Advice on deep cycle setup?

BFL13 wrote:
"Are you suggesting that the MPPT will perform as a PWM in Absorption and only deliver 2A?"

No. The controller is still a buck converter even though it is not doing the tracking for MPP anymore once it goes to Absorb from Bulk.

So it is still output watts/battery voltage for the amps. In Absorb it reacts to "demand" so if the load goes up, it will provide more amps to supply that load, up to what the solar conditions at the time allow for that array.

The load 12v things get first crack at any solar output, with the battery getting anything left over (same as with a converter when you are on shore power) so if the controller has gone to Absorb, meaning the batteries are fairly high in SOC, the battery voltage will still be quite good for a while even though the load has gone up-with solar taking some of it.

Eventually, the battery voltage will fall under its share of the load and get down to the controller's setting for restarting Bulk (and so MPPT)

Not sure about PWM with those 100vmp panels. PWM controllers usually have Voc limit around 50 volts.

Not unusual:
My Morningstar TS-45 PWM controller has:
• Max. solar array Voc 125 V
• Max. operating voltage 68 V
The latter 68V is apparently to provide for charging a 48V bank. The 100V would be within limits, plus I could run 36 such panels in parallel and still adhere to the 'TS-45 36 amps Isc' limit for input Amps.

Back to the question:
You say that the MPPT switches mode from MPPT to PWM at the beginning of Abs. I cannot believe that the ALL MPPT controllers can be reduced to PWM like that which in this case leave only a 2A charge in Abs.

I can understand a switch to PWM whenever it is more efficient as when the Isc exceeds the battery's demand. At that point there is no reason to use the MPPT circuits.

HTH;
John