PV string voltage exceeds MPPT upper limit of 550 Vdc.
Common causes
Too many panels in series — string voltage exceeds 550 Vdc at low temperatureMPPT1 and MPPT2 inputs connected in series (installer error)String design not checked against cold-morning Voc
What to check
STEP 1
Measure open-circuit voltage of each string before connection
STEP 2
Check string design — Voc × 1.13 temperature correction must remain <550 Vdc
Escalate if
Voltage within spec but fault persists — contact Anker support
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