15 Watt Solar Panel- Bilge Pump (No Battery) Shut Off and Turn on Automatically?

It's sort of fail safe I'd think.
If there isn't enough light to power the motor, then there isn't enough light to produce enough current to burn out the motor which has stalled due to low volts either.
If you want to be sure you need to provide the motor and solar panel spe'c and/or take some measurement.
My gut feel says you are ok though as it's all pretty low power and the solar panel is under-rated anyhow.
Del

Dear sir,

I think that your system is OK.

I have used solar panels to power a 1/4 HP water pump, and when there is not enough sunlight the system just shuts off. Between the solar panels and the pump there is a VFD, when the VFD has not enough power to drive the electric motor it stops it.

When there is enough sunlight again the systems restarts.

As you are using a 15 W solar panel, less power no VFD, but the concept is the same, the system will work fine.

Best regards,

Jorge.

I vote for, "a gyrating go go girl".

Sadly and regretfully, LynDoor™ Industries cannot tender a price offer for a gyrating go go girl ornament.

Our head of R&D, Nancy the Welder, has struck out on a private venture. The entire LynDoor™ Industries G⁴ Division has collapsed in her absence.

Does that also kill off the pole dancing "lady"? Based on the findings in post #11, there is an open market for this.

There is, we believe, quite a large unfulfilled market segment of Gyrating Go-Go Girl ornament consumers.

Our G⁴ Division was one of our most profitable segments, grossing nearly $8 USD per quarter, the tertiary market (as we are discussing here) outpacing the secondary market by 3 to 1. A Gyrating Go-Go Girl ornament, being a discretionary luxury purchase item, has essentially no primary market.

Hmmmnm... Pole dancing lady... you may be on to something here. At the next LynDoor™ Industries board meeting (scheduled 29 February, East Undershirt, AK), I will bring this up for discussion and possible action. There may be a little something extra in your pay envelope for this useful suggestion!

It's not going to get any hotter than if it were left on its own out in the sun.

So shooting water into a bucket at an an angle and making it spin constitutes a gravitational vortex now?

No, but it is a decent demo.

Lots of people liked it and lots of people came back for a second and third look.

Capacitors store energy, but release it all at once (ignoring "super caps" that you can't afford yet). If you want this to work when shaded, you need a battery. Batteries cost money, require maintenance and you will need a charging circuit. Hard to imagine a "wire man riding a bike" being worth that much trouble.

But a gyrating go-go girl might be...

If a 25 or 30 watt pump powered by solar could pump 600 gallons per hour, approximately 10 litres per minute, it is quite good.

I would like to access such pump to work on my solar photovoltaic panel of 40 watt/12 V D.C. power

Could you tell me where that bilge pump was procured and its cost ?

I really don't know the specs. It was the lowest end 12 volt bilge pump I could buy. There are hundreds of them on the net but they only pump a couple of ft high.

Thanks for all the comments. I had a look but didn't find a wire gyrating go go girl online. All i found was "kinetic sculptures" http://www.youtube.com/watch?v=8QiOAg_Caig&feature=plcp

It is sort of the same idea as the kinetic sculptures but less trippy. Here is another one. http://www.youtube.com/watch?feature=player_detailpage&v=D2HF-1xjpP8 All these things need a power source and maybe the gravitational vortex can do it. It is really simple and I like how the torque just builds up if not enough power is being used.