OffGridHawaii
New member
- Joined
- Jun 14, 2020
- Messages
- 13
Aloha,
I have just started to build my 14s172p powerwall and am at a loss with these solder joints failing to hold fuse wire to the busbars. Here's my situation.
*4 cell x 43 cell parallel groups (3' long) feel long
*Negative side utilizes 24 gauge tinned copper wire
*Positive side utilizes 2amp glass axial fuses (link)
*Busbars are 2 lengths of 8 gauge bare copper wire twisted together
*Connection to cell has been via kweld @ 10J
Is it normal for these cell groups to be so flexible? After I finish one side and flip it over, it is resting directly on the solder joints on the other side, this has caused many joints to fail. I don't see how everyone else's packs seem so durable. I cannot get these solder joints to hold properly. I have sanded the copper busbars and used quality 63/37 solder with rosin core. I melt a sufficient quantity of solder onto the fuse/busbar connection and it is weak after cooling. I am using a 40w soldering iron and let it get very hot before melting a glob onto the connection.
I would appreciate feedback on why you may think my solders are failing.
1. Is it normal for these busbar connections to be so delicate?
2. Are my packs too long?
3. How can I better solder these connections?
I have just started to build my 14s172p powerwall and am at a loss with these solder joints failing to hold fuse wire to the busbars. Here's my situation.
*4 cell x 43 cell parallel groups (3' long) feel long
*Negative side utilizes 24 gauge tinned copper wire
*Positive side utilizes 2amp glass axial fuses (link)
*Busbars are 2 lengths of 8 gauge bare copper wire twisted together
*Connection to cell has been via kweld @ 10J
Is it normal for these cell groups to be so flexible? After I finish one side and flip it over, it is resting directly on the solder joints on the other side, this has caused many joints to fail. I don't see how everyone else's packs seem so durable. I cannot get these solder joints to hold properly. I have sanded the copper busbars and used quality 63/37 solder with rosin core. I melt a sufficient quantity of solder onto the fuse/busbar connection and it is weak after cooling. I am using a 40w soldering iron and let it get very hot before melting a glob onto the connection.
I would appreciate feedback on why you may think my solders are failing.
1. Is it normal for these busbar connections to be so delicate?
2. Are my packs too long?
3. How can I better solder these connections?