Guru
Joined: 13/10/2014
Location: AustraliaPosts: 2260
| Posted: 10:56pm 15 Mar 2025 |
Hi Mike, that's never left on as I have remote switching via a big Relay AC relay, the dc coil is controlled via a mechanical on/off switch and small PSU, however I did wonder if the pressure controlled Water pump had come on and possibly shorted / failed, but everything was fine and switching all loads off still tripped another breaker with Mains AC, after the 3rd trip the short disappeared.
But even allowing for all of that, nothing could pull over 63A from the AC line for 6 minutes except a partial short (equipment burning up) or some organic matter across the AC lines somewhere.
Everything has been running for 24 Hours again with max power around 6kW, if everything aligned to run at once, worst case would be around 10kW to 12kW, not including startup surges, but 17kW for 6 minutes?? external monitoring confirmed that, followed by the Inverter C63 AC Breaker tripping.
I now believe from looking at the logs, whatever was drawing the extra 10kW suddenly shorted and the Breaker, already under stress, tripped instantly BEFORE the Inverter DC tripped.
When I reset the breaker the first time under Inverter AC, Inverter DC input current was heading north of 800A, and this time the Inverter tripped with both power board DC input trip LEDS lit and the AC Breaker also tripped again.
One thing for sure, the DC protection works and the available power and load sharing on this Inverter design is impressive.