On Jul 23, 4:51*am, joesimmers wrote:
I recently built a small fan system to dry my wing tanks.

Even after the fan stops rotating it will still be drawing current and
the battery voltage can be expected to go to zero.

Simplest solution may be a timer. I think others have used solar
panels to power the dryer fan. If I was doing it I'd probably cobble
up a self latching relay. When the voltage drops low enough for the
relay to unlatch there is no battery load. You can tailor the drop
out voltage by selection of relay type and tweak it with a resistor in
series with the coil.


Andy