|
|
Sky2high@aol.com wrote:
In a message dated 12/3/2005 10:11:50 P.M. Central Standard Time, marv@lancaironline.net writes:
To answer your question, I think the back-up battery is suffiecently
charged
through the diode. John,
As usual, Experimental airplanes are interesting in the different schemes used to meet different objectives.
What is the voltage you measure at aux V as the secondary battery charging level?
My "Aux" battery settles out at 14.2 Volts (.3 Volts below the Main, measured with the same voltmeter). I am assuming that 14.2 will be good enough for a reasonable charge.
Since I can switch off the charging current, I can test this battery while on a cross country by running it for an hour or so and watching the voltage on the battery. Then I can recharge it before landing.
What I am looking for is a Battery-Tender like device to slow charge and maintain a STANDBY battery at the appropriate float voltage and that operates from a 12-14 VDC power supply rather than 120 VAC. This would properly keep such a standby battery ready for use when needed.
The two ways you can do this are
a.) Have a second alternator with second regulator
b.) Have a switching power supply that will run off a 12-14 volts input, that has a micro controlled battery charge function like
http://www.batterymart.com/battery.mv?c=12vbatterydefender
except that it runs off a 12V dc input. It can be done, but I don't know of any on the market.
Scott Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)
Merry Christmas to all!
Have fun! John
|
|