On Feb 4, 6:28*pm, Papa3 wrote:
According to the Becker manual, the 4201 Low Voltage warning (blinking of the display) kicks in when the supply voltage drops to 10.5. * I'm wondering if anyone has had a reason to independently check this out for accuracy. *Reason for the question is that my Becker seems to be indicating low voltage before it "should".

*I run two 12V 12AH SLA batteries (independent circuits) which I just load tested (thanks to the John DeRosa article in soaring). *The newer battery shows almost new performance (6.5 hours to terminal voltage under a 1.7A load). * The older one shows nearly 70%.

The average load in my glider is about 1.8A (Radio, Xponder, Clearnav and vario assuming 5% transmit and fairly frequent interrogation on the Xponder). * The radio frequently starts blinking after only a couple of hours. * Nobody has complained about the transmit quality. *And yeah, I know the Becker has a built in volt meter. *I just never thought to turn it to that page when this happens.

Any thoughts?

P3

Do you use circuit breakers?

The 2A CB in my panel showed a 0.44 V voltage drop when I keyed the
transmit button on my radio. Fuses (fast blow type) are much lower
resistance than similarly rated CBs.

-Evan Ludeman / T8