Hybrid Car – More Fun with Less Gas

Repost please: $/watt solar panals. - Page 18

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Posted by Martin Brown on October 29, 2009, 1:46 pm
 


Paul Keinanen wrote:

Although they are cheaply mass produced as emergency standby lights.
And pure solid state LED based units are still more expensive.

Although you really need to pay attention to the current flowing in a
low voltage DC wiring system. It takes a lot more of a percentage when
you drop half a volt off 12v than the same drop on 120 or 240v.

And to deliver the same power into the load takes 10x or 20x the current
on a 12v service. Useful if you are off grid but not so good in winter
at my latitude. Not enough winter sun to keep things topped up.

Wind power is a bit better in that respect if you have the space.

Regards,
Martin Brown

Posted by Dirk Bruere at NeoPax on October 29, 2009, 5:55 pm
 


vaughn wrote:

Does a low voltage DC house supply make sense?
It's looking like it for lighting.

--
Dirk

http://www.transcendence.me.uk/  - Transcendence UK
http://www.theconsensus.org/  - A UK political party
http://www.blogtalkradio.com/onetribe  - Occult Talk Show

Posted by vaughn on October 29, 2009, 7:24 pm
 



   My system is mostly for lighting, with possibly a laptop and a portable
TV thrown in during power failures.  The "40-watt-equiv" 12 volt CFL's that
I use draw 1 amp each.  So far, the most I have on one circuit is 2 of them.
For minimum voltage drop, I wire my interior circuits with #10 THHN wire.

Vaughn

 



Posted by Dirk Bruere at NeoPax on October 29, 2009, 8:25 pm
 

vaughn wrote:

How would one go about powering a laptop from a 12VDC supply? DC-DC
converter? The only things I would likely power from PV would be lights,
computers (laptops) and a fridge.

--
Dirk

http://www.transcendence.me.uk/  - Transcendence UK
http://www.theconsensus.org/  - A UK political party
http://www.blogtalkradio.com/onetribe  - Occult Talk Show

Posted by vaughn on October 29, 2009, 9:16 pm
 



Google the term "laptop auto adapter" for zillions of returns like this:
http://www.powerstream.com/ADC.htm


My 'fridge does not like my square wave inverter (some do, some don't).
Also remember that your defrost heaters can take well over 1,000 watts.  My
present disaster plan is to run my refrigerator only when my generator is
running.

Vaughn



 



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