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#101
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Test results LiFePO4 glider batteries after 6 years
On 08/08/2018 11:30 PM, 2G wrote:
"the only instrument in your panel that might draw a bit less current is a transponder" I seriously doubt it. All modern avionics are designed to operate over a wide input voltage range; they have internal dc-dc conversion circuits that transform the supply voltage to a regulated, operating voltage. Trig, for instance, specifies an input voltage of 11 to 33 V. Tom So does an LX9000 count as a piece of modern avionics? 12 volts nominal, 10-16 volts min to max. How about a Becker 4201 radio? 12.4 min, 15.1 max, 13.8 nominal. There's very little avionics used in gliders that have dc-dc converters, they're included in transponders because you can't generate 300 watt pulses using battery voltage, you have to step it up with a converter. Dave |
#102
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Test results LiFePO4 glider batteries after 6 years
The only one I could find specifically designed for aircraft is the MGL BAT-1 (anything else was only a voltmeter or ammeter):
http://www.mglavionics.com/BAT1.pdf It does not have a coulometer, however. I have specified this for my new ASH31. Tom |
#103
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Test results LiFePO4 glider batteries after 6 years
2G wrote on 8/9/2018 9:10 AM:
The only one I could find specifically designed for aircraft is the MGL BAT-1 (anything else was only a voltmeter or ammeter): http://www.mglavionics.com/BAT1.pdf It does not have a coulometer, however. I have specified this for my new ASH31. Pilots that are don't require the alarm function can find small panel mounted volt-amp meters like these from Amazon for about $15: - WATERWICH DC12-24V/0.1-10A Dual LED Digital Multimeter Amp Voltage Meter - TOOGOO(R)Dual LED Digital Voltmeter Ammeter DC 0-100V 10A Panel Amp Volt Meter I'm not suggesting those two are the best choices, but I have used similar units that worked well. There are panel mounted units that include amp-hour/watt-hour readings, but are larger. I use a charger for my instrument battery that shows amp-hour/watt-hour readings during charge, so I can see the battery did accept the expected charge. That's be satisfactory for years, so I haven't felt the need for amp-hour readings in the glider; generally, my current drain in-flight varies only a little. -- Eric Greenwell - Washington State, USA |
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