Gene,
I did the test but only for 30 minutes. At 30 minutes I had the answer I needed. This is from my previous post;
In a previous test I did on the Parralax 7300, it was putting 11 amps into the batteries at 12.2 volts after 30 minutes. (It started at 30 amps and quickly dropped before it lined out at 11.0). That means that it would take 9 hours to replace the amps withdrawn from the batteries and that was without any other 12 volt loads. I also read the Parralax FAQ and it had pretty much stated that I would get the results that I did but indicated that the design recharge rate and methodology was to protect everything else connected on the 12 volt system. I say that's baloney, it's just a cheap charger.