April 12, 20242 yr There was a short in one of our ac outlets connected to our inverter which was tripping it. It seems to have melted the fuse holder. Interestingly it did not break the fuse. Anyone know what is going on here? I've sorted out the short. Waiting to find out more before I connect the battery. Don't want to blow the Bms.
April 12, 20242 yr Yeah - no way that wire or holder is rated for 100A - it will start a fire long before the fuse pops.
April 12, 20242 yr Using fuse holder like that is very dangerous, like Justin mentioned the wire and terminals inside the fuse holder is not rated to handle a 100A load and will cause the wires and fuse holder to melt and even start a fire, imagine having to pull the fuse from that holder while its smoking hot when there is a problem. In your case it would seem that even perhaps the fuse is rated to high for the inverter that you use and the terminals in such a fuse holder will also heat up especially under high loads and with time melt. I would recommend replacing the fuse holder with some type of fuse holder/disconnect such as the NH series fuse holder and fuses and the correct rated fuse Edited April 12, 20242 yr by Danny Coghill
April 12, 20242 yr Author Thanks for the info. Makes sense. I see the 100a dc breakers are close to R1k. Is this correct? Are these the only option? The system is a 12v lifepo4 Daly bms and 1200 axpert.
April 12, 20242 yr DC breakers tend to be expensive, perhaps a more cost effective option is the LOCK-TYPE CYLINDRICAL FUSE HOLDER FOR 22x58mm FUSES and a FUSE CERAMIC RND 22x58 100A, similar to the ones that are used for Solar Panels. 100A is the correct rating for your setup, just make sure that your battery wire thickness is at least 16mm2 but I would recommend 25mm2.
April 12, 20242 yr 30 minutes ago, Danny Coghill said: DC breakers tend to be expensive, perhaps a more cost effective option is the LOCK-TYPE CYLINDRICAL FUSE HOLDER FOR 22x58mm FUSES and a FUSE CERAMIC RND 22x58 100A, similar to the ones that are used for Solar Panels. 100A is the correct rating for your setup, just make sure that your battery wire thickness is at least 16mm2 but I would recommend 25mm2. Yes you can use this or the maxi blade fuse holder. Some do call it a blade although blade is mostly used for the fuse holder that melted. You also get mega fuse holders for use up to 80V but mostly used up to 32V. Edited April 12, 20242 yr by Scorp007
April 12, 20242 yr I will not use the lock type cylindrical fuse holders for battery protection. If the NH type fuse holders are expensive much rather use the NT type fuse with ceramic fuse holder at R150 for fuse+holder. Minimum 25mm² battery cable as you are running high currents on a 12v system.
April 13, 20242 yr 12 hours ago, sunset1 said: Thanks for the info. Makes sense. I see the 100a dc breakers are close to R1k. Is this correct? Are these the only option? The system is a 12v lifepo4 Daly bms and 1200 axpert. You can get the Onesto brand for half that price. https://gmelectronics.co.za/pages/Our-Store.asp?PID=446264&P=160 AMP Double Pole Fuse Holder
April 13, 20242 yr Author So it seems something has happened to the inverter from the short I'm presuming. Battery to loads works fine as does utility to loads however when pv or utility to battery kicks in fault code 8 comes up. This error code is bus high voltage. Then a smell of something burning. So it seems there is a problem with battery charging mechanism.. Huff
April 29, 20242 yr Author Hi quick question. If I have a 12v battery and 1000W, is not a 100amp the right current rating?
April 29, 20242 yr 2 hours ago, sunset1 said: Hi quick question. If I have a 12v battery and 1000W, is not a 100amp the right current rating? Yes it is a bit small and 125A is more like the better choice to allow some starting of motor loads like a fridge
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