Hi Mark,
One thing to be aware of is capacitance inrush current, quite common
with DC-DC converters.
If you are running the converters off of the Prostar controller load
circuit, the inrush current might
be sufficient to trigger a high current shutdown of the load circuit.
A single low current converter will probably be fine, especially if
using the 30 amp Prostar.
If you do decide to use the Tristar and go with a 48 volt configuration,
2 converters will not
be an issue because the Tristar has no load circuit, your loads will be
powered off of the battery.
I'll put my installer hat back on here and say that I always prefer the
least complex solution.
The 24 volt configuration with the single converter would be that
solution and also provide LVD.
Roy Butler
Morningstar Technical Support
On 12/19/2024 9:51 AM, Mark Frye via RE-wrenches wrote:
My equipment has both 12 V and 24 V each at about 60W.
I was planning to run a Prostar at 24V and then use a DC DC converter
for the 12 V load.
That looked like 2 x 285 AH AGM and 2x 320 W PV.
Now I have to go to a darker place and may have to double the battery
and the PV.
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.
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.
Any thoughts one way or the other?
Thanks,
Mark Frye
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