Do you have a fallback if solar production is low?

What are you using the batteries for?

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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.

[US] ThirdReality SmartPlug Gen2. It’s ZigBee 3.0, power monitoring, power button, UL/ETL certified, and 3reality is part of the works with HomeAssistant program so firmware updates are easy. It’s also $10. They work as great repeaters and have improved my ZigBee network.