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alda avatar image
alda asked

3x us3000c - is one power cable enough?

I have 3x pylontech us3000c connected. Connection is done by one original pylontech cable. Question is if it's enough? Or how to connect next one cable? Thanks

Alex

Pylontech
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Alexandra answered ·

@Alda

What is is it running?

You can daisy chain the batteries (short cables come with each battery) and the cable is rated for 100A so is just a little short of a 5kva if running hard.

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alda avatar image
alda answered ·

actualy I have like this :

20231012-180818.jpg


so to be sure I must do it like this ? :

19872-batteries-to-busbar.png


means add next wires on the place where is cap now ?


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19872-batteries-to-busbar.png (710.5 KiB)
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kevgermany avatar image kevgermany ♦♦ commented ·
No need, as long as your loads are within the cable rating.
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alda avatar image alda kevgermany ♦♦ commented ·

BMS set a charge/discharge limit to 111A. I have a multiplus II 5kW so I think discharge isn't a problém, but for charge I have a mppt 450/100 and 250/60 so charge can exceed 100A

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Alexandra avatar image Alexandra ♦ alda commented ·
@Alda

You will find the batteries will limit the charge current within the system.

You can, in DVCC, set the max charge current to be a max of 100A to be sure.

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beat avatar image beat Alexandra ♦ commented ·

@Alda


Indeed, @Alexandra 's tip is right, but please note that the DVCC maximum charge current setting will, as specified by Victron, not be respected if you have ESS and grid feed-in active in the ESS settings.


So, if you do exceed 100 Amps and do grid feed-in, I would recommend using more than one set of cables, and wiring them like you proposed seems fine for 3 batteries (except for fusing).


Also make sure to not enclose "nicely" the Pylontech wires in tubes or shafts, as the 100 Amps rating is only for wires in open-air to cool efficiently (IEC installation method "E").


Btw, Pylonthech also specifies in their latest manuals that external fuses or circuit breakers capable of interrupting 15'000 amps short-circuit current be used (and MaxiFuses are not enough have only 1'000 amps ICU, I ended up using industrial HPC DIN00 fuses (DC specified ones) and 3-phase fuse-holders for that, only for the + side, as datacoms grounds are connected to - on Victron side).


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alda avatar image alda beat commented ·

fore fusing I'm using this 6way holder https://www.victronenergy.com/dc-distribution-systems/fuses-and-fuse-holders with 125A Mega fuse. When I will use second cable set, I want go down to 100A or 80A fuse per cable.


edit: but HPC DIN00 fuse is really big industrial fuse. Is there other one with holder for personal use ?

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