Power One FXP7000 power supply paralleling up to 210 KW

[shreeje]

Power One FXP7000 power supply paralleling up to 210 KW - Each power supply is 7000 Watts with 48 V DC output. Any issue with output or input connectors on power supply or when it's paralleled with other ten FXP 7000 power supplies because it does not have output isolation diode.

S Patel

 

[IRstuff]

No issue, so long as you are prepared for an explosion, should any single supply fail and all the other supplies attempt to dump their power into the failed supply. I mean, we're only talking about 4.4 kA, so no big deal, right?

Oh, and trying to get 4.4 kA through any cable and junction block should prove interesting as well, Be prepared for sparks and molten wiring.

Oh, and getting down to a couple hundred microohms should likewise prove interesting.

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[shreeje]

IRstuff,

Thanks, for the response. Oh, and getting down to a couple hundred microohms should likewise prove interesting. Can you explain your above comment regarding "Getting down to a couple of microohms should be interesting".

 

[ScottyUK]

Every milliohm of main bus resistance drops 4.4V. That's 9% of your available supply. Hundreds of micro-ohms will still be a fair amount of volt-drop.

Why don't you ask PowerOne about your proposal? They built the PSU, who would know better than them what it is capable of?


You would get better value for money - and perhaps better reliability - from a manufacturer of large battery charger rectifiers. 48V is a fairly common voltage for telecoms, and you should be able to get a single rectfier in the 600A - 800A output region without too much difficulty. They are normally capable of parallel operation.

 

[IRstuff]

I used a 1V droop/leg as the limit for the series resistance. That's almost 5% of the nominal voltage. If your load can tolerate more droop, then the resistance does not have to be that small. BUT, BUT, BUT, my values will already result in 8.5 kW of parasitic (lost) power dissipation.

I think you need to start with a clean sheet and re-derive all your requirements.

TTFN
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