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Forum Index : Electronics : overheated inductor winding

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poida

Guru

Joined: 02/02/2017
Location: Australia
Posts: 1418
Posted: 01:46am 19 Sep 2020
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Since it was about 1 year of continuous service from the 6kW Madness powerboard & nanoverter controlled inverter it was time to have a look to see how it's going.

All OK from about 2.8 MW.hr of output over that period.
Except the choke windings.

I used the cable from here
Two chokes, 5 turns around one, 6 around the other.
The 2 chokes were wired in series.

Here is the winding from the 6T choke.






It seems I need to use higher current cable and maybe something that can handle
a bit of heat.

The 5T choke was effected to a small degree, nothing like the above.

I rewound the choke to now have both cores stuck together with doublesided tape
and put enough turns in it for 70uH.
The cable used allowed 3 runs of 3mm diameter (7mm2 area) so it's probably going to be good for another year.
wronger than a phone book full of wrong phone numbers
 
renewableMark

Guru

Joined: 09/12/2017
Location: Australia
Posts: 1678
Posted: 04:01am 19 Sep 2020
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That's only 7.5mm2.
Maybe try 25mm2 like this one
I got it from here which isn't terribly far but more than 5km, I'm sure they deliver/post though.
Cheers Caveman Mark
Off grid eastern Melb
 
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