Trace battery temp comp in grid intertie [RE-wrenches]

[Doug McCorkle]

Hello all, just a reminder about something I don't remember seeing discussed
recently.  We were checking the shop system (temperature about 50-55
degrees), and noticed no grid sell-back on a nice sunny day.  Turns out that
due to the cold temperature the SW4024's temperature compensation was
increasing the float voltage so the batteries were above the PV charge
controller's float setting, thus the charger was blocking the current.  Two
workarounds are to adjust the SW's float value down or disconnect the temp
sensor.  Just another minor detail to remember to avoid the intertie being
even more inefficient!
Doug McCorkle
SunnySide Solar
Guilford, VT

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