tl;dr
I want to find a way to take the 12V power from a 4-pin Molex plug, bypass the PSU's 5V rail, and step down that 12V into 5V.
I don't wanna use the PSU's 5V rail because it only has 250W available, but my 12V rail has 1000W available. I figure I can use the 12V rail somehow myself, but I need a converter that can maintain a stable voltage under load. Let's say load is 250W.
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I have a Storinator XL60 chassis which has this pair of redundant PSUs:
https://www.zippy.com/pwproductshowdetail.aspx?pp_rfnbr=1867&pp_code=MTW2-5AD0B2V
Each PSU has 50A available on the +5V rail (250W) and 100A on the +12V rail (1200W).
The PSUs share the load when both are plugged in, but their redundant nature means I'm supposed to be able to take one out and be fine. Still, I'm theoretically able to get up to 500W of 5V power.
Right now, I have 100 SSDs in there, and I'm missing two adapters to make it 132 SSDs.
My 4TB Crucial MX500 SSDs say 5V 1.7A (8.5W) on the sticker. But they only seem to be using between 2.2W (440mA) and 4W (800mA) based on some rough calculations after plugging in 32 more drives.
I'm not sure how much power they use under load, but with 132 drives, at 4W each, I'll be using over 100A of +5V which is more than the max these PSUs allow.
But... The PSUs have plenty of power available on the +12V rail. And I figure, if I could step down the +12V rail using molex plugs to +5V, I could safely use my existing case and PSUs with all 132 drives.
Is there a solution that lets me bypass the PSU's +5V rail, so I can use the +12V rail to step down with relatively high amperage?
I want to find a way to take the 12V power from a 4-pin Molex plug, bypass the PSU's 5V rail, and step down that 12V into 5V.
I don't wanna use the PSU's 5V rail because it only has 250W available, but my 12V rail has 1000W available. I figure I can use the 12V rail somehow myself, but I need a converter that can maintain a stable voltage under load. Let's say load is 250W.
---
I have a Storinator XL60 chassis which has this pair of redundant PSUs:
https://www.zippy.com/pwproductshowdetail.aspx?pp_rfnbr=1867&pp_code=MTW2-5AD0B2V
Each PSU has 50A available on the +5V rail (250W) and 100A on the +12V rail (1200W).
The PSUs share the load when both are plugged in, but their redundant nature means I'm supposed to be able to take one out and be fine. Still, I'm theoretically able to get up to 500W of 5V power.
Right now, I have 100 SSDs in there, and I'm missing two adapters to make it 132 SSDs.
My 4TB Crucial MX500 SSDs say 5V 1.7A (8.5W) on the sticker. But they only seem to be using between 2.2W (440mA) and 4W (800mA) based on some rough calculations after plugging in 32 more drives.
I'm not sure how much power they use under load, but with 132 drives, at 4W each, I'll be using over 100A of +5V which is more than the max these PSUs allow.
But... The PSUs have plenty of power available on the +12V rail. And I figure, if I could step down the +12V rail using molex plugs to +5V, I could safely use my existing case and PSUs with all 132 drives.
Is there a solution that lets me bypass the PSU's +5V rail, so I can use the +12V rail to step down with relatively high amperage?