Current throttling on battery charging

DIY
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1

Hi,

I have the following configuration at my property:

2 Victron multiplus II 48v 5000 (with one being a GX). These are in a parallel configuration, with the mains power coming into the inverters first before going to the consumer unit(s). I have 40Kw of Pylontech US5000 batteries, so that if we ever loose mains power I will be able to continue with battery backup for a while.

I have 2 car chargers, that when running draw 32A each.

One of the car chargers has a current control device on it to shut the charger down if it detects a specified current being drawn into the property. This can be varied from 32A up to 110A. The property itself has a 100A fuse for the mains supply.

My question is 2 fold:

If I have both of the car chargers running and the batteries charging I will be pulling 96A (which is very likely as I am on a cheap electricity tariff from 23:30 -05:30), if anything else in the house kicks in I could potentially hit the 100A limit. Will the Victron be clever enough to know that it can throttle back on the battery charging (as it knows that it is connected to batteries), to stop it hitting the 100A limit, as it does not technically know what the 64A draw for the car chargers is or any other load in the property?

If this is the case, should I set the current limiter on the car charger to 110A so that it will never cut out and the limit will always be controlled by Victron?

Any comments / advice would be greatly appreaciated.

Thanks,

Graham.

2

Hi,

If DVCC is activated, which it is since you’re using pylontech batteries, it will get the surplus from grid. If you set the input current limit to 100 A and activate power assist on the multis, then it will limit the input current to 100 A, getting the rest from batteries until you hit the DVCC limit.

If you ever have a doubt, rtfm :wink: you’ll probably get the answer by yourself. I hope I did answer your question though :slight_smile: