The Daly-Antra types of BMS (Battery Monitor Switch) require charging current before they'll turn on.
Unfortunately, most 'smart' inverter/chargers won't turn on until the battery is connected, so guess what happens when a Daly-Antra BMS is used?
Nada. That's what happens when a Daly-Antra . . . .
They supply a Blue-Tooth dongle that plugs into their UART port, for remote monitoring. This has a press-button that allows the BMS to 'start'.
The BMS isn't a source of energy, in itself - cannot generate a fault condition.
It's supposed to react to low/high voltages on battery cells, or overcurrent on charge or discharge. What it's NOT supposed to do is complain if there's no charger present.
A manual on/off switch might be a useful feature, but this BT dongle addition only works the one way and it doesn't remember what it's supposed to do, though there's always power supplied when it is supposed to function.
A USB connection is provided to talk to a PC, to set/adjust monitoring limits. It uses the SAME UART port as the USB dongle. See the problem there . . . . ?
RL