I notice we see these dips while we charge our solar. We have 9x170 and 150/100MPPT and 8x100Ah Battle Born batteries.
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I notice we see these dips while we charge our solar. We have 9x170 and 150/100MPPT and 8x100Ah Battle Born batteries.
This looks like the typical behavior of the Battery side reports, please check if the PV Yield shows the same, then there might be an issue.
I have the same behavior with my own site, as I have a refrigerator that cycles every 20 minutes or so on and off. It has identical drops on the battery reports (both voltage and amperage), because I am putting less power to the battery, but the PV Yield remains steady.
Here is a bigger picture, I’m going to make sure a tree isn’t shading in the morning vs afternoon sun. No appliances are on.
I was understanding that this was the MPPT sweep that the charge Controller does. I believe I read that it does this every 10 min as your showing on the graph.
This is likely the issue. I have the same 150/100 mppt and a smidgen more pv, but charging 48V. Nowhere near as pronounced, but it occasionally arises where I get 2 or 3 (10 min) downspikes in a row. Surprising to me to see them last so long as to be picked up by VRM per-minute monitoring so regularly, like every 10 min without fail - suggesting each mpp sweep is taking longer than a minute?
Then again, I suppose it's possible that the timing correlation is coincidental..
Maybe the 12V batts is the difference from mine, maybe the panel stringing (I've 9x 195W in 3S/3P configuration).
I don't want to clog the thread with my screenshots, but can provide if asked. Not as spectacularly though.
Had a rethink as to the importance of this. It's probably not, but does 'foul' the vrm graphs. If it's happening every day, perhaps a shutdown of the mppt for 30 sec might misalign the timing. The length of the scans should be detectable from instantaneous readings. If too long, maybe even a fault in the unit.
The MPPT has a voltage and amperage limit indeed, but a total wattage of your panels too.
in my opinion, you have too many panels for 1 single controler hence it is disconnecting.
Depending in your battery voltage (12-24-48) the W limit changes but It is still far less than 9×195 ! Check the mppt manual for the correct limit.
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