Hi there,
I read a lot about erratic overload alarms from multis. I have a caravan installation which was completed (except solar) 4 years ago, while I am still working on some finishing touches.
The installation (details below) has very light use and mostly plugged in, while I am working on the van. Everything is stationary. I had no trouble until now. A couple of weeks ago I had the first overload situation and today again. However there is no overload. The Ac wiring is fine and nothing has changed since the initial installation, everything is protected with double pole circuit brakers. The overload shuts down the system and I cannot restart by switching off/on unless I remove the 12V from the Multies (Ihave contactors for that) and reconnect the 12V. Then the multies are ok again, but I wonder for how long.
Is there a firmware update for this problem. It looks like many people have that issue from what I read.
Here are some details.
2 x Multi 3000 12V 16A in tandem connected with 2x70sqmm cables for plus and minus all cables around 80cm long.
Output is connected with 6sqmm mains cable from each multi to a 32Amp circuit braker and then combined into a 63Amp circuit braker which connects to the main switchboard. I can easily disconnect all AC loads as well as 12V input.
2 x Blue Solar 85/150 running idle, no panels connected yet, will be shortly 20x135W in 4strings of 5, 2 to each solar charger in parallel.
CCGX installed with BMV 702 for the main battery bank.
Batteries are 2 banks of 12V 700aH Lithiums connected via a copper bus from which the multies are fed. The BMV702 uses a 1000Amp shunt.
I have tested the system well beyond the 6KW of the multies while plugged in and it worked flawlessly. I have a hotplate, dual head aircon, inverter fridge, microwave and more connected for test.
I know that the system works and am wondering now if I have to prepare for a major repair. My supplier is out of business and I guess I am out of warranty as well.
To me it looks like a manufacturing issue with all these posts about the problem.
Any ideas ?
regards
Gmd