On Saturday, November 26, 2016 at 5:27:24 PM UTC-8, wrote:
On Saturday, November 26, 2016 at 6:47:29 PM UTC-5, AS wrote:
(and lithiums are not an option)

Tom

Why might that be? Just curious ....

Uli
AS

4-6 volt batts ( 20 ampH), wired so that they supply both the engine and the avionics. Toggle switch chooses either just avionics, or both motor and avionics.

Unique wiring situation, I have studied the wiring diagram, and wiring in the plane and not figured out a safe way to wire in batteries to just the avionic side so that there would be no possibility of drawing high current also for motor start. This would fry normal avionic sized wires.

Ideally, it would be wired so you could feed the avionics from lithiums, and then have the ability to save the main batteries for motor start, but also use them as back up for avionics if the need occurred.

If anyone has come up with a good and safe solution please email me.

Kevin
92
Kevin Soar AT Gmail dot com

Kevin,

One would think it would be doable using a diode isolator (Schottky diode for low forward loss) - insert diode ahead of the avionics buss on current wiring set up. Then simply wire the new aux battery to the buss side of the diode. No back feed from the AUX to the system.

No help for the DG, but this one works well as a replacement for the 12V 18AH in ships like the ASH26E, as it can provide enough current for the starter and is a direct replacement. http://www.batterypete.com/batteries...ab-description