While this seems all fine and dandy, it’s a shunt, it should know how much came out of the batteries and how much went baxk into the batteries. Why is it not canting Ah? That would come closer to giving a true impression of the system vs making some strange guesses with battery voltages which are not necessarily relfective of the battery at all during the day when the MPPT controllers are running and forcing the voltage based on where they are in the system. Yes, it might say 100% when you are really 96% but that’s a lot better than the default values and the guessing that goes on based on battery voltages.
If you can calculate how much came out (something I’m not sure I trust at the moment since I’ve seen a 3000W inverter pull out 330A from my bank, according to this shunt). You should be able to tell when that number of AH has gone back in (via the shunt) and report the true state of the batteries vs this guesstimate.
I thought it was supposed to be “smart”. It just seems delusional
Absolutely you have losses that show up as heat from the batteries or wires, but when my “smart” shunt knows I’m 300AH in the hole and voltage goes up at the start of charge, it is NOT being very smart at all. Given the knowledge that it has of the system, it should not be saying 100% after 3 minutes of charging and if it detects the balance is “close” and the current drops to 0 and stays very near there, then saying 100% is correct but saying 100% at 8:05am is ridiculous regardless of the other settings. It should be SMART not retarded. I’ve made the changes and was still at 100% before 10am, but the current flow was also only about 1amp so I’m OK with it today, I know more after a week or so, but this shunt is a LONNNNNNNG way from being SMART. Not only that but even with a small microprocessor, the charging voltages should be able to be discerned with some simple time averaging tables and it could configure itself especially right out of the box (not to mention the fact it was in the same BT network with the MPPT controllers and could have asked them for the values and listened to the part of the charge cycle the MPPT controllers were in.
My renogy cost 1/2 as much as this (or maybe less), I got this shunt becuase of the VRM allowing me to monitor the power use and consumption over time. It was called “SMART” shunt but it behaves like a dummy out of the box.
It will work when set up to match batteries. There are inaccuracies in all measurements so there is drift and getting it to resync when full is a known condition. Mine is very close and that is on AGM batteries, typically it syncs when I am >99.5% by Ah counting, sometimes it gets to 100% marginally before a resync. However, if I go several days without getting the batteries full it can drift by a few % and be full at 98%, so the sync closes the gap. It works well.
Well you do have to read the manual, and adjust the settings as per your battery type, and charge/discharge rates.
Given your previous question I think my smart shunt has a learning disability you were given directions to a helpful link.
Also you neglected to specify what type of battery you have. Hence the lack of specific detail for settings.
Most importantly, we are not here as volunteers to give instructions verbatim.
You will be given links to the manuals, helpful posts, or even videos to guide your setup.
If you put a little effort in you can get very accurate and repeatable results.
