Help deciding on the best power suply for a NAS with 16 3.5" disks

TrueNAS General
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Hello everyone! I’ve been a TrueNAS user for a few years and I’m currently planning a deskserver for TrueNAS backup of a client’s main TrueNAS.

In my main TrueNAS, I made a good investment, we bought a Datacom jbod chassis with capacity for up to 24 20TB disks for data archiving, but we are only using 16 at the moment.

In this case, I’m planning a deskserver with the little budget left over to make a backup storage for this main server (the budget won’t be enough to buy another jbod chassis), so I’ll have to resort to using disks connected directly to an adapted disk tower.

I already have a good part of the project planned, however, one thing has been worrying me: I would need to connect up to 16 disks and I’m afraid that this many disks will end up overloading the 12v power supply cable.

Has anyone done something like this before? My goal is to set up 2 ZFS volumes in RAIDZ1 with the I have 8TB disks from my old server to back up the 90TB of data I have, and in the coming years, maybe I’ll acquire another JBOD chassis to expand this backup server.

I had thought about using a modular power supply or something like that, but even then, if I use 2 different cables, it would be 8 3.5" disks on each cable (excluding the boot disk, which is an SSD).
If anyone has done something like this and can share their opinion, I would appreciate it.

PS: I live in Brazil, and here even an old JBOD chassis is expensive; even models limited to HDDs of less than 4TB cost more than $500, imagine more expensive models.

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This may help a little if you didn’t see it already.

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This article helped a lot, in this case I didn’t imagine that I should put 35w per disk, by my calculations then, I would need a power supply above 700w to support all of this.

However, one of the points that I have the most difficulty with is something that was mentioned in it, but that didn’t help me much, it would be about the maximum amperage for the 12v line of the source.

However, based on this, I will continue my studies here and see the best option or look for a used jbod chassis at a good price, even though it is more expensive, it may end up being better to avoid the risks mentioned in the article, such as the premature death of the disks.