I haven’t verified it, but it local ML models on audio is pretty efficient and should run fine on a raspberry pi.

I don’t understand the parallel part. Do you mean independent, so the critical stuff can only get power from the solar circuit? Since it’s critical stuff, do you have a fallback if solar production is low? Is your battery 24 or 48v?

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To add to your decision paralysis, a USB 6 bay DAS is cheap and power efficient solution.

https://blog.patshead.com/2025/06/is-a-4-bay-usb-sata-disk-enclosure-a-good-option-for-your-nas-storage.html

Personally, I have a SSD with a 4-3-1 backup for important files and a 16 TB hdd with a 2-2-0 backup for unimportant files.

Regardless of what you go with, I’d recommend buying less quantity of higher capacity drives (14+ TB) instead of more smaller capacity drives. I’d also make sure you have a backup strategy in place first, and then worry about RAID.

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