With some inspiration from the potential snow storm last week, I endeavored to test my emergency preparedness for heating my apartment when the power is out. I never did lose power, but the test was successful and I am happy to know that if I did lose power in the winter, I can keep warm at home.
I attached an inverter to a marine battery, then plugged in my Rinnai heater and it ran just fine. The Rinnai does buzz a bit loudly, but that’s because the inverter does not produce a “true-sine-wave” signal. I tested the setup with a box-fan attached to the inverter as well and it worked fine.
With the fan and the heater both running on LOW the draw was 115W. Some quick and super dirty math approximations tell me that the battery (if fully charged) will run this about 11 hours. This would be longer if the box-fan isn’t running (less power would be used).
105 Amp hours (sticker value, full charge)
105 Amp hours x 12v = 1260 watt hours (approximate average voltage)
1260 watt hours / 115 watts = ~11 hours
Of course, the inverter can be run from any 12V source. My Honda Civic has an alternator with a faceplate rating of 70Amps. Some quick math tells me how much power this can potentially provide.
70 Amps x 12 Vdc = 840 Wattsdc
I believe the inverter is well within the ability for the alternator to run. So the car could potentially run the inverter as a generator as long as there is gasoline in the tank.
Check out the rest of the info and pictures at my blog.
Laboratory B is all set up and ready to see you at Champlain Mini Maker Faire this weekend! The event is on Sat. October 4th 10am – 5pm, and Sun. October 5th 11am-4pm at Shelburne Farms in Shelburne Vermont.
“Join the folks at Laboratory B for a self-paced soldering workshop. We bring the soldering irons and the kits, you bring the desire to learn. We will have kits from SparkFun and all the required supplies and safety gear for you to sit down and learn how to solder, and when you finish you take the kit home! Have you soldered in the past but are not familiar with some of the newer techniques such as surface-mount soldering? No problem! There will be beginner kits, intermediate kits, and advanced level kits to fit all skill levels.”
The Laboratory B crew had a great time at Champlain Valley Maker Faire. It was a gleeful marathon of teaching kids & adults to solder using the Sparkfun kits. Labortory B would like to thank in short order.
Jeff B & the rest of the SparkFun Crew
Jerome, Doug Andrea, John and all the other organizers of the Faire
All the kids & adults who spent some time with us learning to solder. See people’s expressions when they finished their kits was priceless!
To all the folks that stopped by the soldering station and wanted to come by the Lab; Open hours are 5:00 pm to 8 pm Tuesday and Thursday. Email [email protected] or call us at 802.540.2524. We would love to meet with you where it is warm & dry.
Finally: It’s the first of the month, so that means it’s 2600 time on Friday! Meeting will be at the usual place the Game Lounge at 178 Main Street in Burlington Vermont from 5-8. It’s on the third floor, so just keep going up. There will be signs to point the way.
Laboratory B will have a booth at the Champlain Valley Maker Faire, the Faire is Saturday September 29th from 10-7 at the Coach Barn at Shelburne Farms. At the booth we’ll teach young and old how to solder! We’ll have someawesomekits from SparkFun. You should buy tickets now to make sure you can get into the Faire.
Do you think having a Maker Faire in Vermont is cool! If so print out some posters and join the street team! Let people know!