I have just modified by ess system (multiplus 2, 2 mppts three pylontech 300s and 4,5kwh of panels) to feed hot water from ac2.
At present AC1 is not used and the whole system has been operating up to now on ac power in.
Power is monitored with an Ac clamp around the tails coming in and this has worked beyond expectations in accuracy as far as power consumed by the grid.
I wanted to have an automatic water heater though to use acces power when the batteries are full but I wanted to be able to overide this so, this morning I programmed the Relay switches from the cerbo to operate the relay on the multiplus. (I had previously hard wired relays 1 and 2 at the Cerbo GX to the corresponding relay 1 and 2 at the multiplus.
I ran two scripts to turn the ac2 relay on and off and uploaded that to the multiplus.
I tried the new system, switched on the relay via my phone, heard the relay close on the multiplus and the instead of using solar power from the roof or the batteries it just drew power straight from the grid.
I then switched of the hot water cylinder, and then switched on the relay ( so knowhere for it to feed to and it seemed to turn off the mppt’s disregard the batteries and draw again only from the grid.
Clearly I have done something wrong, but the system works beautifully without ac2 energised and draws only from the grid when it is…
Hi, Welcome. You made it
Could you add a higher resolution image, zooming it in makes it unreadable.
There may be a 50, 75 and 100% option at the bottom of the preview when you load it.
Your config file looks fine as per pylon requirements, though for 3 x US3000 your amp hours don’t seem right, but I may be having memory loss.
I am not sure how the system behaves without AC1 connected, only AC2 is unconventional.
So, I suggest:
Check the DCL of the Pylon via the GX battery tab - parameters, or the advanced widget in VRM. Worth checking it hasn’t dropped to 0.
Try removing the programmable assistants and see if there is any difference.
Failing that, do a test on AC1.
Bottom line, the multi can supply parallel loads via CT and critical loads via AC1 and non-critical on AC2. I have queried the lack of use of AC1 with the group, not something I have personally tried.
Unlikely.
Is there any chance your switch or soft switch is set to charger only?
Not sure if it could feed parallel loads in that mode but checking is free.
Attach a screenshot of the vebus state and alarm/error widgets please.
Do you know, you might have hit on something there. When I switch on the ac2 via the dashboard terminal it in effect goes into charger mode, that is turned of the DC to AC part of the inverter and just pulls in power from the grid. I did another test and when you do the switch the MPPT’s power down.
