Inverter Load Analysis [RE-wrenches]

[Joel Davidson]

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Jeremy,
I prefer designing expandable systems (More PV!). When all residential 
systems were off-grid and almost all were less than 500 watt arrays, I 
encouraged hundreds of people to buy 4 modules to get 8-module Zomeworks 
trackers. The cost difference between the fixed and tracking mount was 
offset by increased production and they got room to expand.
Joel Davidson

----- Original Message ----- 
From: "Jeremy Rodriguez" <allsolar at ris.net>
To: <RE-wrenches at topica.com>
Sent: Saturday, July 30, 2005 8:15 AM
Subject: Re: Inverter Load Analysis [RE-wrenches]


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If we sell a mount that will hold the extra modules, then yes, the client is
likely to expand, plus we tell them they need to expand soon because they
will likely not be able to find that same module if they wait :).
Every off grid system needs a quality generator.

Jeremy
All Solar
----- Original Message ----- 
From: "Joel Davidson" <joeldavidson at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Saturday, July 30, 2005 8:10 AM
Subject: Re: Inverter Load Analysis [RE-wrenches]


> 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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