MyMidnite2 and SOC

[mjp24coho]

Upgraded my charge controllers to the new Firmware, and was excited to see the ability to monitor SOC, among other changes. However, after 3 days of monitoring since the upgrade, I've noticed that SOC is constantly at 100% - it never goes down, even through the middle of the night.  Any ideas as to why it's giving what appears to be a false reading?

[Westbranch]

tell us more about your daily charging and use...

[TomW]

Just to be clear.

You need a WBjr in the circuit to get  the proper SOC value.

In case you don't know that.

Tom

[mjp24coho]

I have the WBJr installed.  The system is used for my offgrid cabin - currently not really in use until the spring.  I have some monitoring equipment in use (cameras, wifi, various sensors, satelite internet, etc) that draws about 50W continuous.  I'm currently getting 3-4 hrs a day of float - 2000+W of panels, 24V 800 AH bank, 6+ hrs of sun per day.  But when I check the system early in the morning before the sun rises, the SOC is still showing 100%.

[Westbranch]

OK, couple of things, did the SoC drop before you upgraded the FW?
what is the SoC after a day of no or little sun?
do you see the NET Ah with a + symbol above the SoC display of the L APP? it seems to bleed off that first  in my setup.
what are the other loads after sun down when you are there? 

[dgd]

I have the WBJr installed.  The system is used for my offgrid cabin - currently not really in use until the spring.  I have some monitoring equipment in use (cameras, wifi, various sensors, satelite internet, etc) that draws about 50W continuous.  I'm currently getting 3-4 hrs a day of float - 2000+W of panels, 24V 800 AH bank, 6+ hrs of sun per day.  But when I check the system early in the morning before the sun rises, the SOC is still showing 100%.

Are you sure that the only thing connected to the battery negative is one side of the Deltec shunt?
Nothing else such as DC loads, inverter etc JUST the shunt?
Then all negative connections only go to the other side of the shunt, via a neg combiner bar or whatever

dgd

[mjp24coho]

DGD - I believe all the DC negative loads are connected to the other end of the shunt.  I use a Midnite pre-wired epanel with a Magnum inverter.  Now that I think about it, the side of the shunt that the WBJr is connected to also has the Magnum battery monitor attached to it.  If I recall, the instructions for the WBJr included steps or that setup.

Westbranch - the SOC is a constant 100%, any time of day.  I can't access the local app from my home, and I likely won't be back to my cabin for another month or two.  I'm also drawing the same loads all day 24-7 - cameras, wifi, satelite internet, data monitoring equipment, etc.  It's a constant 55W draw.

[Westbranch]

Are you using My Midnite? with the internet on 24/7 you could be...no?

[dgd]

DGD - I believe all the DC negative loads are connected to the other end of the shunt.  I use a Midnite pre-wired epanel with a Magnum inverter.  Now that I think about it, the side of the shunt that the WBJr is connected also has the Magnum battery monitor attached to it.  If I recall, the instructions for the WBJr included steps or that setup.

OK, at the risk of asking the obvious..
The purple wire from the WBjr is connected into the AUX2 port of the Classic, actually in the leftmost of the four tiny screw connector block below the temp sensor socket?
In the setup menu on the Classic's MNGP screen the AUX2 port is set up for WBjr connection and it is enabled?
and to repeat.. When you look at the shunt there is just fat cable connected to one of the large brass bolts and that large cable goes to the battery negative. And there is absolutely NOTHING else connected to the battery Negative of that large brass bolt?

dgd

[mjp24coho]

Yes - I'm using MyMidnite with the internet connected 24-7.  The purple wire from the WBJr is connected in the AUX2 port of the classic, and on the Classic MNGP screet, the AUX2 port s set up for the WBJr connection (enabled).  And nothing else is connected to the battery negative of the large brass bolt.

[dgd]

OK, so all the hardware and connections are good 
Its something of a mystery then, why you always see 100% SOC even after an overnight discharging via your base loads. It sure seems something is not right.
I don't suppose you have any way of monitoring the actual reported current flow through the shunt so that you can verify the WBjr is really seeing the charging and discharging current?
That other current monitor you have connected to the shunt, does it have a digital readout or report via some other display (on inverter perhaps) or via a web page?
Any chance of a photo of the shunt and WBjr  and the other monitor attached to it?
Do you also see the flashing green led on the Wbjr actually flashing every second or so?

dgd

[Westbranch]

Are you getting any data from the Magnum monitor?

[mjp24coho]

I'm getting data from the Magnum monitor, but it's SOC isn't working either.  As for the other questions - I'll have to wait until I'm there in another month to look into it further in person.

[Westbranch]

MPJ the wiring setup should look like this around the shunt... the RED and BLACK vertical wires go straight to the Battery... pic taken while wiring things in, a bit more cramped now with WBjr and other wiring