The new voltage and current sensors on the battery side mean that Watts in and Watts out can be measured and an efficiency percentage calculated. High efficiency values (96% - 97%) are achievable when the buck converter is stepping down from 18v to 12v. With a 72-cell panel and the converter stepping 35v down to 12v, the efficiency drops to around 88%.
Code for this project is now available on my website:
http://www.256.co.uk/?p=1104 and
http://www.256.co.uk/?p=1107
Code for this project is now available on my website:
http://www.256.co.uk/?p=1104 and
http://www.256.co.uk/?p=1107
Oo
nice explanation, nice channel btw very educate, btw the links are down. thanks
what if I like a 100khz PWM is it possible? how?
Website is not working? Neither is Tim Nolan's. Must be the the MPPT mafia again!
Something in this video is giving off a really nasty high pitched whine (17500Hz or so at a guess) normally when you're playing about with the dial. May be worth looking into if you can't hear it because others will be able to.
What the Frequency of PWM in arduino to switch?
What Method of MPPT you uses?
I guess so – I've never tried it. But a solar charge controller will be more efficient, will do a better job (with it's multiple charge stages) and lose less power overnight.
can i use a LM2596 dc dc converter as a solar panel regulator to charge a car battery
damn, 101% efficient! screw you thermodynamics! 🙂
That's a really good little article – thanks. I really don't know much about inductors – something I need to learn.
Julian, check out this project on ferrite by Elm-chan.
The explanation and graphs are fantastic:
elm-chan.org/works/lchk/report.html
Yes, made the inductance bigger I could lower the frequency. In my application it's not too important because I just want it to operate at a fixed duty cycle rather than being controllable, and I can get that from a single 555. Interestingly, the circuit works better with a straight 555 rather than the cmos one. But inductors..arrrghhh…! hehe All I know is that the powdered iron is normally used in suppression chokes where as the ferrite is used in transformers…usually.