Expandable Off-Grid Shop System Design

[inetdog]

You want to keep the string voltage and current within 5% of each other. If one string is much different than the other strings it could affect how the whole system performs.

Think of the solar array like a chain. It is as strong as the weakest link.

Actually, if you are going to parallel two strings into one MPPT input the Vmp specs for the two strings should be within 5% and the current spec for all of the panels within one string should be within 5%.
If you have two MPPT inputs, some MPPT devices want to see roughly matched power between the two to allow use of the device at its full rated power. Others don't care.

[SunEagle]

Actually, if you are going to parallel two strings into one MPPT input the Vmp specs for the two strings should be within 5% and the current spec for all of the panels within one string should be within 5%.
If you have two MPPT inputs, some MPPT devices want to see roughly matched power between the two to allow use of the device at its full rated power. Others don't care.

Thanks for the clarification.

[ClintK]

If you have two MPPT inputs, some MPPT devices want to see roughly matched power between the two to allow use of the device at its full rated power. Others don't care.

Apparently the Classic charge controllers have a "Follow Me" function where you can have a single Classic control other Classics. Perfect!

Just found the "altE" YouTube videos; very educational!