Need help with a basic overvoltage protection module or system. I have an RV7 with about 300 hours, a two screen G3X non touch and a G5, wiring harness prepared by Stein Air. Basic circuit breakers together with a 24 place fuse panel with 12 places assigned for avionics buss and 12 for sub fuse block buss. I have a alternator field CB and an Alternator field switch. The switch will cut/turn off the alternator to the main buss. I have installed an emergency battery LiFePO4 which is connected via a switch to back feed the avionics buss. I will attempt to attach a copy of my wiring diagram, photo of emergency battery and fuse panel for your review. I have replaced the Narco and indicator with a Garmin SL30 which is wired by RS232 direct to G5 rather than going through the can buss.
I have had very poor luck with PC680 odyssey batteries and have just replaced my last one with a Shorai LFX18A1-BS12. I have monitored the charging system closely since this replacement and have noted that after starting, the voltage may read on the G3X up to 14.6 or 7 and amps +3 or 4 for a very short period. I leave it at engine idle for several minutes before moving and the voltage drops to 14.4 and amps to +1 or 2. After a very short period the voltage will read 14.4 and amps will be at 0. Is that normal?
I have never had voltage above 14.8 with a dying odyssey or amps over +4. After reading many post when researching the Shorai battery there were concerns about a malfunctioning alternator, I have thought that it would be prudent to install an over voltage system to protect my avionics and the Shorai LiFePO4 battery and an under voltage protection for the battery. My emergency battery is not connected to be recharged by the alternator and I use it strictly as an emergency power source for my avionics. I charge it outside of my aircraft with a special charger (CTEK) and it will power up to 10 amps for over an hour (at least that what my bench test confirmed).
I have reviewed the Perhelion Design OV module and it may be sufficient wired per his diagram in between my alt fld switch. I have also purchased a relay module from Amazon VR1000 Single Phase Protection Relay Over-Voltage 9V-18V Under-Voltage 0.1V-6V AC/DC(D12)
by YWBL-WH but I do not think it will work.
If you have a simple wiring diagram or modules that I can plug and play, please post. I have attached a couple of pdf photos and a woiring diagram but I am not sure that I did it right. ThanksView attachment Electrical Schematic - Rev. 4.pdf
View attachment emergency LifePo4 bat.pdf
View attachment fuse panel with lighted fuses.pdf
I have had very poor luck with PC680 odyssey batteries and have just replaced my last one with a Shorai LFX18A1-BS12. I have monitored the charging system closely since this replacement and have noted that after starting, the voltage may read on the G3X up to 14.6 or 7 and amps +3 or 4 for a very short period. I leave it at engine idle for several minutes before moving and the voltage drops to 14.4 and amps to +1 or 2. After a very short period the voltage will read 14.4 and amps will be at 0. Is that normal?
I have never had voltage above 14.8 with a dying odyssey or amps over +4. After reading many post when researching the Shorai battery there were concerns about a malfunctioning alternator, I have thought that it would be prudent to install an over voltage system to protect my avionics and the Shorai LiFePO4 battery and an under voltage protection for the battery. My emergency battery is not connected to be recharged by the alternator and I use it strictly as an emergency power source for my avionics. I charge it outside of my aircraft with a special charger (CTEK) and it will power up to 10 amps for over an hour (at least that what my bench test confirmed).
I have reviewed the Perhelion Design OV module and it may be sufficient wired per his diagram in between my alt fld switch. I have also purchased a relay module from Amazon VR1000 Single Phase Protection Relay Over-Voltage 9V-18V Under-Voltage 0.1V-6V AC/DC(D12)
by YWBL-WH but I do not think it will work.
If you have a simple wiring diagram or modules that I can plug and play, please post. I have attached a couple of pdf photos and a woiring diagram but I am not sure that I did it right. ThanksView attachment Electrical Schematic - Rev. 4.pdf
View attachment emergency LifePo4 bat.pdf
View attachment fuse panel with lighted fuses.pdf