# pulse width modulated voltage controller for solar panels

#### twister007

Joined Feb 29, 2012
48
I am building a solar panel pulse width modulated voltage regulator to control the charge to my batteries. I am wondering what frequency to use?

#### THE_RB

Joined Feb 11, 2008
5,438
Sorry this is not what you asked, but have a look on ebay, it is full of cheap $20 solar panel controllers, and many are quite nice with displays etc. You couldn't build one for that price. Thread Starter #### twister007 Joined Feb 29, 2012 48 Sorry this is not what you asked, but have a look on ebay, it is full of cheap$20 solar panel controllers, and many are quite nice with displays etc. You couldn't build one for that price.
It's a sad day when parts cost more than the finished product. Electronic parts sellers are getting filthy rich.
It's a sad day when slave labor is used to make people filthy rich.
It's a sad day when nobody wants to build anything anymore.
It's a sad day when nobody wants to help anymore.

#### THE_RB

Joined Feb 11, 2008
5,438
That's a little harsh, I've spent a big chunk of my life "building things" and helping others build things. My reply was offering good advice, that you could easily buy something to the do the job for you.

If you are determined to build one I respect that too, and suggest that you post some details of panel and battery type and info on your level of experience and tools so that people may find it easier to help you.

#### evilclem

Joined Dec 20, 2011
116
Any frequency that doesn't affect the load should be fine.

#### twister007

Joined Feb 29, 2012
48
Any frequency that doesn't affect the load should be fine.
Thanks for that info. I just got it working on a breadboard today. I set the frequency at 15HZ. So I guess I'll see how that works out.

#### THE_RB

Joined Feb 11, 2008
5,438
What, you're you're willing to post criticism of someone's suggestion, but not willing to post info on your parts to allow people to help you?

...
It's a sad day when nobody wants to help anymore.
I think you are going to have lots of sad days ahead.

#### gregj64

Joined Mar 14, 2012
3
On this note I've found this article quite useful for understanding solar panel charging of lead acid batteries.

Starts at the very basic, the good stuff is at the end!
http://www.mpoweruk.com/solar_power.htm

#### anotheruser1

Joined Dec 6, 2011
30
I own a 20 amp solar charger from ebay, I paid somewhere around \$25 shipping and all. It works great so far, and for the price I didn't see trying to build one.