Iâm hoping someone could give me a hand with jerry rigging a DIY trolling motor battery for a small boat (not a toy, but made out of many many water bottles, pvc, etc.) that will not get too much use.
I need it to be very inexpensive and reasonably light. 10 D cells in a PVC pipe would be great. 20 would not be too bad.
I am pretty much electrically illiterate. Here is what I have so far.
I have an immersion blender â¦ one of those things that Emeril Lagasse calls âboat motorsâ. I can attach a drive shaft and propeller to it. Because it is designed for being in liquids with more resistance than water (though with a smaller prop/blade), I think it will have sufficient torque to get some push. I will not know if it is enough until I give it a try, but I do know that weed wackers can be so converted and I donât think they have much torque.
The part I am stuck on is hooking it up to batteries. It is a 120V plug in device.
I have a small 75 Watt inverter. I can plug the blender into the inverter and that into a car lighter and it runs well. I have hope! I understand that I should have 120 Watt inverter, but 75 is what I have.
I have an accessory car lighter outlet to plug the inverter into. It has a red line with a fuse box mid way and a black line, identified as a ground line with a loop at the end. The directions say to screw that loop into the frame of a car and connect the red to the hot battery line. But as I am not using a car that is not of much help.
I tried stringing 10 AA batteries together end to end, temporarily held snug with duct tape, and connect it to the inverter with the accessory lighter plug outlet, but I did not have any luck. The motor did not spin and the inverter power light did not come on. I used electrical tape to connect the red to the positive end of the string and tried taping the black to the negative and also to a knife to ground.
I tried AA as I know those will get used one way or another. I did not want to invest in Dâs until knew it would work. As I understand it, Dâs will last longer. (I am not interested in re-charging).
Since then, I came across a few bits of info on another site. One thread mentioned using a spring from, say a flash light, at the negative end and a bolt at the other. Another said that PVC was great for grounding.
Some useful bits of info are that in addition to the 120V, the motor runs at 1.0 Amps. I do not know if the 60 hertz is relevant.
Does any one have any ideas about how to do something this?
Do I just need to replace the fuse and try again with Dâs?
How do I connect the lines? Wrap the red around a bolt through a capped pvc tube and tape the ground to the side of the tube, with a spring in the other capped end touching the negative end? Do I need two 10 series in parallel? I can stack batteries end to end, but how do I connect parallels, especially without soldering?
I do not want to use a 12 volt car or marine battery. This motor is not going to get enough use to justify the cost of such a battery and charger and I do not what to deal with the weight.
If I can get 10-15 minutes of power from a stack of D-cells (hopefully more time), I would call that a success as this is a learning experience as much as anything. An hour would be much better.
Thanks in advance for any help.