[chbot] Scrounging for big switch mode PSUs - clarifications

[Henri Shustak]

Hello,

Okay, I understand so this is not batteries you are powering from the mains. Might I suggest looking for a single large power supply and forget the idea of joining them together. I am guessing you will be able to find one. The problem will be that you will need to have wall sockets capable of this power. Typically, 2400W or lower is were fuses are set. If you have a 15A link and socket then that may be okay.

Also, are we talking about a mains supply of 240V to which these DC units will connect?

If I have missed the boat just let me know. I now read it as switch mode power supplies rather than DC switches. That part makes much more sense.

I know what you mean by metal enclosures. Keep in mind that you may want to have something like this grounded or an enclosure as it will be handing quite a bit of power and also ventilation may be worth considering.

Kind regards,
Henri

> On 8/03/2019, at 3:40 PM, Peter Harris <petes.username at gmail.com> wrote:
> 
> To clarify
> I am looking for mains powered DC supplies. The outputs must be floating to allow series connection.
> 
> Re series connection and power. 
> P = V x I so power rises in proportion to V
> A single supply delivering 20A at 50V yields 1000W
> 2 of these in series will deliver 20A at 100V or 2000W
> The 3 x 1000W 48V supplies in series will deliver 20.83A at 144V == 3kW
> 
> Series connection of PSUs is fine provided their output isolation is sufficient to withstand the combined series voltage. Parallel connection is much more difficult but is not required here.
> 
> "Caged" refers to the metalwork enclosing the electronics. Here are the unit's I'm considering
> https://www.aliexpress.com/item/Transformer-Switch-Mode-Power-Supply-DC-48V-3A-5A-7-5A-10A-15A-20A-150W-240W/32908080499.html?spm=a2g0s.13010208.99999999.265.1e3f3c002rOuom
> 
> Thanks to all who have responded so far.
> I have been to Molten Media unfortunately they had nothing suitable.
> I had not considered a welder, I will do some research.
> 
> I feel a talk at the next meeting coming on :)
>   P
> 
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