Quote:
Originally Posted by Old Tele man
A 12Vdc drop-in for "model" airplane or "real" passenger-carrying airplane?
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Do a Google search for N19WT.
Quote:
Originally Posted by Old Tele man
Schottky diode voltage drop is ~ 0.3Vdc, is that acceptable? Either a contact relay or FET would be much lower, but relay is vibration prone. . .
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The Schottky is just to prevent reverse flow from the battery through the solar array. In the dark, the ones I've tested have a small but significant current flow. But in bright sunlight, the 12V panel I tested easily generated over 20V.
I would prefer to use a buck regulator so when the solar panel generated excess power, we could get a closer match to the battery load. But we are talking about 1.5W. For now, KISS makes more sense and if I need more power, adding a second panel is cheap. But let me get some metrics, first.
For the battery isolation, I'm open to a suggested part:
- 30-60A - bidirectional
- default OFF - an asserted gate is needed to go to a conductive state
- minimum voltage drop
But this is an option to look at with some operational metrics. Disconnecting the 12V NiMH battery wipes out the ECU memory and there is significant in-rush.
The primary issue is the solar panel generating enough power in daylight to handle the 24 hour, parasitic load.
Bob Wilson