I want to be able to disable the Multiplus II from charging the battery when the Generator (Additional Inverter Supply) is running.
Assistant Trigger: Generator starts above 3.8kw of load for more than 10 Seconds, and stops when load reduces to 2.5kw.
During the daylight the “Generator” is unlikely to run, as I have 4kw of AC coupled Fronius and 15kw of dc coupled (MPPT 450/100 x 2) solar. So when the AC coupled is up I need the MPII to be charging the battery with the excess.
(please note this has been amended from original question, as a change of plan on how I use my 2 x 48/5000 MPII is likely, due to voltage instability)
Looking for some assistance with the settings, I believe I now know how to make this work with assistants in the MPII rather than Node red.
Note: This has been setup as Off Grid so ESS is not used. This is still in the planning stage not the commissioning stage at this point.
So… the MPII closes the relay - starts the Generator at 3800watts load (on MPII) for 10 seconds using the “Generator start / stop” assistant.
Question: will the MPII then go to full bypass and run the load directly from the Generator ? or will it “ASSIST” the generator to supply the load ? Is this a combination of the “UPS” function on the “Grid” tab, and the “Power Assist” if this is the power assist, what should the factor be, the default is 2?
To disable the charge function, the second assistant would be the “Charge current control” using an input from the Generator to the Aux 1 to set the charge current to Zero. Then reset to 70Amps when the Generator goes off.
Complication: On the AC output of the MPII is a fronius AC coupled Solar inverter capable of 4000w to comply with the Factor 1 rule, currently this unit is controlled via freq shift, it has a Lan cable which goes to the Cerbo GX, and all data including the serial number and firm ware version is displayed on the cerbo GX, so assume coms is good.
So the House load would need to be above 7800w when the Fronius is in full sun for the generator to be called (happens occasionally), or a cloud passes over the Solar it drops its output, the MPII tries to make it up and as such the Generator would be called upon.
Question: What happens when the sun comes back out from behind the cloud, and now I have the Fronius pumping 4000w, the MPII pumping 4000w, and the Generator maxed out at 4000w, with a 7800watt load (or more). I assume the MPII cant frequency shift at this point, and the Generator shut off is 60 seconds below 2800watts. Same scenario for a Kettle or the AC cycling on off etc. how would this be best dealt with or in your experience does the system handle this fine? Generator comes off load MPII unloads, handing the bulk over to the Fronius and just making up the difference until the timer runs out.