B2B connector hot

[Tombola]

Ive had a victron 12 12 30 installed for a bit now, 16mm cable from cab bat via a 40 a fuse at the battery(may be 50) going to another fuse to the bus athen onto the leisure batteries.

Whilst driving round the Isle of Man today approx only half hour could smell a plasticcy type burn, looked under the passenger feet panel, and the cables were fine, not hot etc but the metal connector that links to the fuse then into the cab batt was hot, and touching the palstic cowel on the battery and slightly melting it? The metal connector was added to lengthen the cable slightly on adjusting the fitting for more "wiggle room" after install.

First glance (without tools) seemed tight connections and no cables seemed hot all the way to the leisure batts? this is the first time its happened and Ive ran for hours with it on before now?

Any insight appreciated?

 

[donkey]

My guess would be a poor connection, for whatever reason. Corrosion, not tight, poor solder, poor crimp etc.

Geoff

 

[John H.]

My guess would be a poor connection

I will go with that.

I have a 1500W Inverter which I had been running off an AGU fuse, which was getting hot despite the connections being checked.

I replaced the AGU fuse holder with a more sustantial fuse holder with bolted on ring terminal connections and a bolted in fuse and it now runs cold.

 

[TinaLes]

I take it you are using a midi fuse with holders such as this?
Amazon product ASIN B00904N8REand a fuse to match like this
Amazon product ASIN B08BPDHS48
If so they should be OK, as the Victron B2B is only rated at 30amps, but I have heard that the rear heatsink gets Very Hot, so be careful where you mount it it will burn any wood behind I am told.
Check all connections/cables for tightness, but it does sound like thats the problem, a hydraulic crimper can be handy also when using large crimps.
Good Luck.
LES

 

[autorouter]

The metal connector was added to lengthen the cable slightly on adjusting the fitting for more "wiggle room" after install.

What metal is it? Stainless steel, perhaps? That has quite a high resistance compared to copper or brass.

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[Tombola]

yes autorouter it's stainless . Change it maybe ?

 

[autorouter]

it's stainless . Change it maybe ?

Looks like a good idea. You could check by measuring the voltage drop across it, when there is a good current flowing through it. Should only be a few millivolts. If you want a replacement, flattened copper tube is often used as a busbar to carry heavy currents. or you can buy copper busbar from electrical suppliers like CEF.