In my house I have 3 small air conditioning systems running at 8000 BTU/hour each. I would like to power them with solar energy. I found that I would have to generate:
3.41 BTU/hr = 1 Watt 8000 BTU/hr = 2346 Watts
That means to power the 3 units for 4 hours/day, I would need (2346 Watts* 4 hours/day * 3) = 28152 W*hours/day, or approximately 30 kWh/day.
I checked that in my region, I have 7 hours of sun each day. So to generate 30kWh/day, I will need something like 5kWh/hour = 5000 Watts.
Are these calculations right?
Going further, I'm able to generate now (i have 4 * 250 watts solar panels) 1kW, but I generate it 7 days per week, and I use the air conditioners, maybe 2 times/week. Thinking in this scenario, I don't have to be so concerned about how much energy can I generate hourly/daily, but weekly right?
Another important point here is the batteries where I will store the generated energy right? Any suggestion which kind of batteries set should I use?