beam : Message: Re: [beam] Re: How to Imitate a Solaroller's Solar Cell?

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How to Imitate a Solaroller's Solar Cell?

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Message #36611 of 59779 |

Re: [beam] Re: How to Imitate a Solaroller's Solar Cell?

Here is a correction to the original SIMSC1 circuit and some variations on
the theme.

SIMSC1a adds D2 so that the output current starts at 0 ma.
Since the LM358 opamp output current was limited to 30ma I added an NPN
output transistor to provide up to 100ma of current. I tweaked some
component values for the wider output current adjustment range.

SIMSC2 uses a LM324 with two opamps in parallel to boost the output current
to 60ma. The 1ohm resistors help to share the current.

SIMSC3 shows a simpler but less accurate discrete version of a solar cell
simulator. It uses the relatively stable voltage of a "fresh" 9V battery as
the "reference", however the current and voltage adjustment will drift when
the battery voltage drops. For small currents (<10ma) a fresh 9V alkaline
battery should be good for many hours.

wilf

----- Original Message -----
From: "J Wolfgang Goerlich" <jwgoerlich@...>
To: <beam@yahoogroups.com>
Sent: Friday, May 16, 2003 4:52 AM
Subject: [beam] Re: How to Imitate a Solaroller's Solar Cell?

> Wilf wrote:
> > Have a look at the Simulated Solar Cell (SIMSC) circuit in the file
> > section.
>
> Thank you! Looks like just what we need. I will build this and try it
> out.
>
> J Wolfgang Goerlich
>
>
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Message #36611 of 59779 |

Expand Messages	Author	Sort by Date
My goal is to provide a consistent power source for the Bets1 STP. I think that imitating how a solaroller's solar cell would be best as it is clearly defined...	J Wolfgang Goerlich jwgoerlich_us	May 12, 2003 12:30 pm
I've just repeated some tests on a Sunceram 2433 solar cell. The 2433 was positioned 50 cm from a single 500 watt halogen light. the solar roller rules call...	mycroft2152	May 12, 2003 9:12 pm
... Just so John, aka our friendly Laminar Gerbil. I am approaching my Bets1 work as building a dynamometer. It makes sense to test a solar engine using an...	J Wolfgang Goerlich jwgoerlich_us	May 14, 2003 10:20 am
J, The STP sounds good. It references a well known set of standardized conditions. I would add one clarification. The 50 cm distance is measured from the front...	mycroft2152	May 14, 2003 11:17 am
I did not mean that your test setup would be a particular light and your cells are so many cm from the source. I meant something easier. Someone would...	laminar gerbil laminargerbil@...	May 14, 2003 7:44 pm
... It's good, but considering the wear of the solar panels, I think that a simulated setup would be better. And even better would be to run the power for...	Ori ori_barbut	May 14, 2003 9:41 pm
I found the solar simulator circuit Wilf posted in response to Tim Smith [1,2]. I have attached the file, and I have the following questions: Will this circuit...	J. Wolfgang Goerlich jwgoerlich_us	May 14, 2003 10:29 am
... Circuit A would work with a 3.3v battery (not that I've seen any, two fresh AA alkaline cells ~3.2v is the closest I can think of) and a resistor value ...	Martin Jay McKee martinjaymckee	May 15, 2003 8:34 am
Have a look at the Simulated Solar Cell (SIMSC) circuit in the file section. Also good for charging small NiCd batteries. wilf...	wilf_nv	May 15, 2003 5:25 pm
I have corrected the SIMSC schematic in http://groups.yahoo.com/group/beam/files/simSC1.gif and changed some component values to lower the voltage drop across ...	wilf_nv	May 15, 2003 10:00 pm
... Thank you! Looks like just what we need. I will build this and try it out. J Wolfgang Goerlich...	J Wolfgang Goerlich jwgoerlich_us	May 16, 2003 11:52 am
Here is a correction to the original SIMSC1 circuit and some variations on the theme. SIMSC1a adds D2 so that the output current starts at 0 ma. Since the...	Wilf Rigter wilf_nv	May 16, 2003 5:12 pm
Wilf, SIMSC3 seems the simplest to build. What changes would be needed if a 78L05 wwas used for a more stable reference? Another question, how would the...	mycroft2152	May 16, 2003 6:32 pm
Hi Mic, ... From: "mycroft2152" <mycroft2152@...> To: <beam@yahoogroups.com> Sent: Friday, May 16, 2003 11:31 AM Subject: [beam] Re: How to Imitate a...	Wilf Rigter wilf_nv	May 16, 2003 10:34 pm
Thanks Wilf, very helpful explanation. Since most BEAMers are familiar with the 78L05 volotalge regulator, how would it's performance fit in when set up as a...	mycroft2152	May 16, 2003 10:56 pm
Hi Mic, This is what it would look like. The 10K pot is adjusted for currents from 0.5 ma to 100 ma. Since there is a constant 5V across the pot the current is...	Wilf Rigter wilf_nv	May 17, 2003 1:32 am
Hi Wilf, just a question: can I have problem about the pot. power dissipation when the 78L05's output is near the end of potentiometer (circuit output) ? Can I...	Domenico d_mancini	May 17, 2003 2:09 pm
Small trim pots would run hot. Just add a 50 ohm 1/4W resistor and a LED in series with the wiper. It gives a visual indication and reduces power in the pot....	Wilf Rigter wilf_nv	May 17, 2003 5:45 pm

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