Looks like everyone is spread all across the board on which is better haha...
#1 is best bet for not doing harm to anything. It just may take a bit longer if you are wanting to get from 50% charge to 90% charge in a quick three hour time frame...
What you don't want to happen is over charge the batteries and boil out fluids. We all know the 13.6VDC setting will boil out fluids if continuous for long periods of time.
The smart mode chargers solve this problem by not staying in any one continuous mode for long periods of time. Jumps around between 13.2-13.6 and 14.4VDC with my PD9260C settings and out of habit I always check my fluids and never see any problems since getting the smart mode charger..
I'm kinda glad my PD9260C only goes to 14.4VDC for equalization. This happens every 19 hours for about 15 minutes. The 15.1/.3VDC might be a tad high for some of your 12VDC items in your trailer...
Roy ken
