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Search: Posts Made By: mcn14
Forum: Solar Power 03-14-15, 12:13 PM
Replies: 142
Views: 98,146
Posted By mcn14
Why don't you use a zener diode to protect pin 2...

Why don't you use a zener diode to protect pin 2 from over voltages?
Forum: Solar Power 03-14-15, 09:56 AM
Replies: 142
Views: 98,146
Posted By mcn14
Sorry when i meant VCC i didn't mean the VCC of...

Sorry when i meant VCC i didn't mean the VCC of the IC:)

I meant the voltage going into the voltage divider.

But it think iv got the concept now - assuming that you have a reference of 5V on...
Forum: Solar Power 03-14-15, 08:29 AM
Replies: 142
Views: 98,146
Posted By mcn14
Yes, iv used that formula, but the thing is you...

Yes, iv used that formula, but the thing is you want to find the firing voltage so in this case its going to be the VCC of the voltage divider, so regardless of what values you plug into the equation...
Forum: Solar Power 03-14-15, 07:53 AM
Replies: 142
Views: 98,146
Posted By mcn14
Hello again, Iv built the circuit and its...

Hello again,

Iv built the circuit and its working, I can see that with different levels of sunlight I can maximize the power going into the load by adjusting the pot. However I want to do some...
Forum: Solar Power 03-03-15, 05:44 AM
Replies: 142
Views: 98,146
Posted By mcn14
In your previous post you said: If you see...

In your previous post you said:

If you see the motor running really fast, and your PV voltage is high,
like above the MPP voltage, that means your motor load is light..
Or the sun is extra...
Forum: Solar Power 03-02-15, 11:18 AM
Replies: 142
Views: 98,146
Posted By mcn14
Ok I understand, so there's no way I can...

Ok I understand, so there's no way I can continuously have the panel operating at the maximum power point?

Because my aim was to always have the panel operating at the maximum power point 17.6V,...
Forum: Solar Power 03-02-15, 07:49 AM
Replies: 142
Views: 98,146
Posted By mcn14
http://www.digikey.com/en/articles/techzone/2013/d...

http://www.digikey.com/en/articles/techzone/2013/dec/~/media/Images/Article%20Library/TechZone%20Articles/2013/December/Maximizing%20the%20Output%20from%20Solar%20Modules/article-2013november-maximizi...
Forum: Solar Power 03-02-15, 07:49 AM
Replies: 142
Views: 98,146
Posted By mcn14
If you look at the IV characteristics of a solar...

If you look at the IV characteristics of a solar panel (like the one shown below) you can see that as the voltage of the solar panel tends towards the VOC the current starts dropping towards 0.
...
Forum: Solar Power 02-21-15, 01:34 PM
Replies: 142
Views: 98,146
Posted By mcn14
I will test it tomorrow with your suggestions. ...

I will test it tomorrow with your suggestions.

If I plug the DC motor straight to the solar panel without this circuit, the motor does not even start. It draws a lot of current and the Panel...
Forum: Solar Power 02-21-15, 12:54 PM
Replies: 142
Views: 98,146
Posted By mcn14
Thanks for all information, I did some...

Thanks for all information,

I did some testing this afternoon and I think the circuit is working now.

The PV voltage never falls below a certain voltage (which is adjusted by the pot).

Is...
Forum: Solar Power 02-21-15, 07:49 AM
Replies: 142
Views: 98,146
Posted By mcn14
Thank for your reply, I can see its been a while...

Thank for your reply, I can see its been a while you've last looked into this :)

I will try your advice.

My load is a 6- 15V range DC motor, so i think it has a really low internal resistance....
Forum: Solar Power 02-20-15, 03:19 PM
Replies: 142
Views: 98,146
Posted By mcn14
Hi,I really like this circuit and have built the...

Hi,I really like this circuit and have built the circuit, however I am having a few issues.

I have a 100w solar panel which has a sweet spot of 17.5V. The 2K pot on pin 3 is arranged in such away...
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