question

jsheehan avatar image
jsheehan asked

Can I connect my Pylontech Batteries like this?

Hi,

Here is my wiring diagram, I am a bit worried about the size of the Pylontech cables 25mm2 connecting to the inverter, So I was wondering if you can connect your batteries like this and then have a 50mm2 cable from the lynx to the inverter? And if this is ok what size Mega fuses will I need in the lynx distributor?


screen-shot-2021-10-19-at-13503-pm.png

Pylontechwiring
screen-shot-2021-10-19-at-13503-pm.png (1.9 MiB)
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1 Answer
CristiMV avatar image
CristiMV answered ·

The cables and fuses have to be sized based on the maximum current that should pass. If you start from the Multi II, then you have a maximum possible current of 70A (for 48V). The Pylontech cables are rates to 120A, therefore also one pair of cables should be enough for 2 batteries in parallel. Therefore, having them as in the picture is even better.

If use the Lynx distributor, then you need to use Mega fuses...and the smallest one is the 125A


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piet-hein-van-asselen avatar image piet-hein-van-asselen commented ·
I know this is an old thread, but i am curious on how you get 70A max possible current, while allready on full load the Multi can discharge around 100A. And keep in mind it can be twice this amount for a short period...


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Alexandra avatar image Alexandra ♦ piet-hein-van-asselen commented ·

The US3000s are rated for 37A each. So together close to 70A discharge nominal. Probably just referring to their discharge not what the inverter can do.

Batteries are undersized for the system as you pointed out it needs more amps.

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skydog avatar image skydog Alexandra ♦ commented ·

I'm looking at an almost identical installation, with the difference being a GX Multiplus 48/5000/70 and a MPPT 250/100.

On the manual of the inverter, it is suggested for a 70mm2 cable to be used on the inverter battery connection, however, the pylontech standard cables are 25mm2 as mentioned on the thread above.

How does one overcome this?

Thanks in advance.

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Duivert NL avatar image Duivert NL skydog commented ·
The pylontech cables are actually 4 AWG thats 21mm2, they are ok for short connections up to 120A


but if you have multiple pylontechs you can also connected them seperately to the busbar or lynx, all depends on what type and how may pylontechs you have


or you could make your own cables (i did that with 25mm2 cables and amphenol connectors)
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Related Resources

Victron Pylontech battery compatibility guide

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