Configuration Help

DIY
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1

Hi to all
My basic system comprises of the following

Venus GX (connected to LAN internet)
Win 10 PC with VConnect v6.17 and VRM setup
MP II 48/5000
EVE LiFePO4 280Ah x16
JK-BMS B2A24S300P
SS MPPT 85A - 200W PV x28
All off-grid.

Everything is working fine with the above and this small system only gets used overnight from 22.00 to 08.00 hrs then the LFP battery recharges from solar during the day. I could do with more charging and I have a much larger system in the same building that has surplus 230V available most afternoons. I am thinking to use the Multi 70A charger to help charge the LFP battery from the larger system and wonder what the easiest way is to automate this process.

I require the MP to invert only from 22.00 to 08.00 hrs.
I then require the MP to help the solar charge the LFP battery whenever AC 230V is present at the AC input but with a couple caveats. a) only between 08.00 & 22.00 hrs when it is NOT inverting. b) Does not pass AC through to the loads, only charger mode.

Sounds fairly simple, TBH I am slightly overwhelmed with all the possible combinations but just looking for the simplest approach using relays, assistants, etc.

Any guidance much appreciated

2

I do something similar with a double off-grid system. I just use tasmota-plug that powers a charger to give extra charge to the 2nd system. I control that plug using Node-Red. Do you have Node-Red programming skills? It is fairly straightforward to use MQTT to collect all data (P1 port data, battery SOC info and so on). And write a function to descide based on the conditions.