NordicNerd
New Member
Hello All,
I have noticed when looking at a few different diagrams at either Victron’s or other installers’ wiring diagrams that battery banks with 400 amp hours and less (12v and 24V) are not fused close to the batteries. Instead there is a downstream fuse located after the main disconnect switch. I assume that is because they are protected by the battery BMS.
Looking at fusing my own system I am considering using MRBF fuses on each 24 volt battery string then one main t-class fuse (or mega fuse in a Lynx Shunt or distributor).
Curious on people’s thoughts on this - I know there are a few approaches.
Also, i’m not sure if I understand why Victron for their Multiplus II 24/3000 recommends a 300 amp fuse. I would think it should be 175 amp or 200 amp or for a 2/0 wire I am using - or for the inverter 175 amp for the 2400 W continuous rating.
It would appear Victron may be implying that the fuse size is for the peak wattage of 5500 watts at 24 volts for a a 300 amp fuse.
My take is:
- 175 amp MRBF at each battery string to ensure battery cables protected (2/0 for each string).
- main fuse of 175 Amp to 24/3000 multiplus as max current in 2/0 cable is 175 amp
Anyone else have any thoughts on this - definitely appreciated.
Thanks!
I have noticed when looking at a few different diagrams at either Victron’s or other installers’ wiring diagrams that battery banks with 400 amp hours and less (12v and 24V) are not fused close to the batteries. Instead there is a downstream fuse located after the main disconnect switch. I assume that is because they are protected by the battery BMS.
Looking at fusing my own system I am considering using MRBF fuses on each 24 volt battery string then one main t-class fuse (or mega fuse in a Lynx Shunt or distributor).
Curious on people’s thoughts on this - I know there are a few approaches.
Also, i’m not sure if I understand why Victron for their Multiplus II 24/3000 recommends a 300 amp fuse. I would think it should be 175 amp or 200 amp or for a 2/0 wire I am using - or for the inverter 175 amp for the 2400 W continuous rating.
It would appear Victron may be implying that the fuse size is for the peak wattage of 5500 watts at 24 volts for a a 300 amp fuse.
My take is:
- 175 amp MRBF at each battery string to ensure battery cables protected (2/0 for each string).
- main fuse of 175 Amp to 24/3000 multiplus as max current in 2/0 cable is 175 amp
Anyone else have any thoughts on this - definitely appreciated.
Thanks!