Hope the above photos are clear. I have two battery monitors attached. One ("IN") gives me figures then there is more solar power being produced than used. The other ("OUT"") gives me figures when power is being taken from the batteries.
The wire colours going into each monitor go to the same terminals.
On the battery side, both grey wires go to the positive battery terminal.
On IN, the black wire goes to the battery side of the shunt on the negative terminal and the brown & blue wire both go on the other end of the shunt.
On OUT, brown & blue go on the battery side of the shunt on the negative terminal and the black wire both go on the other end of the shunt.
Thanks Craig. No load coming off the controller (ie, nothing connected the two load ports on the controller).
The diagram on the back of the battery monitor(s) had me confused. I did not know whether to put the batteries as they looked from the diagram at the back, or flip them the other way around, ie, the diagram showed what the connections should look like from the front.
I bought a second monitor so I could have the wires attached both ways to see what happened.
One thing I noticed is that where there is a load (via the inverter) on the system, if there is enough power being produced by the solar panels, the charge bypasses the battery monitor, ie, the battery "Out" numbers don't move, just the "In" ones are not reading higher.
I think the bottom right figure is total power In / Out, and the way I'm using them, hopefully correctly, is to try to make In equal or get close to Out, which I think tells me that the batteries are fully recharged.
There's always at least a small load, 1.1w measured on a 240v plug in adapter, due to the mechanical timer I have taking 1.1w.
I get the top left figure, volts, but the other two figures top right and bottom left, Current and Power respectively, have me a bit confused as to what they mean and how they're calculated. I'll put a picture in the next post showing the figures on the MT50 and the two battery monitors.