Here is some real world data, the bottom graph is battery voltage, this is a car without an alternator and two batteries, return style fuel regulator, mallory 250 fuel pump, MSD 7al, Mega 85 Delay box, RPM datalogger running, ACD controlled CO2 shifter, Moroso electric water pump drive, dash and tail lights(LED), and a Shogun LED dial board on. I charge every round. FYI, just data. Open attachement and view full screen to best view.