jluckey(at)pacbell.net
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 Posted: Mon Feb 02, 2015 10:36 am Post subject: Electrical System with Dual Batteries & Brownout Prevent |
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"Good workmanship will prevent short circuits."
Yeah, good workmanship is definitely a requirement but it is not enough. Over-current protection devices: fuses, circuit breakers, current limiters, prevent melting stuff and fires (that's why they were created). All the Good Workmanship in the world cannot foresee every possible bad event.
We just had a case-in-point on the VansAirforce forum. Bad stuff happens no matter how diligent we are in trying to prevent it - Murphy's Law. It seems irresponsible of us as system designers to ignore that fact, especially when circuit protection devices are so cheap, easy, and simple.
-Jeff
On Thursday, January 29, 2015 7:02 PM, user9253 <fransew(at)gmail.com> wrote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>Attached is a diagram that I drew of an electrical system with two engine-cranking batteries and brownout prevention. It is intended for a seaplane that will fly into remote lakes. Either battery can crank the engine. One of the batteries will run a bilge pump. If the engine is cranked using only one battery, then the other battery will provide 12 volts to avionics to prevent brownout. The electrically dependent engine will be powered by the same bus as the avionics. With multiple current paths through two contactors and two relays, the chances of this bus losing power are slim. Good workmanship will prevent short circuits. Go ahead and point out any faults with this diagram or give suggestions. You will not hurt my feelings. I want to fix any shortcomings or design errors. I used Bob N's Z-19/RB as a staring point, although you might not see any resemblance.Joe--------Joe GoresRead this topic online here:http://forums.matronics.com/viewtopic.php?p=437846#437846Attachments:
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