Before I start I want to say I've read through quite a few posts already where folks are describing negative DC loads, however I have not found anything that quite explains what's going on.
Some background on my setup: I live off-grid and run my home off our solar/battery setup. I recently switched over to a new 48V battery system I build, we have all new hardware, Multiplus II 48V, two victron charge controllers, smartshut...etc.
I see negative load on the DC side (indicating a charge coming from DC). This is odd as other than our charge controllers we have no other DC charging sources. However if we have a large AC draw (3Kw when running our well pump) DC load spikes to around 100-200W.
I'm perplexed because I never saw this on our previous system. What could be going on? Below is a schematic of our system:
During the evening (no solar input):
During the day (solar input/net positive load to battery)
I am using my own graphing system but my Venus device displays the same data as well.