Thank you.
I have a spec in which they want to monitor the battery voltage and the bus voltage inside the panelboard via a switch, which I do not think will be an issue.
Next they want to monitor the charge and discharge current of the batteries inside the panelboard. Discharge being able to read up to 400A (25-0-100mV scale) and charge up to 40A (0-10mV scale) which we (vendor) will have to use Hall device that gar kindly educated me on which I guess will go to a transducer to the ammeters.
They also want a 27-relay and ground detection equipment consisting of 2 amber LED indication and 1 pushbutton. And 1 continuous ground detection relay with an output contact for remote alarm.
The 27 won't be an issue; however, how do you detect stray current when you have several inputs (chargers, batteries) and mulitple outputs (UPS, trip, charge, close, LED, 86's, relays, etc) without getting really complex? I've never seen ground detection on a DC system. Maybe I've never just noticed ...