using 24 volt to controller to charge 12 volt battery

After running a compact, energy saver, fridge[1] for a couple of days I noticed that my battery was not coming up to full float. (13.7v). I'm running my panels in parallel but thinking of trying them in series so I can increase the volts(24) to the controller even though my battery is only 12v. The wiring is 30 feet from panels to controller - though I could probably manage 10 feet if I move the controller/batt to another location in my (very well insulated) shed, if I drill another hole for the cables.

Is the only way to do that either to :
1) use an MPPT [2]
2) add another battery?
3) find a more efficient fridge[3] - this one is _very_ efficient however, I must say (and avoid the overhead of the inverter - I have not been that thrilled with the inverter, which 'seems' inefficient. It is a Windy nation inverter.  /ducks)

I'd be grateful for any advice you can provide.

Paul

PS: Truthfully, I'm a total solar noob and started out with a Windy Nation kit but have decided to try Renogy after purchasing the controller and small panel for my landscape lighting(works great). I'm using these 2 tiny systems to get my legs under me before I embark on a home system.


1] www.amazon.com/Frigidaire-FFPH31M6LM-3-1-Compact-Refrigerator/dp/B003U3L9A4/ref=sr_1_sc_1?ie=UTF8&qid=1440166920&sr=8-1-spell&keywords=fridgadair+compact+fridge

2] www.amazon.com/Tracer1210RN-Solar-Charge-Controller-Regulator/dp/B008KWPGS6/ref=sr_1_7?s=lawn-garden&ie=UTF8&qid=1440168242&sr=1-7&keywords=renogy+mppt

3] www.amazon.com/dp/B005X97OHA/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=10776D874NBDU&coliid=I4VWLEPH6WR0F