MPP and battery charging. [RE-wrenches]

matthew tritt solarone at charter.net
Fri Jun 20 17:26:17 PDT 2003


Christopher,

I agree with your Holy Grail comment. People that run off-grid systems NEED
to visit their battery rooms and electronics on a regular basis to keep in
touch with what's really going on with their systems. Better to keep things
simpler and have them actually work.

Matt T----- Original Message ----- 
From: "Christopher Freitas - OutBack Power" <cfreitas at outbackpower.com>
To: <RE-wrenches at topica.com>
Cc: <rgudgel at outbackpower.com>
Sent: Friday, June 20, 2003 11:54 AM
Subject: RE: MPP and battery charging. [RE-wrenches]


> Darryl Thayer wrote:
> > The 3000 watt system is charging through 3 RV products MPPTs. There is
> > no link between these controllers, could it be that the controllers do
> > not work well when in parallel without master slave relation?  And can
> > the MX60 work with other MX60?
>
> Yes - multiple OutBack MX60s will work together "out of the box" without
> any special wiring or master slaving required.  We considered a
> requirement for the design from day one.  We also worried a lot about
> working with multiple C40s, SW inverters - and yes - even on systems
> with mixed MPPT controllers.
>
> Requiring inter-communication, special wiring, external shunts etc. for
> the MPPTs to work together is a band-aid to underlying problems.  If it
> is designed correctly from the start it simply is not necessary or
> desireable.  Inter-communicating should be used to improve the operation
> (such as allow easy viewing of the meters or a single temp sensor
> coordination) but should not be required for proper operation together.
> A system should still operate correctly with the communication not
> functioning when possible.
>
> Making system "communicate" is not the "holy grail" or some ultimate
> solution - it can actually just result in more problems if not done
> correctly.  Making products that work together properly under a variety
> of conditions is the best solution.  Having separate communication
> systems for the charge controllers and the inverters sounds like a real
> mess to me.
>
> Christopher Freitas
> OutBack Power Systems, Inc.
> cfreitas at outbackpower.com  www.outbackpower.com
> Tel 360 435 6030  Arlington WA USA
>
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