Author Topic: Multipul DC power supplies in parallel on different breakers  (Read 621 times)

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Offline PlasmateurTopic starter

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Multipul DC power supplies in parallel on different breakers
« on: August 19, 2019, 02:22:35 pm »
Hello,

I'm just looking for best practices when attempting to wire DC power supplies in parallel. I'm in need of 48V, 50A and I am in possession of QTY:3 48V 20A power supplies.

I was going to connect each power supply to mains, and each power supply would be connected through a different 20A breaker. Could I use a mechanical switch to turn them all on at once?

Also, should I be using diodes on each DC leg of the power supply to prevent any damage when switching them on?

Together they are powering an inductive load.
 

Offline capt bullshot

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Re: Multipul DC power supplies in parallel on different breakers
« Reply #1 on: August 19, 2019, 02:39:19 pm »
In general, the answer is Yes (to both questions).

You'd better look for the manual of your 48V supplies to see if there's a preferred way to run them in parallel (some power supplies offer this). Otherwise, the usage of diodes to decouple them is the way to go.
By using diodes, the supplies are decoupled and protected, but current sharing might be unequal.
Safety devices hinder evolution
 
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Offline PlasmateurTopic starter

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Re: Multipul DC power supplies in parallel on different breakers
« Reply #2 on: August 19, 2019, 06:34:11 pm »
In general, the answer is Yes (to both questions).

You'd better look for the manual of your 48V supplies to see if there's a preferred way to run them in parallel (some power supplies offer this). Otherwise, the usage of diodes to decouple them is the way to go.
By using diodes, the supplies are decoupled and protected, but current sharing might be unequal.

Thank you for the reply! My intuition seemed almost correct - as you say, I should check the manual - they were cheap dudes I bought off amazon, maybe the seller has the manual on hand.
 


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