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jordant2612 avatar image
jordant2612 asked

3 x Multiplus 10000 ii + 1 x Central 15kWh Pylontech

Hello,


Just wanted to double check something.


I am designing a system that is 3 phases 230v L-E and I am proposing putting 1 inverter on each phase and then having a central battery bank of 3 x US5000 Pylontechs.


There will be 3 sets of battery cables going to the Victron Lynx from the inverter ( 1 pair per inverter ) and then a set going from the lynx to the battery.


IS there any reason why this wont work?


Just wanted to double check.


Thanks.

Multiplus-IIPylontechmultiplus in parallel
2 |3000
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2 Answers
nickdb avatar image
nickdb answered ·

Yes, you are grossly undersized on the batteries which can deliver around 240A on a system that could use over 600A.

And that is assuming US5000C. US5000’s have lower discharge specs.

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Alexandra avatar image Alexandra ♦ commented ·
Agreeing with @nickdb on all points.



Also..... L- E as no neutral. Big no to that. That is a delta connection it is not supported.

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jordant2612 avatar image jordant2612 Alexandra ♦ commented ·
Thanks - Yes there will be a neutral there of course.


customer wanted 10kW inverters and 15kWh batteries. So I mean it’ll work it’ll just drain the batteries quick and if he wants more batteries he can.

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nickdb avatar image nickdb ♦♦ jordant2612 commented ·

No. The BMS will protect and the site will go dark. Its not a capacity issue, it’s a supply problem.

Letting an end-user dictate a configuration is a great way to end up with issues. Hope you protected yourself in writing.

Good luck.

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duivert avatar image
duivert answered ·

thats not going to work ... as @nickdb stated, 15kW is not enough, you need at least to triple that amount

i have a 3 phase multiplus 2 3000 system and 15kW pylontech battery storage and thats the recommended minimum


see this document: https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom

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jordant2612 avatar image jordant2612 commented ·
Thanks. I’ll either down size the inverters or increase the battery capacity. So if I’ve got 3 x US5000 commoned up to 3 inverters. Does that document means it’s 1 battery to 1 inverter or 3 batteries to 1 inverter?
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Alexandra avatar image Alexandra ♦ jordant2612 commented ·

@JordanT2612

The basic maths is...

30 000va ÷ 48v = 625A.

The central battery bank needs to be able supply nominally / continuously that amount of current.

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duivert avatar image duivert jordant2612 commented ·
the document is an example with a us2000,

if you look at the multiplus 2 48/ 3000 in the list it says 2x us 2000 for 1 one multiplus (4,8kw total, thats equal to 1 us5000), so for 3x multiplus 2 48/3000 its 6x us2000 / 3x us 5000

if you are going to use the multiplus 10k its going to be 4x us 5000's for one multiplus
(3 phase would be 12x us 5000's)

buts as @Alexandra says, they are all connected in parallel, as one big battery bank

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