What did ever happen to just setting it all up outside in the sun?????

As you can tell, I cannot help you =)


-Mario


Quoting Russell McMahon <apptech@paradise.net.nz>:

>
> I want to create a variable "Standard Sun " to assist the testing of
> small solar panels - up to perhaps 150 mm x  150 mm.
>
> I can undoubtedly create a "good enough result using some mix of
> Dichroic halogens and CFL bulbs. All I want [tm] is something which
> gives similar power outputs for typical solar cells to when they are
> used in sunlight without having such a different spectral distribution
> that the performance is skewed either positively or negatively in some
> manner.
>
> eg If I use just incandescent bulbs the IR component is
> proportionately too high and I may get heating issues which do not
> occur in sunlight * (depending on the spectral response performance of
> the cells used). If I use just CFL bulbs then I may get too low an IR
> component and conclude that eg I can use reflectors to boost a panel's
> output when in real use it would die.
>
> I don't think I will have too too much trouble making something that
> is adequate for my purposes but I may turn out to be sadly mistaken
> :-). Dichroic halogens have the advantage of being easily dimmed,
> although spectral mix will alter. CFLs are not generally dimmable.
> Tube fluorescent may be needed. PWM LED would be good BUT requisite
> lighting levels make this unattractive.
>
> Checks: 100mm x 100mm panel at full sun =  1 kW x 0.1 x 0.1 = 10 Watt.
> Getting 10 Watts OUTPUT from LEDs would be interesting.
>
>> From memory, when I last tried this "some while ago" a 100 Watt
> incandescent at about 150mm gave a 1 sun equivalent over a small panel
> but with too high and IR component.
>
> Thoughts?
>
>
>
>             Russell
>
> * All insolation is potentially heat input but the panel
> efficiency/wavelength curve may make having too much of the "wrong"
> wavelength a problem.
>
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