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<div class="moz-cite-prefix">3 x 1kw units in either parallel or
series will still produce 1 x 3kw</div>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">-Mark<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 8/03/2019 11:45 AM, Wes Edwards
wrote:<br>
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<div class="WordSection1">
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi
Peter<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Wouldn’t
3 x 1000W @48V units produce either 1kW @ 144V (series) or
3kW @48V (parallel)? I don’t think you could get 3kW@114V
unless you had 9 units (3 banks in series, with each bank
paralleled)?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Wes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> Chchrobotics
<a class="moz-txt-link-rfc2396E" href="mailto:chchrobotics-bounces@lists.ourshack.com"><chchrobotics-bounces@lists.ourshack.com></a> <b>On
Behalf Of </b>Peter Harris<br>
<b>Sent:</b> Friday, 8 March 2019 10:22 a.m.<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:chchrobotics@lists.ourshack.com">chchrobotics@lists.ourshack.com</a><br>
<b>Subject:</b> [chbot] Scrounging for big switch mode PSUs<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">Hi All<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">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.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">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.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">If you have a suitable combination you
would like to dump, sell or swap for beer please let me
know.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"> Peter<o:p></o:p></p>
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