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Old 15-06-2024, 03:59   #1
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Fuse safety question

Are there any safety issue having both a class T style fuse at the LiFePo4 bank plus the Victron mega fuse style found in the Victron Lynx Distributor unit?
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Old 15-06-2024, 04:21   #2
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Re: Fuse safety question

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Are there any safety issue having both a class T style fuse at the LiFePo4 bank plus the Victron mega fuse style found in the Victron Lynx Distributor unit?
No. In fact other than cost it is ideal to have a fuse per battery and then also a master mainbus DC fuse.

The mega fuse has lower AIC but the battery cables, and lugs and connections add resistance. A dead short across tha main busses will be lower max amperage than across the battery terminals (which should be class T for LFP batteries).
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Old 15-06-2024, 04:24   #3
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Re: Fuse safety question

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No. In fact other than cost it is ideal to have a fuse per battery and then also a master mainbus DC fuse.

The mega fuse has lower AIC but the battery cables, and lugs and connections add resistance. A dead short across tha main busses will be lower max amperage than across the battery terminals (which should be class T for LFP batteries).
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Old 17-06-2024, 04:13   #4
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Re: Fuse safety question

Thanks for the answer. So the lower AIC and fuse style in the Lxnx Distributor unit won’t risk welding or arcing before the T style blows?
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Old 17-06-2024, 04:53   #5
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Re: Fuse safety question

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Thanks for the answer. So the lower AIC and fuse style in the Lxnx Distributor unit won’t risk welding or arcing before the T style blows?
No because the resistance between the battery cells and the fuse point in Lynx distributor is much higher than between the cells themselves.

LFP cells have very low resistance so a short across the two battery terminals can produce many thousands of amps of current potentially 10,000A or more. However a short between the main bus bars involves all the wiring, lugs, terminal studs, and metal to metal contact between the battery terminals and the point of the main busbar fuse so the maximum amperage possible is much lower.

Now if you ONLY had the fuse on the Lynx Distributor that would be dangerous as nothing "upstream" of that fuse would be protected but with a class T on each battery and the main busbar fuse you are solid. It is IMHO the best possible setup.
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