Hi, There are a few things to consider when wiring a series/parallel battery bank. The first is safety. It may come to pass that one of the batteries might develop a shorted cell. In that case HUGE amounts of current would try to flow from the non-shorted batteries into the shorted one. The second is charging equality. This means getting all the batteries an equal share of the charging, and discharging currents. Thus I have a few suggestions for setting up such a system. First ALL cables, regardless of length, need to be as BIG as you can make them. Until you can't bend them to make connections there is simply no such thing as too thick a cable. Second each series pair (12 volt combined voltage) needs to be fused. This fuse needs to be selected to allow any two of the three pairs to provide all the current needed in the installation. Third the cables from each series pair to the fuse, then on to the main junction (not the distribution panel, a local point where the batteries are all connected together) need to be the same length, regardless of the distance to each series pair. This holds true for both the positive cables AND the negative (ground) cables. Both the cables to the charger and to the distribution panel also need to be connected to these junction points. If your charging system has remote voltage sensing wires (please tell me it does?) these wires should be connected to the ground (negative) battery post of the battery at one end (physical location) of the battery bank, the positive sense wire should be connected to the positive post of the battery at the other end (physical location) of the battery bank. Now that you have the negative battery posts all connected at one point you can connect your battery monitor's shunt to that point and then from the other end of the shunt to your boat's ground system. Now you have wired your battery bank in such a way as to allow for even charging, even power usage, and the best chance of a long life for each battery in the system. Don't forget, charge your batteries often and completely. The deeper you discharge a battery bank before recharging the sooner that battery bank will die. The more times you fail to charge to 100% the faster sulfating will occur and the sooner the battery bank will die. Use smart chargers. Set them up correctly. Use temperature sensors with that charging system to compensate the charging voltages. Again. There is NO SUCH THING as too thick a battery cable! Eric Thompson S/V Procrastinator South San Francisco capteric36@sbcglobal.net