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jefffay asked

Lynx Shunt Fuse Incredibly Hot

Can anyone shed light on why my 500 AMP fuse in my Lynx Shunt is cooking? Right now it's at 280 degrees F (138 degrees C). I'm charging 4 x 12v 200AH LiFePO4 batteries at max (limited by me) current of 160 AMP (2 x Multiplus 2's 12/120/3000 set up in split phase. I can't imagine charging at the max of 240 AMP.... The bus bar is also really hot at 100 degrees F (38 degrees C). I have 4/0 AWG cables between the bus and the inverter / chargers. Ambient temp ~ 82 degrees F (28 degrees C).

Thanks in advance.

lynx shunt
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Chris Barber answered ·

the first thing that comes to mind is a poor or loose connection on one end of the shunt. Even a tiny amount of resistance will cause significant heating at the connection when there's a good bit of current flowing. I squared R is the expression for power dissipation. I'm just finishing the installation of a lynx shunt but I haven't put any power through it. I'll certainly be monitoring temperatures in my initial system tests.

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jefffay avatar image jefffay commented ·
Thanks Chris, everything is tight. My 4 x batteries are connected to the Lynx power in in parallel each with a pair of 25mm2 cables. I'm wondering if that's where the resistance is.... My 2/0 AWG cables arrive today I'll test again tomorrow with those cables an see what's up.
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Lynx Shunt VE Can online manual


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