So I've been troubleshooting my new system and things are starting to come together.
I still have an issue with the integration of my external BMS into the system, but I think that's only a couple of cables away!
Anyway. I'm having issues with the BP65 I've got set up to protect my LiFePo4 battery from the Orion and MPPT. It seems to work fine with my Orion, but when I commissioned my Solar Panels this weekend I've been getting very mixed results.
Originally I think I shorted out my High Pin signal from the BMS, got that short fixed and fuse replaced.
Then I started having issues with the BP going to E1 when turning back on. This kept happening. Eventually I figured out that if I reset the MPPT by turning the breaker off and on it would work OK.
I think there's an issue with inrush current, vs cable length. My charging source to BP IN are less than 50cm, but I hooked up the ground wire to the main neg busbar. So the total neg cable length is probably over a meter, which may well be causing the issue? Also if my MPPT and Orion are off, does that mean the BP is unpowered and therefore off too?
How would I connect the neg differently? My Orion and MPPT negs go down to the neg busbar to connect, so I don't think I can connect to one of them for the BP, as the other charging source negative would effectively be 2 meters away from the BP.
Here's a schematic of my system (the charging system is protected by DC breakers in a DIN rail box, solar panels in (+ & -), Orion and MPPT positive out):