We own a piece of rural property in the mountains, which is completely off grid. We have a new trailer on the property with solar panels, 500-amps of lithium batteries as well as a large generator. The trailer is permanently set in its location.
We're thinking about putting a hot tub close to the trailer but have some considerations to contend with. Hopefully some experienced folks can help shed some light on what's doable and what's not.
1. We're looking at a 3-4 person hot tub that would run at 20-amp / 110-volts. It would be plugged into our generator, which has 20-amp outlets. I understand these types of hot tubs come with roughly a 12' power cable, but our generator is about 35' away from where we'd setup the hot tub. From what I gather you're not supposed to use an extension cord, however we'd have to anyway. I can get a 25' 12-awg/3 extension cord, would that work for that long of a run?
2. Since the hot tub would be off when we're not there, which is every couple of weeks I'm concerned about water filtration. I could add a pond pump to the hot tub and connect that to the trailer to run 24/7 as those are low wattage. Would that circulation prevent the water from being stagnant? Obviously I can run the hot tub's filter when we're there.
3. Based on our situation and you can even say limited use, what would be realistic water change intervals?
4. How long should we expect a hot tub based one what I've described here to heat up?
Thanks in advance for any input I can get.