To Next Page

To Previous Page

4.4.2 String Sizing

When solar modules are put in a series string, the voltage multiplies times the number of modules and the

amperage stays the same as each module.

For example: Using solar modules that have a 40 Voc (77ºF) with an amperage of 10 Amps (Imp) - 10 mod-

ules wired in a series string would have a Voc of 400 VDC (at 77ºF) and a string amperage of 10 Amps.

When the temperature lowers the voltage can rise above the maximum allowed by the inverter and dam-

age will result.

CAUTION: To determine how many modules you can have per string; first verify the lowest possible ambi-

ent temperature of the installation location. Next, find the rated Voc, Vmp, Isc and Imp of the solar module

at 25ºC and the temperature coefficients for voltage and power. Then calculate highest possible Voc for

the entire string when the ambient temperature falls to the lowest possible ambient temperature upon

sunrise. To make this calculation, use a string calculator or consult your solar designer or solar electrician.

DANGER! -DAMAGE WILL OCCUR if the string voltage on a cold sunny morning exceeds the inverter’s maxi-

mum input voltage of 600V!

Other manuals for EG4 18KPV

Questions and Answers:

Need help?

Do you have a question about the EG4 18KPV and is the answer not in the manual?

General