Backup Power for Pool Owners: Pumps, Freezes, and Green-Water Math
Pool equipment and outages: pump loads, freeze protection failure, how fast pools turn green, and generator sizing with a pool.
Pool equipment is a motor farm: main pump, cleaner booster, heater, salt cell, automation. An outage in summer starts the green-water clock; a winter outage in freeze-protection season can burst plumbing. Here's what pool owners need to know about backup power.
The loads
Main pumps run 1,100 to 2,500W (variable-speed at low RPM far less), booster pumps add more, and heat pumps are the monster at 4,000 to 6,000W. For sizing, the pool usually rides the generator's managed-load tier: it runs when the A/C isn't surging.
Summer: the green clock
Standing warm water without circulation or sanitation turns in 2 to 4 days depending on heat and load. A daily few hours of generator-powered circulation plus maintained chlorine keeps a pool through a week-long outage; total neglect means a $200 to $500 recovery treatment or worse.
Winter: the freeze risk
Freeze protection works by circulating water; a power loss during a hard freeze exposes pumps, filters, and above-ground plumbing to burst damage that dwarfs any generator's cost, this is the Texas-winter lesson. If your region freezes, put the pool pump explicitly on the backed-up load list.
Quick Answers
Will a 22kW generator run my pool and A/C?
Usually yes with load management: the pool pump runs in the gaps around HVAC surges. We spec it from your equipment list, free.
How long can a pool sit without power?
Two to four summer days before visible algae; less in extreme heat. Even 2 to 3 hours of daily circulation on generator power holds the line.
Does freeze protection need backup power?
In freeze-prone states, absolutely: it only protects while pumping. It's a small load with a large failure cost, the exact profile backup power exists for.