Please refer to NEC code Article 240 Overcurrent Protection when sizing the fuses for your application. Extremely current limiting — Stops damaging short circuit current faster than any mechanical protective device.

In this photo we can see the battery bank and the red 2/0 wire feeding the Class-T fuse holder. At a bare minimum you want to be using Class-T fuses as your main bank protection for an LFP bank.All general purpose circuits, Motors, Transformers, Solenoids, Fluorescent lighting, All system components with high in-rush currents NOTE: Class T fuses do not have an ignition protection rating. As near as I can tell, from speaking with Blue Sea Systems, as well as Cooper Bussmann, they have not been specifically tested for this. This only means that they’ve not been tested, not that they would necessarily be unsafe. Current limiting design greatly reduces damage to equipment caused by heating and magnetic effects of short circuit currents. Fused combination motor controllers to provide IEC Type 2 (“No Damage”) motor branch circuit short-circuit and ground fault protection, Motor control centers, Transformer protection, Protection for UL Listed series rated molded case circuit breaker panels, General purpose circuits — mains, feeders and branch circuits — especially when space is limited

One of the most important aspects of electrical wiring of photovoltaic systems is fusing. Fuses provide integral protection against overcurrents that could otherwise damage your valuable PV equipment. Furthermore, using an incorrect fuse can be extremely hazardous! Remember an ANL IP rated fuse has an AIC of 6000A and a Class-T non IP fuse has a 20,000A interrupt rating.. If you have a gasoline powered vessel, which requires ignition protected devices, consider this when engineering the over current protection for your LFP system.. The only unsafe failures we had were off-brand el-cheapo car stereo type ANL fuses. As can be seen here the windows literally exploded out of the fuse when it tripped. I did not have a single unsafe failure of a Cooper Bussmann/Blue Sea Ignition Protected ANL fuse but I only blew about 10 of them. I suppose if you blew 100 you may have an unsafe failure on an LFP bank..

The lithium jump starter is going to be made as small as possible, sufficient to deliver cold cranking amps. Maybe 600A into 8V for a 12V starter? So that might be 1800A into a short. I doubt it is 10's of thousands, but I haven't worked with lithium. If it could do 10's of thousands, I think a smaller cheaper battery would have been used, still able to turn the car engine over.

Steel reinforcing springs supplied as standard provide low resistance connection and long-range reliability DC circuits, All general purpose circuits, Motors, Transformers, Solenoids, Fluorescent lighting, All system components with high in-rush currents Interrupting rating: Interrupting rating is the current that a fuse, circuit breaker, or other electrical apparatus is able to interrupt without being destroyed or causing an electric arc with unacceptable duration. Can you point to this standard? I have been trying to look into this recently, but the latest publicly available version of the ABYC E-11 is 2008 when LFP was in its infancy. They do not differentiate OCP based on battery type, only on battery bank size.

Circuits having relatively low levels of available short circuit current, Industrial and commercial applications having frequent outages where a renewable type fuse is desired Still, I would strongly urge Class-T as the bare minimum for LFP bank main over-current protection. When sizing the fuse, the most common calculation method is to multiply the continuous load/feed current of a branch by 1.25, and use the closest rated fuse that is greater than your result. However, there are exceptions to this calculation method. At the same time I know from experience that inverters don’t care if you use an external fuse or not and that Gopower is a reputable mfg and their equipment has internal fusing and will protect itself. And I know that the real use of the ‘catastrophic’ fuse is to protect the wiring. My wiring will be simple and short. 2 gauge battery cable. The battery and the inverter will be close together inside the living space. Skoolie. I’m much inclined to use a 300A MRBF fuse. That might clip my surge limit but I don’t expect to use that much power anyway. Alternatively Blue Sea makes a 400A ANL. That wouldn’t clip my surge and would still protect my wiring. This bank can easily throw 20,000A or more of current into a dead short and can damage and literally blow windows out of ANL fuses. I had this happen during the testing of some ANL fuses sent to me by a DIY LFP guy from Cruisers Forum, Thanks Bob E.. Class-T fuses are fully metal encased and are a very safe fuse.