I have a multiplus 12/3000/120 and I'm looking to setup the two signal BMS assistant. I have three questions.
1. I've seen it mentioned that you have to use Aux1 and temp inputs, but when I load the assistant, I see you have the option to use Aux1 and Aux2 (though default is temp). Can I just Aux 2 and still use my temp sensor?
2. I have a Clean Power Auto MiniBMS 7 that has a main normally open contactor that will shut off the entire battery as well as two outputs that are designed for a normally closed relay. So I think I should be able to connect the BMS to the multi and configure it to be closed to turn off the charger (battery full) and turn off the inverter (battery empty). However I'm not sure about feeding 12v to the Multiplus as I've read in other threads it's not recommended. Any suggestions?
HVC turn on – 3.6V per cell
HVC turn off – 3.45V per cell
LVC turn on – 2.9V per cell
LVC turn off – 3.1V per cell
In addition to voltage hysteresis there is also 10 seconds time hysteresis for each threshold, to filter out brief voltage sags/spikes, which could be caused by engine starting or other brief heavy loads.
Cell level protection disconnects the bank if any cell is discharged to 2.6V to prevent battery damage.
Cell level protection disconnects the bank if any cell is overcharged to 3.65V to prevent battery damage.
3. I've heard it's not wise run an inverter through a contactor (which is the main protection for the BMS) is not good. I'm not sure if the inrush current is bad for the contactor (possible welding issues) or the inverter. Would something like this work: http://www.rec-bms.com/datasheet/UserManualPrecharge.pdf and would anyone know if this could be used with other products other than the REC-BMS (not my BMS) since my BMS is switching on the negative? They come in 0.5, 1.5 and 4 second delay versions.