nuckolls.bob(at)aeroelect
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 Posted: Thu Dec 10, 2015 8:36 am Post subject: Revisiting Ground Power Adapter: Modern Chargers |
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However, when driving the airframe battery with a modern, computer-
controlled charger, the charge port contactor relay chatters (oscillates
open-closed) at 3-5 Hz. If I modify the Nuckoll's circuit to remove the
kickback diode on the contactor (1N4001), the chatter stops and circuit
performs as expected. I have yet to put a scope on the circuit, but the
12 Henries of reactance I estimated on the White-Rogers Type 71 coil
seems to interact badly with the voltage sensing feature of "Smart" chargers.
May very well be . . . the current bevy of 'smart
chargers' seem to have many and varied minds of their
own. I did some tests on a "carbon foam" SVLA battery
for Beech a few years ago. This 100AH battery would not
charge in a timely manner with any of my 'standard'
chargers. I purchased a new Schumacher charger rated
at 25A. Here's a voltage plot of the charger's output
for recovering from a deep discharge
[img]cid:7.1.0.9.0.20151210102648.07395988(at)aeroelectric.com.0[/img]
Batteries are probably the ultimate integrators of 'rough'
charging profiles but as you've noted, 'foreign' devices
in the circuit may produce unexpected behaviors.
Bob . . .
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