10. Clamp onto one of the DC cables with a multimeter from the PV module to measure
micro inverter current. This will be under one Amp if AC is disconnected.
11. Verify the PV module DC voltage and current is within the allowable range shown in
“Specifications” on page 20 of the manual. (YC600/QS1)
12. Swap DC leads with a known good, adjacent PV module. If after checking the EMA
periodically (this may take up to 30 minutes), the problem moves to the adjacent
module, this indicates that the PV module isn’t functioning correctly. If it stays in place,
the problem is with the microinverter. Call APsystems Technical Support for help in
reading the microinverter data and for help in obtaining a replacement microinverter, if
needed.
13. Check the DC connections between the microinverter and the PV module. The
connection may need to be tightened or reseated. If the connection is worn or damaged,
it may need replacement.
14. Verify with your utility that line frequency is within range (some multimeters have a
frequency function to check this easily)
15. If the problem persists, please email directly to this response. Please do not reply to
auto-generated emails or emailing support.usa@apsystems.com; not emailing this
email directly can cause your request to take longer to resolve with the possibility of lost
information. Thank you.
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