AdriftAtlas
New Member
I have four Eco-Worthy 12.8V 150Ah (120A JBD BMS) in series for a 51.2V system. The batteries use M8 (5/16") lugs. I am using 1ft 1/0 AWG WindyNation wires between each battery, and would like to use 1/0 AWG wires to the main busbars.
I plan to buy a Victron Battery Disconnect that has M10 (3/8") studs. WindyNation sells 3/8" to 5/16" lug wires, so that's not an issue. From there I plan to have two 250A rated busbars (BlueSea or Victron) with M8 studs.
Beyond the busbars will be a 48/1200W Victron Phoenix Inverter. It takes at most 4 AWG and has its own built-in 60A fuse. I may also feed an additional 20A to a portable power station. I doubt any of the loads will ever exceed 80A.
I am guessing I need something like a 125A main battery fuse to ensure that the 4 AWG inverter wires don't melt. Based on what I read on here, Mega fuses can catch fire and thus I'm set on Class T fuses.
I really like this Blue Sea fuse 110A - 200A holder:
www.bluesea.com
The issue is that it has M6 (1/4") studs. To get M8 studs I'd have to go up to the 225A model, which will not fit a 125A fuse.
I believe it's bad practice to use M8 lugs on M6 studs. So do I get an M8 to M6 wire and then an M6 to M10 wire for the battery disconnect and then an M10 to M8 wire for the positive busbar? Or do I stick an M8 lug onto an M6 stud anyway? Is the nut large enough to secure an M8 lug? That seems so contrived.
Then there's the issue of where to mount the fuse holder. I plan to put the batteries on the garage floor so I plan to use main battery cables that are something like 5ft (1.5m) long so they reach the wall. However, fuses are supposed to be installed not more than 7" to 18" away from the battery depending on regulation. The battery boxes are metal and I don't like the idea of installing a fuse that might blow on a battery. So what's the recommended approach here?
I plan to buy a Victron Battery Disconnect that has M10 (3/8") studs. WindyNation sells 3/8" to 5/16" lug wires, so that's not an issue. From there I plan to have two 250A rated busbars (BlueSea or Victron) with M8 studs.
Beyond the busbars will be a 48/1200W Victron Phoenix Inverter. It takes at most 4 AWG and has its own built-in 60A fuse. I may also feed an additional 20A to a portable power station. I doubt any of the loads will ever exceed 80A.
I am guessing I need something like a 125A main battery fuse to ensure that the 4 AWG inverter wires don't melt. Based on what I read on here, Mega fuses can catch fire and thus I'm set on Class T fuses.
I really like this Blue Sea fuse 110A - 200A holder:
Class T Fuse Block with Insulating Cover - 110 to 200A - Blue Sea Systems
Allows use of Class T fuses for high speed circuit protection of electronic equipment and inverters.
www.bluesea.com
The issue is that it has M6 (1/4") studs. To get M8 studs I'd have to go up to the 225A model, which will not fit a 125A fuse.
I believe it's bad practice to use M8 lugs on M6 studs. So do I get an M8 to M6 wire and then an M6 to M10 wire for the battery disconnect and then an M10 to M8 wire for the positive busbar? Or do I stick an M8 lug onto an M6 stud anyway? Is the nut large enough to secure an M8 lug? That seems so contrived.
Then there's the issue of where to mount the fuse holder. I plan to put the batteries on the garage floor so I plan to use main battery cables that are something like 5ft (1.5m) long so they reach the wall. However, fuses are supposed to be installed not more than 7" to 18" away from the battery depending on regulation. The battery boxes are metal and I don't like the idea of installing a fuse that might blow on a battery. So what's the recommended approach here?
