What is the basic setup?
Solar Panel Charges Battery -> Battery Stores and
Supplies Power -> Arduino
We like our 2, 3.4 and 6 Watt Kits for these applications.
The V15 and V39 batteries charge efficiently from solar and have an
"Always On" mode which keeps them on whether or not a device is
drawing any power. We have more information on sizing your system below.
2 Watt Kit $65 3.4
Watt Solar Kit $75 6 Watt Solar
Kit $89
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How long will a given battery run the Arduino for?
It depends on what mode the Arduino is in and what
peripherals you have running. There are lots of forums that discuss how to put
the Arduino in sleep mode so that it consumes 5mA or less. We use this as the
low case, 25mA as the "running-code" case, and 300mA as constantly
running peripherals case. If you're looking to run an Arduino offgrid, you will
be able to run it longer with a smaller battery and panel if you can put the
device in sleep mode as much as possible.
The other factor is the power consumption of the batteries.
We're working on it, but for now our V15 and V39 consume about 1 Watt hour of
power a day in Always On mode.
Arduino Runtime from V15, V39 Batteries
Current (mA) Power
Consumption (Watts) Power Consumption per
Day (Watt Hours) Days Runtime V15 Days Runtime V39
Arduino - Sleep 5 .025 0.6 9.4 24.4
Arduino - Normal 25 .125 3 3.8 9.8
Arduino - High Power 300 1.5 36 0.4 1.1
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How big a solar panel do I need?
Here is approximately how much power you can expect to
generate in reasonably good sun over 5 hours in a day. As a rule of thumb, we
estimate power generation by multiplying Watts times hours and divided by loss
factor of 2 (W*h/2). To determine panel sizing estimate how much power your
system will consume and adjust for conditions. Clear and sunny with no shade
cover requires less panel than if you're in Seattle in the winter. When in
doubt, get the bigger panel and battery.
Power Production into Battery per Day
Assumes 5 hours of good sun a day
Panel Size Watt
Hours per Day
2 Watts 5
3.4 Watts 8.5
6 Watts 15
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If the Voltaic battery runs out of power, then what happens?
If the V15 or V39 run out of power while in Always On mode,
your Arduino will obviously stop working. Once the batteries build up a bit up
a buffer of power from solar (normally about 20 minutes), the battery will
power up and restart your Arduino.
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Voltaic Arduino Bounty!? What's that?
This is a running list of projects we would like to see
implemented with solar and Arduinos. If you're the first person to document
(blog or instructable with photos) a working project on our bounty list, we'll
refund your purchase prices of panels and batteries up to $150. The project
should be able to run for weeks or months at a time without interruption from
humans. If you have another favorite platform other than Arduino, we're open to
alternatives. Here's the list:
Surf Cam Broadcast to Web
Bellagio-style Water Show
Motion Activated Wildlife Camera
Motion Activated Security Camera
Air Pollution Monitor with Broadcast to Web
LED Space Invaders Street Art
- See more at:
http://www.voltaicsystems.com/solar-arduino-guide.shtml#sthash.RlhaDY8F.dpuf
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