question

99sport avatar image
99sport asked

Fusing of low-power Victron components (VE.Bus BMS & BMV712)

Does anyone know what fuse to use in the power line for the VE.Bus BMS? The instructions show it in the diagram (attached) but I cannot find any mention of the type of fuse to use. (For comparison, the Color Control GCGX states in the manual to use a 1amp slow-blow fuse).


Also, what fuse should be used in the power line to the shunt shipped with the BMV712?


Thanks

BMV Battery MonitorBMSinstallation
1555695699156.png (130.2 KiB)
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2 Answers
kai avatar image
kai answered ·

I don't think its particularly critical as far as the BMS is concerned.

Since the manual said nothing, go with the standard approach of sizing the fuse according to the wire gauge.

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Justin Cook - Bay Marine Supply USA avatar image
Justin Cook - Bay Marine Supply USA answered ·

I'm late to this question, but @99sport, the BMV shunt PCB power supply fuse is a 100mA quick-blow; the BMS fuse is the 1A slow-blow.

2 comments
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wkirby avatar image wkirby ♦♦ commented ·

If your BMV has a 100mA fuse in it then you should swap it for a 1A fuse.
The 100mA fuse presents too much Voltage drop and will cause the Voltage readings to be inaccurate.
Newer BMV's will ship with a 1A fuse.

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Justin Cook - Bay Marine Supply USA avatar image Justin Cook - Bay Marine Supply USA ♦ wkirby ♦♦ commented ·

Oh man, good to know! Thanks @WKirby; I know a number of our BMVs have had the 100mA fuses in them, but I haven't checked a recent version. Will take under advisement!

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