3 way fridge

Just thought I would share this
Recently converted a crafter to a campervan
Fitted a SMAD 3 way fridge
Instructing as clear as mud
So here is what I have learnt so far
While the test were going I also had 500 watts of solar working so amp draw is not consistent

Voltage at 13.56 14v
Setting min red temperature time amp draw aH

6 13.56 5.15 167
5 14.22 4.00 161
2 16.20 6.40 154
Blue -2 18.20 6.37 136
-4 21.30 7.80 136
Voltage at 21.30 13.1v

Two days later working off inverter 1500 watts 195amh volts 13.9
Freezer blocks put in fridge over night

Setting red min temperature time amp draw aH

5 14.00 6.40 195
3 15.30 7.00 190
Setting blue max 3 15.30 5.00 190
0 16.30 6.00 186
-2 17.30 7.00 180
Setting red about half way
2 20.00 1.00 179
Conclusion

It seems that the thermostat only controls temperature while working off 220v
No control while working off gas or 12v
While it is not feasible to try and modify the system while working off gas
I should be able to add a thermostat to control the 12v like the one below
Hope this makes some sense