I'm a college student diving into a cool electronics project where I want to create a cooler powered by my bike. My plan is to use a dynamo generator to charge batteries that will then power three Peltier modules along with a heat sink and a 12V brushless fan. I'm also looking to include an on/off switch for convenience. I've got some Peltier modules ready to go and they worked fine with batteries when I tested them. I even took apart an Ikea Fixa drill to use its batteries and charging circuit, plus I ordered a 12V 6W dynamo to get things rolling. While I'm pretty handy, I'm feeling a bit stuck on how to put it all together. I'd really appreciate any advice on the parts I need and how to assemble everything! Thanks for any help!
2 Answers
If you're tackling this project, keep in mind that commercial coolers usually need about 4 amps at 12 volts to work efficiently. So, your dynamo's 6W output might fall short of what you need for effective cooling. Just a heads up!
Yeah, it’s important to remember that all the power drawn from a generator creates mechanical resistance. So, be prepared for that if you aim for higher power outputs.
First off, it's crucial to understand that Peltier devices aren't super efficient; 6W is quite low. My advice would be to connect your Peltier cooler to a 12V power source to see how much current it actually pulls while cooling with the fan running. After that, check if your 6W dynamo can reasonably charge the battery you plan to use. Learning about power management is key here!
Totally agree! It takes around 50W to keep even a small fridge cool with a Peltier module, and if you draw too much power from that dynamo, your bike might struggle to keep moving.