What may cause this type of electrical failure
Below is the brief summary of the failure , aircraft type LSA, EV97
Startup: as usual, no evidence of weak battery, actually it was new, 50 hours of use, voltmeter between 12.7 and 13.8 depending on the rpm, charging is normal,
1 hour flight: no traces of any failure, no rough engine, no loss of comm transmission power, all gauges are good
Landing roll: as the throttle went into idle, garmin 430 began blinking and shutdown itself , screens running on backup batteries, gps system failed, transponder failed, voltmeter turned into red and displayed zero value,
Restart attempt. Everything was dead, battery was empty