December 18, 20223 yr I installed a 5kw Synapse (Axpert) inverter yesterday and now have a very strange issue with the pv panels. System is 5kW Synapse with 1 X 5.3 Weco Battery 48v and 8 X 545w panels wired 4P2S The system works fine except solar feed acting strange. Panel Voc is 90volt and when i switch the pv dc breaker on, then as soon as the inverter connect pv, the pv voltage drops to 50v (Battery volts) and 3/4 seconds later the pv cuts off on the inverter. 10 seconds later the cycle starts again...pv connect and voltage drops from 90 to 50 and after a short time cuts out.This happens at early morning as soon as sun comes up with just about no pv current only supplying 20watts as well as at full sun with pv at over 10 amps - 2000 odd watts. I suspect the drop to 50v causes the inverter to kick out due to low operations Volts (60-110v) and restarts at 90v after reset.? What baffles me is that it is not current dependent and i have tested with panels diretly connected to inverter. Can this be a faulty inverter?
December 19, 20223 yr 14 hours ago, TjObie said: Can this be a faulty inverter? Is it perhaps a PWM model, not an MPPT model? The Synapses seem to be (or started out as) Axpert work-alikes, and some Axpert models are PWM. Axpert PWM models typically quote the max PV voltage as 105 V though. But it could also be a faulty MPPT model, with the buck transistor(s) shorted. It could just be infant mortality (leading edge of the bathtub curve). If so, it should be replaced or repaired under warranty.
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