What size fuse between battery and Phoenix 12/250 inverter?

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danjorourke asked Jul 25, '22

What size fuse between battery and Phoenix 12/250 inverter?

Hi,

What size fuse do I need between my 100ah battery and a Phoenix 12/250 inverter? Inverter has continuous power of 200w and max of 400w. I am using a Smartsolar MPPT 100/20.

Thanks!

Phoenix Inverter fuses

2 |3000

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Answer 1 · 2022-07-25T10:06:28Z

Alexandra answered · Jul 25, 2022 at 10:06 AM

@danjorourke

It depends on your wiring, you generally fuse for that.

But 250/12 is 20.8A. So a 25A fuse minimum.

The internal ones are 30A see page 4 of the printed manual.

screenshot-20220725-120329.jpg (115.1 KiB)

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danjorourke commented · Jul 25, 2022 at 10:17 AM

Hi Alexandra,

Thanks for your reply. I also thought it should be 25a but my manual says the internal fuse is 60a, not 2 x 30a as your manual states.
As I can't get a 25a fuse, do you think a 30a will be ok?
My wiring will be 6mm² at a length of 1.5m.

Thanks

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img-20220725-121154000.jpg (916.6 KiB)

Alexandra ♦ danjorourke commented · Jul 25, 2022 at 10:25 AM

@danjorourke

For 6mm² a 30A fuse is perfect.

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Alexandra ♦ danjorourke commented · Jul 25, 2022 at 10:31 AM

Went and checked my printed manual its from 2017. Its the same as yours, so there must have been a revision to the online one, its date is 2020

Still you are fusing for your wiring.

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k-k Alexandra ♦ commented · Aug 20, 2023 at 12:12 PM

Maybe the "last resort" 60A internal fuse was mentioned in the older document erroneously.

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