well gerd.   for starters the portable charger circuit is designed to re-charge the installed 6v AGM/SLA battery only. And the circuit was only designed for 1500ma or 1.5a(MAX).  It was not designed, or was ever intended to run the system.   Also the System was not designed to run with out a battery. The system needs that 6.8v battery to be installed... if you want more information why... you can do some searches, all this information has been beat up before across many threads on this forum.