I have my bluesolar MPPT 75/15 controller (and ve direct usb dongle) in my campervan behind my drivers seat. Solar panel on the roof to PV in on controller, battery in put to positive and negative on battery under my seat, and load wired up to my leisure accessories fusebox. All polarity correct and It has been working great till around the recent fw update and I have had bizarre behavior since. :(
Issues are:
1) controller goes off at night, no leds lit, and subsequently load goes off (load is set to always on) my battery is reading 13.02v directly and at the screws on the controller.
2) in the day, when its back on, the voltage on the battery on the controller reads mismatched values like 3.53v and sometimes 0v. At the battery (2 meters used) its over 13v and on the controller screws
3) Also no charging seems to happen, no float voltage or charging routine on the battery (charging enabled on software)
4) Load was set to always on, I since disconnected unit to give it a 'reboot' and powered it back up (correct wiring order of load, battery, then solar). I tried with battery life setting also and I would get a voltage pulse of 6-12v on my load circuit (ceiling lights would flash!)
As a result, and needing power at night, I have removed the battery in + and put it on the same feed as the controller load + (distribution nut, not directly in the controller), as a result I now get power (no longer feeding off load) but also In the morning I noticed everything working as normal (bar the controller is now wired wrong, no + in on battery) so the charging routine is working, pv is measuring high watts when its charging and finally the float voltage is being applied. I've reset the settings to default and no change and also the 20a fuse is intact. Thanks for reading!
