Inverter Load Analysis [RE-wrenches]

[Darryl Thayer]

Just an observation.  When the battery set gets low,
it takes a lot of energy to recharge.  It acts as if
the battery efficency is very poor.  When the customer
is low on battery power and they run the genny to
recharge and equalize it takes a very long time and
subsequently a lot of fuel.  
Has anyone else noticed?

Darryl

--- Matt Tritt <solarone at charter.net> wrote:

> 
> Here in coastal Central California, inland clients
> have the heaviest 
> loads in the summer; typically from swamp coolers
> and refrigeration (not 
> to mention the occasional 48" Mondo TV), with
> furnace fans being the 
> biggest loads in the Winter. I generally will design
> for Summer and 
> install the best industrial-grade genny as possible
> for Winter AND 
> stress periods in Summer.
> 
> By stress periods, I mean those times when it's so
> bloody hot that 
> module efficiency falls and cooler use goes through
> the roof (so to 
> speak). I had a call last week from a customer
> whose' inverters had shut 
> down from low battery, in spite of 3000 Watts of PV
> (900 Watts of it on 
> a dual-axis Wattsun), relentlessly sunny skies AND a
> 1200 AH industrial 
> battery. 2 weeks of >100 degrees can really have an
> impact! I had him 
> run his 15 kW Kohler for 3 hours, which seems to
> have brought things 
> back into normal ranges. I hope.
> 
> Matt T
> 
> Todd Cory, Mt. Shasta Energy Services wrote:
> Our moisture is seasonal, in the winter. Because of
> that it is not 
> practical to size a off grid system for the winter.
> To size for the 
> winter would require an impractical, gigantic
> battery bank. I size for 
> no generator use for the 7 or 8 months of full sun
> weather we have and 
> advise the customer that some generator run time
> will be necessary in 
> the winter.
> 
> >
> > Todd



		
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