Hi
I run my rv 100% electrically. Peak load in cold weather is 7000 watts. That works out to about 168 kwh per day. This is at temperatures of -20 c (-4 f) and below.
An absorption fridge uses about 5.7 kwh per day.
Water heating with zero use is about 1.6 kwh per day. (more if you draw any water of course--about 1.6 kwh for each tank full that is warmed). On the basis of two showers per day about 5 kwh per day.
The 1500 watt heater if running constantly will draw 36 kwh per day.
Computer use is around 60 to 100 watts per hour. Assume 8 hours use, 0.5 kwh per day.
A heat tape may be 60 to 100 as well depending on length. 1.5 khw per day.
Your use could easily top 50 kwh per day.