I have my Raspi 3B powered by the standard adapter and it works ok. Supply voltage is 5,2V.
Now i use fully loaded car battery (13,2V and 110Ah) regulated by a 3A 5V 3-pin regulator (LM1084) that provides 5,05V.
Now the Raspi boots, starts normally but after some (20secs) it reboots and keeps doing that ad infinitum.
I looked at the power line on the scope but no strange phenomenon visible.
Does anybody has a clue as to the possibe cause of this problem?
Has anybody seen this before?
I can't imagine that it is the voltage being slightly lower than that from the adapter