[RE-wrenches] Voltage Degradation with Uni-Solar laminate

[Rebekah Hren]

Attached is a screenshot of an example calculation from SEI for minimum
modules in series for controllers, similar to Jarmo's but more
system-specific. And fairly conservative because of the 1.2 factor for
degradation over time (which includes voltage drop). Note there are values
specific to the site, batteries, and module - this example was for a roof
mounted array thus the 30ºC cell temp adder.
SEI recommends not going lower than 1.1 times bulk voltage for the target
minimum array voltage  although 1.2 is a good target to start with.

One thing I'd note is that for systems without a generator or other
charging source besides PV the target array voltage should be 1.2
times *equalize
voltage* not bulk voltage. And of course a maximum modules in series calc
has to be done too.

[image: Inline image 1].

Cheers,
Rebekah

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