No float for 13 days

Don't worry too much about not reaching float with a Morningstar TS controller, it's very common to stay in PWM mode never reaching float. Will post a detailed explanation from Morningstar tech support when I find it. Assuming everything is otherwise working fine, don't loose any sleep over this.

Here is the detailed explanation

The duty cycle is used to determine when to transition into float. The duty cycle is derived from a square waveform and the percentage of time - out of each complete cycle - when current is allowed to flow. Current is regulated by opening and closing the PV-battery circuit -- the essence of a series charge controller. A 50% duty cycle means that current is flowing, and interrupted for, half of the cycle. Our controllers pulse with a frequency of 300 Hz, so each cycle lasts 1/300th of a second. By varying the duty cycle, we can control the average current going into the battery so that the regulation voltage is maintained but not exceeded. As the battery reaches full charge at a particular voltage, it will require less and less current to maintain that voltage and the duty cycle will decrease. The duty cycle will approach zero %, but will never actually get there because losses and battery self-discharge require at least some current to maintain regulation voltage. A Morningstar PWM controller's float transition algorithm waits for the duty cycle to reach 30% or less before starting a one hour timer. When the timer expires, the controller moves from absorption to float voltage. A 30% duty cycle simply means that 30% of AVAILABLE charging current is allowed to pass. Duty cycle is the best measure we have to determine how deep a battery may be in regulation. Factors affecting the accuracy of this method include: 1. Reduced radiation and current. With less available charge current, the duty cycle will inevitably be higher making the transition to float more difficult; 2. Load on the battery. Loads on the battery drain current from the battery which causes a higher duty cycle. If the load is large enough (greater than the amount of solar current ) it can pull the controller into 100% duty cycle and out of absorption - into bulk charging; 3. Aging batteries. Old batteries tend to absorb more current at regulation, keeping duty cycle high. Sulfation leads to higher internal resistance, and more energy loss in the form of heat, which leads to excessive water loss. 

A few comments since you edited the first post, the refrigerator is a load that may prevent the controller from reaching float, the array may be marginal, there is no remote temperature sensor to compensate for cold/warm batteries, well worth having.

Based on daily Ah I would agree double array capacity would be about right, if the batteries are close to new, double their capacity if possible, your demand is about equal to mine, I found 260Ah of battery, my first, was not sufficient for a no generator system. See signature below.

That would make me even cheaper I guess, I'm in Thailand full time😎