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Hi I would like to know what the optimum configuration would be for both 6 and 8 batteries would be for a solar 12 v battery bank. The batteries are all 12 volt and 75 Amp hour each and the output should be 12 volt. Below is the setup from your site indicating how to wire 4 batteries. Also what size wires should I use for this setup and where should I place the fuses and what size is optimal Also using your method 4 could you please provide me with a wiring diagram for the above mentioned 12 volt batteries that are 75 ah each.. Also what gauge should the wires be for joining them. Should there be a fuse in the system? this would hook up to a 1500W inverter and I asssume that I should have an fuse both before and after the batteries. The Solar panel is 480 watts at 24 V. The Charge Controller converts this to 12 volts so it would produce 40 amps as a max when it reduces it to 12 volts. So, thanks to a colleague, we can also present another wiring method that achieves perfect battery balancing............... Method 4 And here it is. This looks odd but it's actually quite simple. What has been done here is to start with 2 pairs of batteries. Each wired in the proper "cross diagonal" method. Then each pair is wired together, again in the cross diagonal method. Notice that for each individual battery, the current always goes through a total of one long link and one short link before reaching the loads. This method also achieves perfect balance between all 4 batteries and may be easier to wire up in some installations. Many thanks to "smileypete" from www.canalworld.net/forums for this idea.