It is currently Mon Dec 18, 2017 5:13 pm

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 2 posts ] 
Author Message
PostPosted: Thu Nov 16, 2017 5:48 pm 
Offline
ZS Member
ZS Member
User avatar

Joined: Sun Apr 05, 2009 11:58 pm
Posts: 3757
Has thanked: 1549 times
Been thanked: 470 times
I've bought a few of these off of eBay and they are a good bargain for 2.5 Amp or less charging using the MPPT approach to PWM charge controllers

https://www.ebay.com/itm/MPPT-Solar-Cha ... 2749.l2649

Image

This one is based on a chip from Consonance, the CN3767. (Lithium battery versions will use the CN3791 chip) The CN3767 is a charge controller that employs PWM step-down (buck) switching.

I've reversed engineered the PC board components based on the info in the datasheet http://www.consonance-elec.com/pdf/data ... CN3767.pdf

Max current is limited by the large current sense resistor R5 at 0.050 ohms for 2.5 Amps. The MPPT point for the panel is 18 volts as set by R1 & R2, a voltage divider set to apply about 1.25 volts to pin 6. You can adjust the ratio to match your own panel's MPPT voltage point if different..

The eBay listings have a "best offer" button so I've gotten two boards for $12 and free shipping which was not that slow from Hong Kong

Larger image here
http://i.ebayimg.com/images/i/172831351 ... -l1000.jpg

_________________
Most of my adventures are on my blog http://suntothenorth.blogspot.com/" onclick="window.open(this.href);return false;
My Introduction With Pictures: http://zombiehunters.org/forum/viewtopi ... 10&t=79019" onclick="window.open(this.href);return false;
Graduated with honors from kit porn university


Share on FacebookShare on TwitterShare on TumblrShare on Google+
Top
 Profile  
Reply with quote  
PostPosted: Fri Nov 17, 2017 8:21 am 
Offline
ZS Member
ZS Member

Joined: Mon Mar 18, 2013 6:32 am
Posts: 110
Has thanked: 21 times
Been thanked: 14 times
Will make nice upgrades for my solar trickle chargers in my polebarn and BOV. Thx!


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group