Hey @JustMe, welcome!
As @will.topping said, probably not worth spending much as we’ve no idea how our nodes will get used when Storj goes live.
Even when it does, usage will vary depending on location, connection, and client usage…
It’d be best to reuse any spare disk you’d already have, if any.
Besides, SSDs do consume less power than 3.5" drives, but 2.5" mechanical hard-drives are quite power efficient and still less expensive than SSDs.
Personnally I’m using 2.5" drives: their power comsuption is between 1 and 2.5w each, depending on wheither they’re idle or working.
SD cards do wear quicker than SSDs, and the one actually running the OS will eventually fail even if you’re not putting Storj files on it, just because of OS log writes, fake clock updates, docker stuff etc… Unless you configure your RPi in a very specific way to prevent writes on the SD card.
This said, a good SD card should last several years I reckon, as long as it’s not over-stressed.
About the estimator: right now, it is clearly over-estimating what can be earned. At least in my case.
Don’t expect to get rich by becoming a Node operator.
But again… We’re not sure what will be the real usage of the network in 3 months time, 6 months, 1 year…
So, watch this space