SolarDIY

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SolarDIY is a vibrant community dedicated to embracing the power of solar energy. Here, we encourage you to showcase your ingenious ideas, innovative projects, and inspiring stories, while also seeking valuable advice, fresh ideas, and fostering meaningful connections.

Our passion lies in witnessing the remarkable achievements of individuals who have harnessed the potential of solar energy. Whether you have successfully wired your entire house with solar panels, created a portable solar-powered generator, or crafted an efficient solar pool heater, we are eager to learn from your experiences and celebrate your accomplishments.

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pdavis@lemmy.world

Help designing a tiny solar system (lemmy.world)

submitted 11 months ago by MossyHabitat@lemmy.world to c/solardiy@lemmy.world

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For several years I've used a Raspberry Pi Zero for sensors, camera & door motor control which opens & closes a chicken coop door. The Rpi & controller is 5v, the motor is 12v. This has been powered by around 50' of extension cord, but the elements are beginning to weather the cord & we also need to move the chickens further away from our mains. I think it is time to implement solar. I aspire to assemble a PV, battery, & converter system which:

Uses an off-the-shelf 12v PV panel (30w or so)
Uses LiFePO cells for heat resiliency & stability
Provides both 12v & 5v power
Isn't proprietary; uses standard, easily-sourced components... unless it meets specs perfectly & isn't terribly expensive.
Minimal power draw; at most 2 amps @ 12v for 10 seconds twice daily.

Does anyone have suggestions regarding this configuration, know of a post, blog, or video which does something similar, or is willing to ID components you'd recommend for this project?

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[–] walden@sub.wetshaving.social 2 points 11 months ago* (last edited 11 months ago)

I'm around 41°N (southern New England). I installed a Victron SmartSolar 30A just within the past week, so the stats I have are limited. The best I've seen so far was yesterday where I got 50Wh. Most other days it has been 40Wh. Today is a bit cloudy so I'll try and update you on what I get.

Edit: I made a spreadsheet to sort of figure out what I can accomplish with 50Wh -- and it's not much! If the Pi draws 2.5 watts, the solar will only cover 20 hours not including any other electricity I want to use.

This time of year has the shortest days, so if I can bump it to 60+ Wh a day that will be better. My property also has the downside of a hill to the west, so it makes direct sunlight even shorter. I've already ordered a 2nd 100w panel from Harbor Freight so that will help.