question

miguel5 avatar image
miguel5 asked

SOC decreases in ESS during excess PV feed in

I'm running an ESS system according to the following picture:

1678822660406.png

PV inverter 6,9kWp, PV charger smart solar 100/50 0,7kwp, Multiplus 12/1200/50, 12V 400Ah LiFePo, Smart shunt 500, Gridmeter EM24, PV meter ET340.

Generally the system works as intended.

But what really makes me wondering is the status "Discharging" combined with decreasing SOC during the phase "DC-coupled PV - feed in excess".

This leads to low SOC values including switch off when reaching my 40% limit while the battery is still above 13,2V = 100% SOC.

So my question is, have I missed a button to correct this behavior or is this a bug?

ESSSOC
1678822660406.png (289.9 KiB)
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

1 Answer
miguel5 avatar image
miguel5 answered ·

OK, easy enough to solve this issue on my own, I attached the Minus cable from the MPPT direct to the battery pole. Now I'm waiting for the right cable lug to connect it to the other correct side of the smart shunt...

Another case of RTFM

2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Related Resources

Additional resources still need to be added for this topic

What is ESS training video

ESS Quick Installation Guide

ESS design and installation manual