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I’m using dbus_serial_battery running on VenusOS on a raspberryp4 in conjunction with a Victron SmartSolar VE.CAN 250/85, two JKBMS PB 48V battery banks, and BMV-712 Smart meter. I believe the system is running well, however I’m trying to understand the charge controller state as indicated by the lights (blue-bulk, yellow-absorb, green-float) and the GUI device history, vs the current/voltage levels being maintained by dbus_serial_battery. My problem is that, although the voltage/current levels progress from bulk (constant current to MAX_CELL_VOLTAGE), to absorption (MAX_CELL_VOLTAGE maintained for MAX_VOLTAGE_TIME_SEC, current drops to very low levels) and then the voltage drops in a slow exponential towards the FLOAT_CELL_VOLTAGE with current varying at very low level +/- to the batteries. However, the state indicated goes from bulk to absorb, but never reaches float. I have GUI additional info enabled, and in the --switch to float requirements (Linear Mode)-- what I see is that as the time_diff reaches MAX_VOLTAGE_TIME_SEC, the max_battery_voltage starts to drop slightly below the voltage_sum (it actually varies right around the max_battery_voltage level), and then the time_diff resets to zero and allow_max_voltage changes to False. As a result, though the charge behavior is correct, the device never enters float mode. The cell differential voltage never gets over roughly 5 mV. I’ve attached my config.ini file, pertinent values (I think) are as follows: Any help would be appreciated. |
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No answers, so I'm drawing my own conclusions. The Venus GUI (Parameters) shows "Float (Linear Mode)", however the light on the charger stays in absorb mode (yellow), so I'm assuming the float mode light indication doesn't work with the dbus-serialbattery extension. As mentioned above, the charge levels seem to be correct regardless. |
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The Victron devices never sync with the battery state, they chargers only adapt the charging voltages (CVL). Just ignore the bulk/absorption/float indications of all chargers, if your battery is controlling CVL. The charging mode is only dbus-serialbattery internal.