Greetings fellow Victron fans!
Would love to hear your inputs and possible fixes for the following scenario:
He is litterally end of line in the mountains and this is the state of AC input 50% of the time.
Setup is:
How would you tackle this scenario to keep batteries charged when AC is half decent and provide some stability for appliances?
Have a great weekend everyone!
What does the energy supplier say? It’s well out off specification.
You would need e.g. 3 AC - DC chargers e.g. from Eltek … They work in a very wide AC range.
The multis all switch off from their 3-phase connection.
They even ran a new line for him but he is literally on a best effort basis. Just too far and a new transformer is not feasible for just one customer. Unless he agrees to support the cost of over 100K euros, given this is a mountain area.
There isn’t a grid meter fitted yet as all grid runs through inverters.
Would you have a model number or link?
https://www.eltek.com/products/flatpack2-483000-he
They are also available in 19 inch housings or used
or
MEAN Well RSP 3000 48V
or
Huawei R4850G2
That’s 3 large MPs. What is the intended load? If the voltage is that low already, what does it drop to when you connect say 2kW kettle, or an oven, or both on a single phase.
If you dont need 3 phase in I’d be tempted to request single phase on L1, which would enable the supplier to double up the conductors, assuming you’re star fed.
It doesnt make much sense that one phase is that much higher at no-load. That can only happen if the source transformer is too small and your neighbours are pulling power.
These are even 15000ér Quattros !
Can the grid supplier deliver this enormous power to the end of the supply line?
There is a heat pump on load side. Forgot to mention there are 50kw solar panels and a Fronius Tauro. During the day there will be no issues. Trouble is how to use this poor network during night to get at least something out of it.
Needed to run a heat pump and the 50kw panels AC coupled on a Fronius Tauro 50kw
then you could use the AC - DC Chargers only if your Quattros are disconnected from Grid …
What is your Charge Current of the Quattros from the grid
Believe it or not the main circuit breaker is 100A. 
then you have around 80A Current … or more ? / or less ?
Yes, during the day when voltage is fine over, 80A can be used per phase.
Then the priority here is ALWAYS charging the batteries to supply the load or to be able to continue working OFF-grid if the grid fails and let the PV inverter work …
Yes, that’s exactly what we want. However, the low AC cut-off is 181V. Meaning the whole AC IN is turned off. Wonder how to work around this?
Then the small 3kw chargers per phase would be far too few. They could be cascaded as in telecommunications technology, but that would be infinitely expensive
A generator would almost be better … because they are quattros anyway
There are Rackmounted Sollutions with up to 30kw per phase … 
