James Cormican's posts

Posted by James Cormican on Aug 2, 2006 06:23 pm

#571 -  Renewable Energy > Technical Discussion: Other > Re: New to solar power and need help.
I agree with steve.  The battery may not be of a type that is a deep discharge renewable energy battery.  because of this, it may not like to be discharged very deeply over long periods of time.  also, batteries do not like severe heat or cold. 

it is important to know how many hours the pump runs so we can then figure the watt hours.  although it is likely that a 100w panel will provide suffiecient energy to your load, it would be nice to make sure. 

please feel free to caontact me with any other questions, and thanks for the post, hope this helps.

james - alt-e staff
 

Posted by James Cormican on Jul 31, 2006 03:29 pm

#572 -  Renewable Energy > RE General Discussion > Re: 12V 16" DC venturi fan
Hey guys,

I checked on availability and they are back-ordered for a month. 

Regarding the junkyard fan idea:
that should work fine if you are using 12v battery.  If you intend on going pv direct, however, the motor will not likely appreciate the 16-18 vdc that a solar panel would supply.  It may tolerate it, but I suspect it may have a narrower voltage window since it was designed to be powered by a battery.

just an fyi, this item is not like a solar attic fan.  It is just a dc fan.  we also sell a kit with the dc fan and the pv panel.  the solar attic fan is different and you can get that from us as well as other retailers.  There are several brands, but we carry natural light, who were just featured in home power magazine #112.

feel free to contact me with any questions.

- james -Alt-E staff
877-878-4060 x107
james @ altenergystore.com
 

Posted by James Cormican on Jul 24, 2006 12:07 pm

#573 -  AltE > Discussion > Re: Setting up solar system
hi greg,

give me a call and I can help you sort out your system.  Once we figure out what you have and what should be done, I will write it in a post later.  the fundamentals are that overcurrent devices go on the positive, the fuses are sized based on what the panel says the max series fuse rating is (or 1.56 x ISC) and the charge controller disconnect for 25a charge controller will be either 20 or 30a depending on what kind it is.

james- Alt-E staff
 

Posted by James Cormican on Jul 21, 2006 01:07 pm

#574 -  Renewable Energy > RE General Discussion > Re: The Strive to be independant
okay, for the solar.

parallel is + to + and - to -.  Putting things in parallel is current additive.  that is current increases, voltage remains constant, power increases.

Series is + to -.  Putting things in series is volttage additive.  Voltage increases, current reamains the same, power increases.

The way you orient the panels in series/parallel configuration depends on your system voltage and the type of charge controller you select.

 The way you go about sizing the system you need is based on the watt-hours you require. the only way you know what size array is sufficient for you is to do the calculations of what you need and then size the pv for about 125% of that to take into account inefficeincies.  You will be different since you will have wind contributing as well.  lastly the panels you have selected are known to be scarce and may not be available.  Isofoton makes good modules but you would be more likely to get your hands on the 150 24v variety here in the states.

the post berfore me is right, get your hands on home power magazine.  the solar cds are very helpful.  Also check out the books on the website, especially "photovoltaics design and install manual" it is very good and I keep a copy handy here at work.  please feel free to contact me with any questions.

-james -- Alt-E staff
 

Posted by James Cormican on Jul 20, 2006 02:57 pm

#575 -  Renewable Energy > RE General Discussion > Re: Finanching off the grid
Hi debra,

I used to live in new mexico, so I have some sources for you to go to.  Contact the nmsea (new mexico solar energy assoc) and see what info they have for you.  Every year in late summer/early fall they host the solar fiesta in ABQ and there are many booths filled with retailers, installers, manufacturerers, my alma mater San Juan College, and a few banks and credit unions that can help you with your financing question.  Try asking the folks at homepower or mother earth news magazines if they have heard of any new financing options as well.  Realize that the better you can have things documented, the better your chances are.  Get a reputable installer involved along with local electrical inspector (before trying to get financing) and your chances may get better.

take care and good luck,

james - Alt-E staff
 
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