give you 638V