DC to DC converter and 12V Car Battery Maintainer

Vote up!
Vote down!

Points: 1

You voted ‘up’

Use the input from a solar panel to maintain a car battery. Also provide 5V out from battery to power an arduino at night
Status: 
Design Fufilled

Comments

5
Shane Oberloier's picture

It is possible to do this with parts from the UPL, but I think things will be more strait forward using this: http://www.ti.com/lit/ds/symlink/lm723.pdf This may be next on my to-do list.
Shane Oberloier's picture

When making a voltage converter it's important to consider power efficiency. I've made this page: http://opencircuitinstitute.org/content/low-drop-out-regulators-vs-buck-converters To talk about the two key circuits that can be used for this. Common voltages out of a solar panel are 17V. Do you know how much your system will output, or are you just looking for a general circuit?

very nice! yup, ive got a solar panel that puts out about 17ish if i remeber correctly. Heres a link i found about the best practices for tweaking the voltage and amps http://batteryuniversity.com/learn/article/charging_the_lead_acid_battery does that sound right? would it make since to use an arduino compatible chip to monitor the voltage over longer time frames? seems like lead acid batteries need a "top up" every so often?

or maybe just a float charge is enough? im not real familiar. https://en.wikipedia.org/wiki/Float_voltage
Shane Oberloier's picture

Hi Dorkmo, I've created your design: http://opencircuitinstitute.org/content/solar-battery-charger . Please check it out at let me know if this is the kind of thing you're looking for. If this is - please edit your request status to "Fufilled". If you'd like to fabricate this board - please let me know and I can recommend the next steps. Unfortunately I do not have the funds to create this board right now. If you're happy with this design please tell you friends about it and OCI in general. Thanks for your request!