chadmichael
New Member
- Joined
- Feb 26, 2022
- Messages
- 51
I have a Big Battery 170 Ah 12v OWL, spec sheet here.
Here are salient points from my battery specs and system build...
1) Specs say this has a built in 300 A safety fuse. As I've seen on some tear down videos, this fuse is behind the negative terminal. I understand this to be a sort of last resort safety protection against a very high draw (short circuit? other?)
2) Specs for the BMS say Max Charge and Continuous Discharge are both 175 Amps.
3) Specs say Max Peak Discharge 350A (over 6 seconds)
4) Following Will P's 400 Watt mobile build recipe, we have a 200A fuse bolted on to the battery's positive terminal (sized according to my inverter )
QUESTIONS
1) Why do I need the 200 A bolt on fuse since the battery's own built in fuse is there? What scenario does this fuse protect against?
2) How does the battery every discharge at 350 A for 6 seconds when both the bolt on fuse and the internal fuse (300A) would seem to positioned to cut off the current at a much lower level?
3) What scenario is the internal 300 A fuse built to protect against? And why is it on the negative when we put the external fuse on the positive terminal?
Here are salient points from my battery specs and system build...
1) Specs say this has a built in 300 A safety fuse. As I've seen on some tear down videos, this fuse is behind the negative terminal. I understand this to be a sort of last resort safety protection against a very high draw (short circuit? other?)
2) Specs for the BMS say Max Charge and Continuous Discharge are both 175 Amps.
3) Specs say Max Peak Discharge 350A (over 6 seconds)
4) Following Will P's 400 Watt mobile build recipe, we have a 200A fuse bolted on to the battery's positive terminal (sized according to my inverter )
QUESTIONS
1) Why do I need the 200 A bolt on fuse since the battery's own built in fuse is there? What scenario does this fuse protect against?
2) How does the battery every discharge at 350 A for 6 seconds when both the bolt on fuse and the internal fuse (300A) would seem to positioned to cut off the current at a much lower level?
3) What scenario is the internal 300 A fuse built to protect against? And why is it on the negative when we put the external fuse on the positive terminal?