Ya'll gimme a little peer review here...
Subject is providing backup power to a GRT Sport EFIS and a GRT EIS using the GRT backup battery.
The battery install sheet suggests a "backup battery bus master switch" on the battery output. Such a scheme would require (a) switching after main power failure and waiting for the EFIS to reboot, or (b) engaging the backup bus switch as part of the post-start proceedure. I'm thinking a DPDT avionics master switch would provide uninterupted power via the two isolated EFIS power inputs and eliminate the extra switch operation. Thoughts?
Uninterupted power to the EIS is not so simple as it only has one power input. Can't just hook two power sources to the single input, as a ground short on one would kill both. I'm thinking a pair of diodes as shown would do the job. Any downside? Any special diode required? Other methods? Did you even bother with backup power for the EIS (don't need it to fly)?
Subject is providing backup power to a GRT Sport EFIS and a GRT EIS using the GRT backup battery.
The battery install sheet suggests a "backup battery bus master switch" on the battery output. Such a scheme would require (a) switching after main power failure and waiting for the EFIS to reboot, or (b) engaging the backup bus switch as part of the post-start proceedure. I'm thinking a DPDT avionics master switch would provide uninterupted power via the two isolated EFIS power inputs and eliminate the extra switch operation. Thoughts?
Uninterupted power to the EIS is not so simple as it only has one power input. Can't just hook two power sources to the single input, as a ground short on one would kill both. I'm thinking a pair of diodes as shown would do the job. Any downside? Any special diode required? Other methods? Did you even bother with backup power for the EIS (don't need it to fly)?