I have a watchman core and expansion board controlling 2 cell mate k9 which will monitor 2 parallel banks of 16 cells each. So I see on the chart view 32 cells. (#1-32).
Can I setup the watchmon core to control one relay on expansion board if one cell #1-16 drops to 3v. And also setup the watchmon core to control a different relay if one cell #17-32 drops to 3v.
Or do I have to have 2 watchmon core?
Thanks for you support.
Hi Magneticpwr,
Thanks for posting! Welcome to our forum 
For now you will need two WMC, as the WMC is in charge of the control logic, but since we are seeing more multi-string or HV systems, so we are working on new hardware to solve this problem.
If you have not built your pack yet, I suggest putting your cells in parallel instead of multi-string:
Thanks, I have 32 300ah cells. I am looking for redundancy, backup, and safety.
I have 2 80amp charge controller to charge the batteries.
Should I use a watchmon core, expansion board, cellmate for each battery bank as 16S1P.
Or am I better off setting up as watchmon core, expansion board, and 2 cellmates. Connect batteries as 16S2P . 2 16 cell banks in Parallel and use the watchmon core to isolate or shutdown an individual bank if there is an issue such as over charging or when a cell hits 3v.
Thanks
Just to clarify, in reference to the diagrams I posted above, do you mean [2M|16S|1P] or [16S|2P]?
If you want redundancy, yes you will need 2 of everything. Could you elaborate on your needs a little more as to why you need redundancy? Are you completely off grid?
@James, thanks for answering to that.
Indeed it’s a LONG awaited feature to have the WMC control more than one relay depending on certain conditions.
Like @Magneticpwr, a lot of users in Europe are having multiple K9s with multiple 16S battery banks.
In case of any issue/failure, the WMC pulls the trigger on one defined relay, separating all battery banks from the bus bar.
Like @Magneticpwr mentioned in his first post, it would be awesome to have one WMC with its control logic being able to pull relay 1 when failure at cell range 1-16, pull relay 2 when failure at range cell 17-32, and so on.
Most European DIY guys like me run a TE Kilovac EV200 (or an ABB breaker with shunt trip) attached to the WMC relay.
Hope that helps to understand the idea/wish behind it!
Cheers,
Sebastian
Yes, like Sebastian also said. If there is a 16S bank fault we could isolate that individual bank and not have to shut down the whole system.
