battery bank/inverter question

 right now the pv array is 1100 watts; battery bank is 12 volts;
i want to add some more pv, but the mx60 inverter is at
its limit now; there is also a sizeable investment in 12 volt
infrastracture: inverters(2), led lighting, load and diversion
controler, refrigerator, other 12 volt lighting.

my question is, can i tap the "12 volt portion" of the battery bank
if it is set up for 24 volts:

12 volt inverter
___________
|         |
|         |
+___- +___- +___- +___-
|6V    6V    6V    6V |
|                     |
-----------------------
24 volts to charge controller

am pretty sure this will work, but am wondering if
there are any potential problems with it.

 

Bad Idea...... you will be overcharging the nontapped two 6Vdc batteries,
in the 24Vdc Bank, and undercharging the tapped two 6Vdc batteries in
the 24Vdc Bank.

Better Idea, would to get a seperate 12Vdc Battery for the 12Vdc
Inverter, and then use a good DC to DC 24Vdc/12Vdc Switching Converter
to charge the 12Vdc Battery from the Main 24Vdc system.

Best Idea, would be to use your 12Vdc Inverter for some other small
system around the place and get yourself a good 24Vdc Inverter for
the Main System.

 Your idea is possible with a battery balancing system.  The size and
complexity depend on your draw on the system and your desired efficiency.

Adam