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Battery fuse just blew.


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So there I was busy working from home, and the power just went out.

Go check the two DBs and nothing is tripped on either, but there is a distinct burnt smell.

Inverter showing error 56 (battery circuit open), so I pop open the fuse box, and the negative is tripped. I open up the fuse holder and see the 100A is blown.

No high loads were happening at the time. Batteries were charging, normally by what I see in ICC, so I'm stumped as to what happened.

For the time being I've turned off the batteries and inverter, and running purely on grid, but before I go off and get a new fuse and fuse holder, I'd love it if anyone can give insight into what might have happened.

From what I can see, both batteries appear fine, as does the inverter, but I won't know till they are connected again, although ICC reported them as healthy so I'm hopeful.

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  • 2 months later...
On 2020/08/26 at 2:10 PM, ___ said:

I've blown at least three 16A fuses on my PV side, even though the max current according to the spec sheets isn't much more than 10A...

I assume that fuses simply age and fail after some years.

Yes, fuses are valid only for a short period of time like sometime they worked for 2-3 years and sometimes just for 9-10 month or even a shorter period of time.

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On 2020/11/19 at 2:42 PM, John Shaw said:

Yes, fuses are valid only for a short period of time like sometime they worked for 2-3 years and sometimes just for 9-10 month or even a shorter period of time.

is this a fact? I have never seen expiry date on fuses and in cars, most fuses last a life time of the car and they are not on any service schedules. These are supposed to blow when the rated current is exceeded, plus or minus the tolerance. I will agree if you say they some times malfunction and blow even when the rated current is not reached and the same can be said to some not blowing even when the rated current has been exceeded. This occurs in rare occasions and its a malfunction 

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Fuses these days are your last safety device to protect against shorts etc. In the bad old days domestic houses only had fuses to protect circuits. (You made your own fuse by inserting a piece of the correct rating fuse wire into a ceramic fuse holder and then plugging it into the fuse box)

These days fuses are used to disconnect loads that are so great they could cause a fire so they tend to be high current and shouldn't ever blow. Low voltage battery cables are difficult to protect since the currents they feed are so high but if you can use a CB in conjunction with a fuse that's a better bet . (A good reason not to choose 12V dc as your inverter battery voltage)

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