Just to put my two cents in...
I use 4 batteries. I connect 2 together, with a double pole, double throw switch; this allows me to switch them from serial to parallel. At this point I have 2 battery banks (each bank has two 12v batteries). The switch output is either 24v or 12v, dependent on position. For this first switch, I used a 4 pole (double throw) 60A switch instead of two double pole, double throw switches. Either way works, but I use the single switch since I don't need 36v and one switch is just easier.
I then take the outputs (12v or 24v dependent on switch position) and run them to a second double pole, double throw switch (also 60A). The output is either serial to parallel, dependent on switch positions.
With this configuration the Switch options are...
All set to parallel - 12v, 60 x 12 = 720 watts ( this is the default setting I use for charging and general living )
First Switch set to serial, second parallel - 24v, 60 x 24 = 1440 watts ( this I use for low speed cruising )
First and Second switch set to serial - 48v, 60 x 48 = 2880 watts ( this I use for normal cruising )
The second switch is the current limiter; since upstream from it, the current is split in half.
100A and 125A switches are also available (total power = 125A x 48V = 6000watts.
Anybody else do this?
It works well for me.
Ken
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