[RE-wrenches] High Voltage MPPT units

Carl Emerson freepower at freepower.co.nz
Fri Nov 4 16:47:24 PDT 2011


Hi Ray and Dan,

Thanks for that, the bank is 48V so that sounds like a very good solution.

Carl Emerson
Free Power Co.
Land line +64 9 473 4286
Mobile +64 22 630 9689
Email   emerson at freepower.co.nz
Web   www.freepower.co.nz


-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Ray Walters
Sent: 5 November 2011 12:37 p.m.
To: RE-wrenches
Subject: Re: [RE-wrenches] High Voltage MPPT units

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: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of John
> DeBoever
> Sent: 5 November 2011 12:13 p.m.
> To: 're-wrenches at lists.re-wrenches.org'
> 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:freepower at freepower.co.nz]
> Sent: Friday, November 04, 2011 07:08 PM
> To: 'RE-wrenches'<re-wrenches at lists.re-wrenches.org>
> 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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