Looking to hire someone capable to build a power cable for my project.

Hi Matt,

I agree with John, while it is possible to parallel batteries there are many practical difficulties and usage limitations/difficulties to keep them operating in a safe or reliable state. If you're confident on this area (i.e. you have engineered this as John says and know what you're doing) then there are companies that offer custom cable assembly (even for 1-off cables). They will be really expensive, but this is to be expected because it is a labour-intensive task, it could take several days to do it properly, and they will need to design a jig for consistency, and use additional materials for attaching the tails. Any engineer will charge quite a lot for this task. Another thing that could be a concern is the type of connector. Is this a hobby RC connector? This is maybe fine for hobby RC use with a single battery, but I'm guessing your project isn't for such use. That connector doesn't seem to have any strain relief, and the battery and heavy cable are supported just by the strength of the solder it seems, whereas most other connectors at least crimp around the insulation too. Again if you've already engineered for this then that's fine, it is just a thing to be aware of if you've not already considered it.

I've had a friend w/ experience in the area go over all of the calculations with me as far current, efficiency loss, etc goes. We came to the agreement that a simple 8awg wire should be plenty thick enough to handle the power levels I'm wanting to push with additional head room for safety.

The battery packs will be secured in a fireproof case and will not be moved at any point. The power cable I'm requesting will simply plug into the connectors and lay on top. There will be no strain of any kind on the cable.

I have reached out to numerous cable manufacturers who claim to offer one-off, custom builds, and no body seems interested in either responding to me or this is not something they do regularly. One shop told me they would pitch it around to a few shops in china to see if any were interested. That, to me, seems like way more hassle. I'd rather just give my money to someone here local and have a personal relationship with someone rather then throw caution to the wind with random chinese manufacturing.

I'm not wealthy, by any means, but right now I can't even get a rough estimate for what someone would charge for this. Being a one-off item is not interesting  to most of these manufacturers. I was hoping there would be a few folks here who might be excited in my project and offer their services.

p.s. To John's question above. Each battery pack in parallel has its own BMS attached. Rather than balancing 50 different packs, each pack will balance itself.

This is the battery pack in question:

I've had a friend w/ experience in the area go over all of the calculations with me as far current, efficiency loss, etc goes. We came to the agreement that a simple 8awg wire should be plenty thick enough to handle the power levels I'm wanting to push with additional head room for safety.

The battery packs will be secured in a fireproof case and will not be moved at any point. The power cable I'm requesting will simply plug into the connectors and lay on top. There will be no strain of any kind on the cable.

I have reached out to numerous cable manufacturers who claim to offer one-off, custom builds, and no body seems interested in either responding to me or this is not something they do regularly. One shop told me they would pitch it around to a few shops in china to see if any were interested. That, to me, seems like way more hassle. I'd rather just give my money to someone here local and have a personal relationship with someone rather then throw caution to the wind with random chinese manufacturing.

I'm not wealthy, by any means, but right now I can't even get a rough estimate for what someone would charge for this. Being a one-off item is not interesting  to most of these manufacturers. I was hoping there would be a few folks here who might be excited in my project and offer their services.

p.s. To John's question above. Each battery pack in parallel has its own BMS attached. Rather than balancing 50 different packs, each pack will balance itself.

This is the battery pack in question: