I am sure that you can not supply 50A from one 12V, 50A/h accumulators, for 1 hour. Yes, starter motor comsumes hundreds Amps, but for seconds, maybe minutes. :)
I looking for Tektronix 336A Oscilloscope Service Manuals. I have a Tektronix 2215A service manuals. Can you help me friends. Thanks in advance. Best regards: Taner
for 500W output power you must supply 600W (85% efficiency) from accumulator, that mean I=600/12=50A, this is impossible current from one car accumulator. For 500W output power you must connect 2 accumulators, series or parrallel.