Tronbike Meter (TBM) 4.0.0 Test Ride

Tuesday, May 10, 2011

Solar Powered Tronbike

With an 800 watt inverter, 100 watt solar panel and 35 Ah battery, I am charging
Tronbike 1.x using the sun!

The battery and charge controller,  the inverter with Kill-A-Watt, Arduino temp and voltage tracker, DC batt charger, yellow cable to Tronbike...

...yellow cable to black cable to Tronbike...


Now, it IS a bit feeble - the bike is using about 150 Wh/mile. Its about 3 miles
to work and back, 3 x 150 Wh = 450 Wh.

The 35Ah battery at 12 volts = 420 Whr, thats all it can store. Assuming we can get 80% efficiency going through the inverters and chargers, maybe 340 WHr
available at night out of the battery after a day of riding.

Pulling about 100watts, the chargers will wipe the battery in under 3 hours - the voltage should drop enough to cut out the inverter before this.

WHERE it gets interesting is when the bike is inside for the day and charging. The 100watt panel can fill the panel in 4 hours of good daylight, not hard to do so far. I'm hoping the bike can act as a sink for any extra solar power. Then to make the bike an effective "sink", I need to regularly use the bike and/or use power from
the bike as it sits! So another inverter off the bike DC-DC converter (50 watt, its small!) could be used to maybe drive LED lights or laptop, etc.

It gets complicated - the possibility of wires and electric energy conversions, it becomes clear why/where grid tie systems are popular. Managing the energy flow from batteries to where the power can be used is a mess.

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