[RE-wrenches] PWM Controllers in parallel
Ray Walters
ray at solarray.com
Tue May 7 12:49:27 PDT 2024
Rewiring the array is not that hard. Why is he against that? With old
Jbox type modules, it usually is safer too, as those often were
paralleled at the modules, and often over loaded the connectors. It
would also increase his total power output by reducing line losses. I
think a careful inspection of the old array wiring will reveal it needs
rewiring anyway. Folks always blamed lightning for cooked connectors,
when the real culprit was over paralleling. I've seen the connections
get so hot (4th module in parallel) that the j box was melted.
Ray Walters
Remote Solar
On 5/7/2024 1:09 PM, Andrew Perkins via RE-wrenches wrote:
> Sorry yes for clarification that he wants to parallel the INPUTS I am
> aware of paralleling the outputs we do that all the time. Sorry for
> the confusion but seems like the census now says NO on paralleling the
> 2 inputs from one array.
>
> Andrew Perkins
>
> Greenwired
>
> P: 707-923-2001 ext. 100
>
> 1150 #1 Evergreen Rd
>
> Redway, CA 95560
>
> www.greenwired.com <http://www.greenwired.com>
>
>
>
>
>
>
>
> ---- On Tue, 07 May 2024 11:58:37 -0700 *Howie Michaelson via
> RE-wrenches <re-wrenches at lists.re-wrenches.org>* wrote ---
>
> Yes, output not input. Thanks for clarifying that William...
> Howie
>
> *Sun Catcher**/
> /**
> ****Solar Electric Systems Sales & Service
> 802-272-0004*
>
>
> On Tue, May 7, 2024 at 2:55 PM William Miller via RE-wrenches
> <re-wrenches at lists.re-wrenches.org> wrote:
>
> Andrew:
>
>
> I see no problem paralleling the Charge Controller outputs but
> I would not parallel the inputs. With parallel inputs, unless
> there is protection to prevent excessive current, there is a
> risk that one CC will take over and try to regulate the entire
> array.
>
>
> I suggest you divide up the panels to create one appropriately
> sized discrete array into each CC. You can parallel two
> strings of panels without OCPD.
>
>
> William
>
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com <http://www.millersolar.com/>
>
> CA Lic. 773985
>
>
>
> *From:*RE-wrenches
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On Behalf
> Of *Andrew Perkins via RE-wrenches
> *Sent:* Tuesday, May 7, 2024 9:24 AM
> *To:* Re Wrenches
> *Cc:* Andrew Perkins
> *Subject:* [RE-wrenches] PWM Controllers in parallel
>
>
> Hello Wrenches,
>
> I have a client who has a large 2000 watt 12v array
> that he said used to be hooked into an internal solar charger
> on his old trace. Never seen a trace with one of those in it
> but he claims it could do 200a. This internal charger has now
> died and needs a replacement. He is refusing to rewire his
> panels into a new configuration and their aren't many options
> for him out there. I did get him a Coleman Aire 400a Charge
> controller but it is more of a load controller and wants to be
> able to properly absorb is batteries off the sun. He currently
> has a c60 running only part of the array and now he is asking
> about running another c60 in parallel. Not quite sure if this
> would work or not but my gut feeling says no and there will be
> problems.
>
>
> If anyone knows of any controllers that would fit that or if
> running those in parallel works your advice would be greatly
> appreciated.
>
>
> Andrew Perkins
>
> Greenwired
>
> P: 707-923-2001 ext. 100
>
> 1150 #1 Evergreen Rd
>
> Redway, CA 95560
>
> www.greenwired.com <http://www.greenwired.com>
>
>
>
>
>
>
>
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