System has been installed and working perfectly for about a year now. However, a few weeks ago after the battery bank was fully discharged once, now the bmv will not show any current or load, positive or negative, despite DC or AC draw occurring, or when connected to shore power.
Pic of the BMV showing now draw positive or negative (appliances are on):
The MPPT shows only a small current coming in. Also, the solar doesnt seem to take in more than 20 watts or so at any given time, even under addition load that I think would call for it. Pic:
When I turn on a load, like the DC LED lights for example, the voltage on the battery bank drops significantly for a short period. See pic of LED lights turned on and voltage drop for a few seconds:
When I do the same for a more significant load, like the maxxair fan, the voltage drop is more significant and lasts a bit longer before stabalizing (60-120 seconds).
Keep in mind no changes to the wiring has occurred, and the system worked perfectly for a year. Could the mppt have gone bad or the BMV or both due to the full discharge cycle that occurred? The batteries are Lithium from Battleborn. Could the surge on the batteries when applying a load indicate damaged batteries?
Thanks in advance