Inverter Load Analysis [RE-wrenches]

[Matt Tritt]

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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
>
>
> Barbra Kerr wrote:
>
>> Jonathan-
>> Your comment about sizing for summer came as a surprise to me, as I 
>> was trained to design for winter.  I understand all too well the 
>> rationale for doing so, as I have lost too many bids in the 
>> low-competition off-grid market in my area.
>> Question to all off-grid Wrenches:  Do you do this as well?  If 
>> sometimes - What (besides the clients budget) is your determining 
>> factor to design summer vs winter?
>> Thanks
>> Barbra K Kerr
>>
>
>

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