Posted by Eeyore on August 13, 2008, 3:52 am
m II wrote:
> SteveC wrote:
> > looking to get some lights and small power usage devices running on solar
> > power for my shed. I seen this solar panel/inverter/controller (54 Watts)
> > at my local costco for about $299, and I would have to buy my own Deep Cycle
> > Batteries. Will this do what I need? How many batteries would I need, 2-3
> > batteries? This will be mostly used for lights.
> Be careful with the ratings. What they do is advertise the inverter or
> controller rating as the actual power, not the panel output. It's
> deceptive advertising at best, and downright crooked at worst.
> Could you find out what the panel output is? If it actually IS 54 watts,
> that setup is a bargain. That's why I don't believe it.
> With LED lights, it will work well. Don't use fluorescents, as they
> don't like to start in the cold. They may have changed that recently,
> but it pays to check the specs on the bulb packaging.
LEDs still don't remotely match CFLs for efficiency.
Graham
Posted by DG on August 13, 2008, 10:48 am
Eeyore wrote:
>LEDs still don't remotely match CFLs for efficiency.
Many new LEDs are more efficient than CFLs. LEDs also have the
advantage of a longer life.
-= http://www.flickr.com/photos/rosepetal236/ =-
Posted by Eeyore on August 13, 2008, 4:35 pm
DG wrote:
> Eeyore wrote:
> >
> >LEDs still don't remotely match CFLs for efficiency.
> Many new LEDs are more efficient than CFLs.
Show me the data.
> LEDs also have the advantage of a longer life.
That's perfectly true.
Graham
Posted by Eeyore on August 13, 2008, 4:38 pm
Mark F wrote:
> DG wrote:
> > Eeyore wrote:
> > >
> > >LEDs still don't remotely match CFLs for efficiency.
> >
> > Many new LEDs are more efficient than CFLs.
> I thought they were 5 to 10 times more efficient,
You have to off you mind !
> but the recent numbers that I see suggest 1.5 times more efficient.
None that I've some across (except possibly selected units in
development) and I have been looking at the best. LEDs' efficiency also
drops off as you put more power into them.
Try looking at manufacturers' sites rather than half-assed blogs.
Graham
Posted by Eeyore on August 15, 2008, 8:52 am
Bill Kaszeta / Photovoltaic Resources wrote:
> LEDs do not waste light by shining it out on all sides, so the fixture
> efficiency is high.
Fine if you don't want diffuse light. Personally I do.
> A CFL in a fixture has an optical efficiency of 60% or lower.
Use less complicated lamp shades. I use those Chinese globe things a lot.
Graham
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> > looking to get some lights and small power usage devices running on solar
> > power for my shed. I seen this solar panel/inverter/controller (54 Watts)
> > at my local costco for about $299, and I would have to buy my own Deep Cycle
> > Batteries. Will this do what I need? How many batteries would I need, 2-3
> > batteries? This will be mostly used for lights.
> Be careful with the ratings. What they do is advertise the inverter or
> controller rating as the actual power, not the panel output. It's
> deceptive advertising at best, and downright crooked at worst.
> Could you find out what the panel output is? If it actually IS 54 watts,
> that setup is a bargain. That's why I don't believe it.
> With LED lights, it will work well. Don't use fluorescents, as they
> don't like to start in the cold. They may have changed that recently,
> but it pays to check the specs on the bulb packaging.