I've got some old systems running the QO breakers at 48 v nominal, but
the Voc of the array could be over 80. Never an issue, but I agree just
swap out that load center, since its that old. Midnite has good stuff.
If you're just running to a an FM80 or similar with 150 v limit, their
regular breakers are 150 vdc rated. I only use the 300 v rated breakers
with the new FM 100 that can take 300 vdc.
Ray Walters
Remote Solar
On 10/25/2021 6:45 PM, Chris Sparadeo wrote:
Hi Jeremy,
According to the QO cut sheet the answer is 48VDC:
https://download.schneider-electric.com/files?p_Doc_Ref=0730CT9801
My guess is that your string voltage would be much greater than that.
Not sure your exact application, but for the slight added cost, I
would definitely suggest using a reputable NEMA3R combiner/disco with
300VDC breakers and throwing away the ancient load center.
On Mon, Oct 25, 2021 at 8:30 PM Jeremy Rodriguez
<allsolarjer...@msn.com> wrote:
Hello
Does anyone have a definitive answer to the DC rating of the QO
circuit breakers? I’ve got a potential client with an existing
AC load center (>20 yrs) being used for his array combiner.
He’s looking to add to the array, with modules that are higher
voltage of course.
Thanks in advance.
Jeremy Rodriguez
Solar Installation / Design Expert
All Solar, Inc.
1453 M St
Penrose Colorado 81240
Sent by Jeremy's iPhone. Sorry for typos and shorthand.
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