Preferred solutions for smaller 48V loads?

I was searching for something similar. I found that Optifuse has 58V ATO form factor fuses and inline holders that are UL recognized. Haven't found where to buy them yet, perhaps digikey...Here is one.

Wanted to comment that I also found the Optifuse APR58-UL (standard blade fuse ATO/ATC form factor) at Digikey and used them as the individual fusing for paralleling the packs in my DIY powerwall. I was also trying to find a good solution for low-current distribution/collection for my 48V system. I wish automotive-style fuse blocks were available for mini fuses that frequently are rated to 58V volts!

Current collection system:


Writeup on whole parallel-pack powerwall FYI:

Cheers,
Mike

mschaus said:

Wanted to comment that I also found the Optifuse APR58-UL (standard blade fuse ATO/ATC form factor) at Digikey and used them as the individual fusing for paralleling the packs in my DIY powerwall. I was also trying to find a good solution for low-current distribution/collection for my 48V system. I wish automotive-style fuse blocks were available for mini fuses that frequently are rated to 58V volts!

Current collection system:
View attachment 207213

Writeup on whole parallel-pack powerwall FYI:

How to build a DIY powerwall using parallel ebike batteries

How to build a powerwall-style battery using reclaimed ebike battery packs and use it to power your home!

mschausprojects.blogspot.com

Cheers,
Mike

Click to expand...

Woah, that's a pretty cool idea.
I legit would've used that if it knew it existed.


I just read through your whole blog post, good job.

I don't have any individual fusing at all on my 36v eBike battery bank, but I have them all paralleled and run through a Class-T fuse and a circuit breaker before going to my inverter.

Btw I also am dealing with the same situation you are in, where I am really left in the dark as to whether any individual pack has failed or not, it's hard to tell without occasionally individually checking each.

I have all of the batteries running through a shunt, so I occasionally unplug every pack but one and read the voltage that way, doing it for each of my 10 packs.

Andrewr05 said:

Woah, that's a pretty cool idea.
I legit would've used that if it knew it existed.


I just read through your whole blog post, good job.

I don't have any individual fusing at all on my 36v eBike battery bank, but I have them all paralleled and run through a Class-T fuse and a circuit breaker before going to my inverter.

Btw I also am dealing with the same situation you are in, where I am really left in the dark as to whether any individual pack has failed or not, it's hard to tell without occasionally individually checking each.

I have all of the batteries running through a shunt, so I occasionally unplug every pack but one and read the voltage that way, doing it for each of my 10 packs.

Click to expand...

Thanks!

I was really interested in individual fusing of the packs as a last resort. In the event there is an internal cell short on a pack that does not trip the cell CID, AND the BMS malfunctions and does not catch it, there is a 10A fuse to prevent giant inrush of current into the pack. For external issues, the main breaker for the whole system has a current rating greater than the theoretical short circuit current of the whole shebang, so I figured that will take care of it. An extra Class T would also be good backup!

A lot of arcing/smoldering damage can happen before any one of these protections goes off, though. But really what I want to protect against is catastrophic thermal runaway. On another DIY portable power station I've burned up XT60 connectors via an oopsie-daisy even though there was a BMS, electronic overload protection of the charge controller load output, and two thermal fuses in line with the current path.

And for individual pack monitoring -- right, I use an amp-clamp to check each pack while charging occasionally to make sure current is flowing. Could add a hall-effect current probe to each line but that seems bulky and wasteful.