The Isotherm Cruise
130 manual says:
5 Technical data
Voltage 12 or 24 volt DC also AC/DC as an option
Power consumption when compressor is running: CR 42, 49 & 65: 2,5 - 2,7 A at 12 V (half at 24 V)
CR 130: 4,7 - 5 A at 12 V
CR 130 Drink: 5- 5,3 A at12 V
Average consumption: CR 42 & 49: 0,6 A at 12 V
CR 130: 1,2 A at 12 V
CR 130 Drink: 1,4 A at 12 V
AVERAGE consumption means nothing!
The BD35 compressor uses 5A (60watts) when running. How many hours a day does it run? If it runs 15 minutes out of each hour that would be 6 hours a day or 30 amp/hours.
Your solar panels
should be able to power the compressor with no draw from the batteries at least 8-hours a day. Let us assume that the solar provides half the power needed another 4-hours a day so the BD35 only uses 2.5 amp hours of battery power during that time. During the 12-hours of darkness (no solar output) the compressor would run for 3-hours or so and would use only 15-amp hours of battery power. Those numbers look like they are saying the BD35 is only pulling 18 - 20 amp hours a day out of your batteries or less than 8% of the 270 amp hour capacity.
Something, other than the BD35, is consuming the power.
OR - if you know the actual run time / percentage you can get an exact answer.
Your laptop may use much more power than you realize. A typical 15" screen
laptop will use about 60 watts (5 amps) with the screen
on. If you use the laptop like I do it would be on for 12-hours a day or 60 amp hours. If you watch DVDs on the laptop the power would go even higher.