7. Frequently asked questions
Q1: I have disconnected the VE.Bus BMS V2, my inverter/charger will not switch on; why?
If the inverter/charger cannot find the BMS, it will go into an emergency mode. In this mode, the inverter/charger will charge the batteries with a maximum of 5A, up to 12, 24 or 48V (depending on the system voltage). While the inverter/charger is in this mode, only the "Mains on" LED is illuminated. If you disconnect the AC input, the inverter/charger will switch off and will not start to invert since it cannot get verification on the battery health from the BMS. Note that when the batteries are depleted or disconnected, a Quattro will need to be powered from AC input 1. Supplying power to AC input 2 will not make a Quattro switch on and start charging.
Q2: The batteries are empty, and the inverter/charger will not start to charge; how to get the system up and running again?
Connect a small battery charger, for example, a 5A charger, and wait for the battery voltage to get back up to 12, 24 or 48V (depending on the system voltage).
Q3: What happens with the inverter/charger when the BMS gives a low cell voltage signal?
The inverter/charger will be set to "charger only mode", and the batteries are charged when an AC input is available. Should AC not be available, the inverter/charger is off.
Q4: What happens with the inverter/charger when the BMS gives a high cell voltage signal?
The high cell voltage signal will only be given when there are unbalanced cells. The inverter/charger will switch to bulk and starts charging with a reduced charge current. This allows the balancing system in the batteries to re-balance the cells.
Q5: What does it mean when the BMS displays a VE.Bus Error 15?
With VE.Bus firmware versions below version xxxx415 the VE.Bus BMS V2 will generate a VE.Bus Error 15, VE.Bus combination error. This error indicates that the VE.Bus products or firmware versions cannot be combined. Resolution: Update the inverter/charger to a firmware version xxxx415 or higher, if available.