[RE-wrenches] Off-Grid Sizing Case

[robert ellison]

On this area of Northern New York i have not had over .30 KWH (300
watts) per day over the last week.... and thats the high day, most have been
.10 or none, none being the most common. Thats off a 1400 watt rack of SW
panels

Up here you size in a generator or go south for the winter.

Tell me again why i live here, any thoughts Roy? You can't be doing any
better....

Bob

On Thu, Dec 10, 2009 at 9:29 AM, Darryl Thayer <daryl_solar at yahoo.com>wrote:

> The system is way short on PV, and I would think that it is already a Gen
> with PV support.  I agree with everybody more PV is the way to go but the
> batteries must be cooked by now with this many Deep cycles.  BTW C/10 is not
> important, in fact I feel better if I charge slower.  I know fast charging
> is a good way to kill batteries.  Operating cost needs a high efficiency
> engine.  So until you can get the PV up to become the dominant source, a gen
> is probibly in order.  I tend to use smaller generators than most people,
> and the fuel efficency of a Honda inverter gen is hard to beat.
>
> --- On Thu, 12/3/09, Windsun at wind-sun.com <windsun at wind-sun.com> wrote:
>
> > From: Windsun at wind-sun.com <windsun at wind-sun.com>
> > Subject: Re: [RE-wrenches] Off-Grid Sizing Case
> > To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> > Date: Thursday, December 3, 2009, 12:18 PM
> >
> > Off-Grid Sizing Case
>  >
> >
> >
> >
> >
> > The rate of charging is not the
> > real problem in most
> > undersized systems, it is the fact that the batteries
> > seldom, if ever, get fully
> > charged. Given the ratio of PV vs battery capacity, I would
> > suspect that their
> > batteries have been chronically undercharged for ages. We
> > usually recommend
> > around 1 watt of pv per AH for a 12 volt system, 2
> > watts for 24 volt
> > etc.
> >
> > A generator is not usually the
> > answer, because it may
> > have to run for hours to get that final 5-15% of charge
> > into the batteries.
> > Generators are good for equalizing, not so much for general
> >
> > charging.
> >
> >
> ..................................................................................................
> > Northern
> > Arizona Wind & Sun - Electricity From The Sun Since
> > 1979
> > Solar Discussion
> > Forum: http://www.wind-sun.com/ForumVB/
> >
> ..................................................................................................
> >
> >   ----- Original Message
> > -----
> >   From:
> >   Mark
> >   Frye
> >   To: 'RE-wrenches'
> >
> >   Sent: Thursday,
> > December 03, 2009 10:56
> >   AM
> >   Subject: Re:
> > [RE-wrenches] Off-Grid
> >   Sizing Case
> >
> >
> >   So being able to achieve C10
> > charging from the PV is not so
> >   important?
> >
> > Mark
> > Frye
> > Berkeley Solar
> > Electric
> >   Systems
> > 303 Redbud
> >   Way
> > Nevada
> >   City,  CA 95959
> > (530) 401-8024
> > www.berkeleysolar.com
> >
> >
> >
> >
> >   From: re-wrenches-bounces at lists.re-wrenches.org
> >
> >   [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
> > Behalf Of Windsun at wind-sun.com
> > Sent:
> >   Thursday, December 03, 2009 9:51 AM
> > To:
> >   RE-wrenches
> > Subject: Re: [RE-wrenches] Off-Grid Sizing
> >   Case
> >
> >
> >
> >   I would go with #1.
> > The solar is obviously
> >   undersized for the battery bank he has. Another panel +
> > MPPT should give him
> >   about 25-40% more, depending on temps etc.
> >
> >
> >
> ..................................................................................................
> > Northern
> >   Arizona Wind & Sun - Electricity From The Sun Since
> > 1979
> > Solar
> >   Discussion Forum: http://www.wind-sun.com/ForumVB/
> >
> ..................................................................................................
> >
> >
> >
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