Kayak Batteries for sale

[alanw]

Originally Posted by Fomen

Here is a picture of the voltage step down device I made. It's a pretty simple electrolytic component. It's basically a couple of resistors in series. Then I encapsulate it in a 2 part casting resin. It's impervious to water. The battery I have it hooked up to is 12.9 VDC. The output of the component is 6.6 VDC.

Sounds like a simple voltage divider. If it is, it's very inefficient and shouldn't be used as a power supply for a load. Every bit of current used by the pump also has to run through a resistor, and all that wasted power is dissipated as heat.

[Fomen]

Originally Posted by alanw

Sounds like a simple voltage divider. If it is, it's very inefficient and shouldn't be used as a power supply for a load. Every bit of current used by the pump also has to run through a resistor, and all that wasted power is dissipated as heat.

It depends on the size of the resistors (actual size, not ohms rating). I used large 500 ohm resistors. But, just to be sure I'll run a load on it. I have a infrared Lazer gun. I'll shoot the temp at the start and every 30 minutes for a couple of hours. Heat is always a byproduct of energy, so I wont be surprised if it heats up a little bit. We'll see what the result is.