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high voltage MPPT

D

David Lesher

Jan 1, 1970
0
Does anyone make a MPPT that accepts ~250V and outputs 48V?
 
Y

You

Jan 1, 1970
0
David Lesher said:
Does anyone make a MPPT that accepts ~250V and outputs 48V?

I believe the Outback MX60 will do half that input voltage.... if you
want more input, I would call Outback and ask....
 
D

David Lesher

Jan 1, 1970
0
m II said:
Ask Outback whether they have ever put two MX 60s in series on the input
and parallel on the output.

As an EE; I'd consider such as insane. I'd get two dead MPPTs.

Why the need for a 250 volt input? If it's solar power, could you not
parallel some panels? They don't recommend the controller for wind and
if you use it on a water turbine, the flow has to be fairly consistent.

I'm using panels on an existing pump system.....4 panels in series.
 
J

Jean-Marc

Jan 1, 1970
0
Would it be stupid to consider a transformer?
 
D

David Lesher

Jan 1, 1970
0
Please explain why. The units have a completely variable input, from
zero to about 150 volts. The laws of a voltage divider circuit will
apply to two in series. To me, that means roughly the same voltage
across each one.

You have no way to ensure the voltage will divide equally across
the two MPPT's. That happens *only* if they always drew equal
currents, and such would a fiction soon exposed.

Then the greater voltage will be across one or the other MPPT,
it will suffer from escaped smoke, and when it does, the full
voltage will likely be across the remaining unit; which then
joins it in the "WAS a MPPT but is now a paperweight" catageory.
 
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