Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 2 / 4   >   >>
GREAT-Terry
User Rank
CEO
re: Selecting a solar energy conversion method
GREAT-Terry   7/11/2012 3:33:00 PM
NO RATINGS
Very interesting MPPT control method. I like the micro-inverter idea as it is the most efficient way to dump energy to the grid. Managing multiple 200-300W power is much easier than a huge 10kW stuff. Great article!

dave_dne
User Rank
Rookie
re: Selecting a solar energy conversion method
dave_dne   7/10/2012 4:33:03 PM
NO RATINGS
Page 5 of this article says "Comparison is made with a typical Enphase M215, 215W micro-inverter".

HarrisMarcus
User Rank
Rookie
re: Selecting a solar energy conversion method
HarrisMarcus   7/9/2012 9:47:41 PM
NO RATINGS
Using a power optimizer is not complicated and system design is straightforward. For a low voltage lighting application, the power optimizer will allow the maximum amount of power available to be extracted from the panel.

HarrisMarcus
User Rank
Rookie
re: Selecting a solar energy conversion method
HarrisMarcus   7/9/2012 9:46:57 PM
NO RATINGS
Yes you are correct. I should not be thinking only in terms of the northern hemisphere.

HarrisMarcus
User Rank
Rookie
re: Selecting a solar energy conversion method
HarrisMarcus   7/9/2012 9:46:08 PM
NO RATINGS
The power output of a solar panel changes a slight amount with time and this is specified in the panel manufacturer’s data sheet. This case the power optimizer can be used to very good advantage because as the Vmp and Imp points change with time, the SPV1020 dynamically tracks these changes and enables the maximum power available to be extracted from the panel.

HarrisMarcus
User Rank
Rookie
re: Selecting a solar energy conversion method
HarrisMarcus   7/9/2012 9:45:05 PM
NO RATINGS
We are looking at the same thing. The article compared a microinverter delivering 115VAC, not necessarily Enphase which delivers a higher voltage, to a higher voltage, lower current DC system. The SPV1020 has performance monitoring features available through its SPI bus that include input voltage, input current and duty cycle. Output voltage can be computed from input voltage and duty cycle.

selinz
User Rank
CEO
re: Selecting a solar energy conversion method
selinz   7/9/2012 8:46:44 PM
NO RATINGS
Interestingly, a solar panel sales guy came by on the day that this article was published. I was astonished to find out that I could actually save money immediately. It turns out that we use double the "average" user and for anything beyond the norm, the 15 cents/kwh goes to about 30cents/kwh. Thank you PGE. This makes getting enough panels to knock our electricity useage in half has a quick payback period. (7-8 years). If you are a do it yourselfer, it can be even less. see http://www.wholesalesolar.com/enphase-solar-power-system.html for example pricing. And no, I am in no way affiliated with these folks. They popped out of a simple google search. YMMV.

HarrisMarcus
User Rank
Rookie
re: Selecting a solar energy conversion method
HarrisMarcus   7/9/2012 8:40:28 PM
NO RATINGS
Additional information. Optimizers can be used for batteries as well as AC grid systems. STMicroelectronics has an evaluation board with P/N STEVAL-ISV005V1 that uses the SPV1020 and SEA05 constant voltage constant current controller to charge a 240W lead acid battery.

HarrisMarcus
User Rank
Rookie
re: Selecting a solar energy conversion method
HarrisMarcus   7/9/2012 8:39:00 PM
NO RATINGS
You would need to monitor the panel output voltage and input voltage.. This can be done through the SPI bus in the SPV1020. The SPI bus provides a direct measurement of input voltage, input current and duty cycle. Output voltage can be computed by Vout = Vin/(1-du).

HarrisMarcus
User Rank
Rookie
re: Selecting a solar energy conversion method
HarrisMarcus   7/9/2012 8:37:41 PM
NO RATINGS
The article you provided is very thorough and detailed. Thank you. You cannot get more power out than you have coming in.

<<   <   Page 2 / 4   >   >>


Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Curiosity Killed the Cat (Just Call Me Mr. Curiosity)
Max Maxfield
10 comments
My wife, Gina The Gorgeous, loves animals. She has two stupid dogs and two stupid cats. How stupid are they? Well, allow me to show you this video of the dogs that I made a couple of years ...

Martin Rowe

No 2014 Punkin Chunkin, What Will You Do?
Martin Rowe
Post a comment
American Thanksgiving is next week, and while some people watch (American) football all day, the real competition on TV has become Punkin Chunkin. But there will be no Punkin Chunkin on TV ...

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
13 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Martin Rowe

Book Review: Controlling Radiated Emissions by Design
Martin Rowe
1 Comment
Controlling Radiated Emissions by Design, Third Edition, by Michel Mardiguian. Contributions by Donald L. Sweeney and Roger Swanberg. List price: $89.99 (e-book), $119 (hardcover).