Midnite Solar has the Classic 250, which can go to at least 250 v array
open circuit plus it has an additional emergency voltage head room that
is equal to the battery voltage. So if you had a 48 v battery, you could
go to 298 vdc Open circuit (in extreme cold for instance) without
damage. The Classic controller shuts off above 250 v though, so you
don't want to design the system to operate that high, but it does give
you some breathing room with the design.
Also on the "overkill" issue of a 1 Kw array, it all depends on the
battery voltage. At 24 v battery, the Classic 250 can handle a maximum
of 1722 watts. Personally I've found controllers seem to last longer
when over sized, rather than over loaded.
Ray Walters
Solarray, Inc.
On 11/4/2011 5:22 PM, Carl Emerson wrote:
Hi John,
Yes I have seen this one thanks.
I should have mentioned that the array will be about 1 kW so a unit that
size is overkill...
Carl Emerson
Free Power Co.
Web www.freepower.co.nz
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of John
DeBoever
Sent: 5 November 2011 12:13 p.m.
To: '[email protected]'
Subject: Re: [RE-wrenches] High Voltage MPPT units
Schneider Electric just launched their MPPT 80-600, which is a 80A , up to
600 V.
John
Trojan Battery Company
----- Original Message -----
From: Carl Emerson [mailto:[email protected]]
Sent: Friday, November 04, 2011 07:08 PM
To: 'RE-wrenches'<[email protected]>
Subject: [RE-wrenches] High Voltage MPPT units
Hi there,
I have heard that Morningstar are bringing out a high voltage MPPT unit next
year.
This unit will run up to 600 Volts.
In the mean time what other units are available that allow for higher than
150 VDC from the array.
I want to avoid the expense of using a Sunnyboy at the array and bringing AC
back to the inverter.
Trying to keep cable costs down.
Many Thanks,
Carl Emerson
Freepower
Auckland NZ.
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