Sorry about the lack of context. My home is an airbnb in Palm SPrings, CA. Guests heat the pool up to 90 degrees and the jacuzzi to 102 in the winter. Before gas prices skyrocked here a normal bill with this usage would be about $900. Anyway, the bill is directly correlated to the pool and jacuzzi heat. The ammout of therms consumed for that huge bill was about 550. The only other thing that runs on gas is stove and heat in the house. Heat in the house isn't used that much though.
If you're saying you used 550 therms of natural gas to heat your pool/jacuzzi, I don't think you have a grasp of the enormity of that energy usage.
1 therm of natural gas is 29.3kWh of energy.
The average home in the United States uses about 30kWh/day of
electricity. Let's call those equal.
In ONE MONTH, you used 1.5 YEARS worth of equivalent electrical energy that the average U.S. home consumes.
550 therms/month
550/30 = 18.333 therms/day = 537kWh
For perspective, my 2300 sq-ft home in PHOENIX with temperatures that push 120°F never uses more than 120kWh/day, so your energy needs are over 4X the A/C requirement of my Phoenix home.
Let's say you can realistically offset half of this... so 537/2 = 268.5kWh/day.
I expect you have pretty exceptional sun even in Winter, so we'll use 5 solar hours.
You need 268.5/5 = 54kW of solar to generate this much energy daily.
Yes. That's 54,000W of solar panels. This is a huge amount, and you likely do not have enough space on your entire property to accommodate this. You're likely looking at a system that costs $100,000 to offset HALF of your natural gas usage.
Using your pool dimensions, I ran some numbers to sanity check this, and it takes about 633kWh (about 21 therms) to heat your pool volume from 68°F to 90°F. This does NOT take into account any losses to the air or earth, so it's likely low.
I would encourage you to confirm the 550 therms number. Does the house have a leak?
I vigorously recommend you consult a pool pro, plan for solar water heating, and investigate a pool cover:
Check out the deal on Flush Track Automatic Cover - Up To 499 SF at Royal Swimming Pools
www.royalswimmingpools.com