Scott Hersha
Well Known Member
I have a question or two about the simple wiring diagram I’m working on for my RV6 build. This is going to be a simple VFR panel with a GRT Horizon 10.1, a GTR200B radio, Sandia remote transponder, 2-axis GRT autopilot. B&C 40a alternator, PC680 main battery, 5 ah SLA backup battery.
My question has to do with the use of relays, and whether or not I need a couple of them. Diagram below. There is a switched bus tie relay(BTR) that feeds secondary power to the Aux bus that will also charge the Aux battery. There is another switched relay for the Aux battery feed to the Aux bus. These wires will probably carry no more than 5 amps when charging the Aux battery, and less than 3 amps when not charging. Can I just use a toggle switch for these two runs and eliminate those two relays? There is about an 85 ohm resistance through these relays and Aux battery charging will be affected. The switches are Carling switches from Stein, and are rated for 10a @ 250 VAC, 15a @ 125 VAC. How does this translated to 14 v-dc?
I plan on keeping the avionics bus relay. The drawing is crude, and I’ll probably be adding a couple things I haven’t thought of. The main battery is forward of the firewall, Aux battery aft of FW. Main bus feed through firewall is protected by a 50a maxi fuse, and the alternator B lead wire is protected by an ANL current limiter. In the event of an alternator failure, I’ll simply open the Aux bus switch, and the SureFly will be the only thing running on the Aux battery.
Comments?
My question has to do with the use of relays, and whether or not I need a couple of them. Diagram below. There is a switched bus tie relay(BTR) that feeds secondary power to the Aux bus that will also charge the Aux battery. There is another switched relay for the Aux battery feed to the Aux bus. These wires will probably carry no more than 5 amps when charging the Aux battery, and less than 3 amps when not charging. Can I just use a toggle switch for these two runs and eliminate those two relays? There is about an 85 ohm resistance through these relays and Aux battery charging will be affected. The switches are Carling switches from Stein, and are rated for 10a @ 250 VAC, 15a @ 125 VAC. How does this translated to 14 v-dc?
I plan on keeping the avionics bus relay. The drawing is crude, and I’ll probably be adding a couple things I haven’t thought of. The main battery is forward of the firewall, Aux battery aft of FW. Main bus feed through firewall is protected by a 50a maxi fuse, and the alternator B lead wire is protected by an ANL current limiter. In the event of an alternator failure, I’ll simply open the Aux bus switch, and the SureFly will be the only thing running on the Aux battery.
Comments?