[chbot] Scrounging for big switch mode PSUs

[Mark Atherton]

3 x 1kw units in either parallel or series will still produce 1 x 3kw

-Mark

On 8/03/2019 11:45 AM, Wes Edwards wrote:
>
> Hi Peter
>
> Wouldn’t 3 x 1000W @48V units produce either 1kW @ 144V (series) or 
> 3kW @48V (parallel)?  I don’t think you could get 3kW at 114V unless you 
> had 9 units (3 banks in series, with each bank paralleled)?
>
> In any case, I have serious doubts that you can combine PSUs like that 
> either in series or in parallel –you can’t guarantee that the load 
> would distribute evenly – it is more likely that one unit with very 
> slightly different specs would end up taking more load and fail 
> (possibly spectacularly).  I think PSUs are very unlike batteries in 
> this regard.
>
> There may be some exceptions with PSUs that are specifically designed 
> to do this, or specialised control electronics to manage the load 
> sharing, but I don’t know of any.
>
> Wes
>
> *From:*Chchrobotics <chchrobotics-bounces at lists.ourshack.com> *On 
> Behalf Of *Peter Harris
> *Sent:* Friday, 8 March 2019 10:22 a.m.
> *To:* chchrobotics at lists.ourshack.com
> *Subject:* [chbot] Scrounging for big switch mode PSUs
>
> Hi All
>
> As part of my domestic grid tied battery system I need an isolated DC 
> power supply capable of producing 2.5kW at between 120V & 300V  The 
> voltage does not need to be adjustable.
>
> My plan is to purchase 3 x 1000W 48V caged units and series them to 
> yield 3kW @ 144V however I thought I'd see what folks have gathering 
> dust before I place the order. There a many configurations that would 
> do the trick 2 or 3 x 76V or 96V or even a stack of meaty 24V units.
>
> If you have a suitable combination you would like to dump, sell or 
> swap for beer please let me know.
>
>   Peter
>
>
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