Saturday, I updated my Quattro II (24/5000/120, 230V) from 4.94 to 4.96 with the VRM/Cerbo remote upgrade procedure. After upgrading everything worked fine.
Because of some maintenance on the system on Sunday, I turned the Quattro on and off several times. But now it starts up with Low Battery LED and stays in Passthru-mode. Charging and inverting is not possible anymore. Tabular plate batteries are in good condition and fully charged (25,5V measured by Quattro battery monitor and Smartshunt).
The Quattro works in a system together with a Cerbo GX, Digital Multi Control and Smartshunt 1000A. All running on the lastest firmware.
I tried the following (with no luck):
- Started system with no load on outputs
- Checked battery connections, measured 25,5V with a Voltmeter on Quattro battery terminals
- Quattro off, batteries disconnected and connected again, Quattro on
- Removed ESS-assistant with VE-configure
- Removed DVCC in Cerbo-menu
- Changed Grid-country and set to 'no grid'
- Activated the Quattro battery monitor in VE-configure
- Set Cerbo to use Quattro battery monitor instead over the shunt
- Set Quattro to default settings with VE-configure
- Started Quattro without Temp and V+ sensors
- Replaced the UTP cable between Quattro and Cerbo
- Started Quattro without VE-Bus-connection (Cerbo and/or Digital Multi Control) **)
Any help, any clou would be appreciated. The alternative is sending the Quattro II to the dealer, but i can't affort to miss the unit for a long period.
**) Some strange occurs while doing the last action: the Quattro won't start at all with the Digital Multi Control disconnected and the Cerbo connected. LED Overload gives a short flash, then the LED LOW Battery is on for a second. Then a multiple seconds no LED's, and then it repeats itself.
So rolling back the firmware to 4.94 isn't possible anymore, because I have no MK3-cable and for new firmware the Digital Multi Control needs to be disconnected.
