We are putting in a pool and will build a pool house. Now that I think about maybe should relocate it to the far side of the pool house which will be completely separate from the house.
Reserve power is a very nice thing for a house, not sure if you need a whole powerwall though. I've been running a power station in an outside shed on my property for about 20 years now, the core of it is 4 150ah VRLA (Valve regulated lead acid) batteries with a 1kw 24 volt inverter and 1kw of solar panels. About 5-6kw of power, 1kw peak draw, a 10 year life span on the batteries, and they will never catch fire..
In the event of a power failure I can switch to the shed manually for the fridge (300w, 25% duty cycle), a few lights, and most importantly cell phone and internet service (another 20-30 watts) and a coffee maker (70w for a few minutes). In a multi-day power outage the priority is keeping the fridge running and having fresh coffee. Can also run a smaller microwave oven if I need to warm some food up.
Solar panels can top off about 4kw of power a day, giving me around 9-10kw of power. With 2kw for the fridge this leaves me a fair bit of extra power for incidentals or a day or two of rain. Longest I have run it was 3 days when power really went out and it was a life saver.
Not too complex, worth it.
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