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Hi Mark,<br>
<br>
One thing to be aware of is capacitance inrush current, quite common
with DC-DC converters.<br>
If you are running the converters off of the Prostar controller load
circuit, the inrush current might<br>
be sufficient to trigger a high current shutdown of the load
circuit.<br>
<br>
A single low current converter will probably be fine, especially if
using the 30 amp Prostar.<br>
<br>
If you do decide to use the Tristar and go with a 48 volt
configuration, 2 converters will not<br>
be an issue because the Tristar has no load circuit, your loads will
be powered off of the battery.<br>
<br>
I'll put my installer hat back on here and say that I always prefer
the least complex solution.<br>
The 24 volt configuration with the single converter would be that
solution and also provide LVD.<br>
<br>
<pre class="moz-signature" cols="72">Roy Butler
Morningstar Technical Support
</pre>
<div class="moz-cite-prefix">On 12/19/2024 9:51 AM, Mark Frye via
RE-wrenches wrote:<br>
</div>
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<p class="MsoNormal">My equipment has both 12 V and 24 V each at
about 60W.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I was planning to run a Prostar at 24V and
then use a DC DC converter for the 12 V load.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">That looked like 2 x 285 AH AGM and 2x 320
W PV.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Now I have to go to a darker place and may
have to double the battery and the PV.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">That would mean I could run a Tristar at
48V and have a two DC DC converters, one for the 24V loads and
one for the 12V loads.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Somehow it makes sense to me to run the
supply side at 48V for lower currents and more battery cells
even if it means an additional converter on the load side.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any thoughts one way or the other?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Mark Frye <o:p></o:p></p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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