Dear community members,
this might be a bit of a weird set-up or maybe I am just overcomplicating things. Anyway, thats why I am here, to ask for your opinion.
Let me quickly walk you through what I have planned (to be installed this winter): I have three holiday houses that are all physically connected to each other and have three separate power grid connections, each of them with their own earth rod, PEN bridge and meter. All three houses are used during summer period with some high consumers (Air Condition / Pools + Heating) and only one house is used in winter (I live there myself) with mainly lights / computers / kitchen / some Air Condition heating.
I would like to install a 5.4kWp system with a Multiplus II 48/5000 and a 10-15 kWh LiFePo4 battery which can fulfil my requirements for summer and for winter.
Each house has its independent basic loads such as lights / kitchen (occasional use only) / outlets / pool (if applicable), however there are some other loads that are somewhat distributed. The two Air Conditioning outdoor units are connected to House 1 and 2 while the common Water Heater is connected to House 3.
In summer, I would like to run these high consumption loads as much as possible on solar / battery. Since the Multiplus is being fed by the AC-In of House 1 which can not handle all loads including its own basic loads (kitchen, lights, outlets), I need to design a system with automatic transfer switches in order to change the power source of each of the consumers to its original grid / house in case there is not enough battery / solar power available or the inverter fails.
Do you guys think this is the most viable solution? Is there something I am missing?
I am happy to receive your feedback,
Sebastian
Update:
Since people misunderstand my question: I am NOT trying to combine three grid connections into one. I am trying to simply switch consumers back to their grid connection in case solar/battery power is not sufficient.
I am simply interested in understanding if there is any other system design on the