Inverter Load Analysis [RE-wrenches]

[Joel Davidson]

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It's good to give prospects summer and winter system designs so they can 
make a choice. Often in places that get half as much sun in winter, summer 
system sticker shock turns off a prospect otherwise open to PV. Local custom 
and availability of gen sets is another reason for offering PV/gen set 
hybrids. Windpower in winter is also an attractive lower cost way to wean 
the mechanically inclined away from their gen set.

Question 1: Do you all have a few, some or many PV/gen set customers who 
expand their PV systems and phase out the genny or do they stay with their 
initial system?

Question 2: How many of you all have never sold a gen set?

Joel Davidson

----- Original Message ----- 
From: "Barbra Kerr" <bkerr at energy-exchange.org>
To: <RE-wrenches at topica.com>
Sent: Friday, July 29, 2005 8:30 PM
Subject: Re: Inverter Load Analysis [RE-wrenches]


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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
President
Kerr Enterprises, Inc
1-800-886-2258

Jonathan's comment about sizing for summer
>>>
>> Ray-
>
> To keep costs reasonable, I usually size systems for summer conditions. 
> When it's less sunny, they can supplement with the genny until they can 
> afford more modules. customers tend to use a lot less power when the 
> option is the generator.
> -- 
> Jonathan Hill, solar applications engineer
>

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