When Should Phoenix Homeowners Charge a Home Battery to Avoid APS On-Peak Rates in 2026?

Phoenix homeowners with a home battery have one daily decision to get right: finish charging before the costly part of the weekday starts. Get that timing dialed in and the battery carries the house through peak hours without drawing from the grid. Miss it, and you end up buying electricity at the highest rate of the day, which defeats most of what the battery was supposed to do.

APS and SRP both serve the Phoenix metro, and which utility you have depends on your address, not your city or ZIP code. The two utilities have different peak windows and different rules for crediting exported solar. This post covers APS time-of-use plans for solar homes.

What are APS peak hours in 2026?

If your address is served by APS, the on-peak window on current residential time-of-use plans runs on weekday afternoons, year-round. It does not change by season. All weekend hours and APS-recognized holidays count as off-peak every week without exception.

That means a fully charged battery only needs to cover a few hours of demand on weekday afternoons. Saturdays, Sundays, and recognized holidays are already off-peak, so your battery can recharge on those days without any timing concern. Confirm the current schedule at aps.com/plans before your installer submits interconnection paperwork.

Set your charge schedule to finish before peak begins

The practical goal is to program the battery to charge from solar during the day and reach a full state of charge before weekday on-peak hours begin. Most battery systems let you configure this in the manufacturer's app, and your installer can walk through the settings during commissioning.

A working approach for most Phoenix homes:

• Let the battery charge freely from solar throughout the morning while production is climbing toward its daily high point.

• Set a backup grid-charge window during overnight hours. On cloudy or dusty days when solar output falls short, the overnight window fills the battery at off-peak rates so it is ready the next afternoon.

• Avoid scheduling any grid charging during weekday afternoon hours.

On clear days, Phoenix solar systems produce their strongest output from mid-morning through early afternoon. A well-sized system typically fills a single battery well before early afternoon, leaving it ready for the household's peak load: cooling running harder, dinner being cooked, and devices being charged.

The APS time-of-use plans for solar homes

New residential solar customers in APS territory currently choose between two plans at aps.com/plans. The standard option is the Time-of-Use 4pm-7pm Weekdays plan, with energy-only charges at on-peak and off-peak rates. All weekends and APS-recognized holidays are off-peak on this plan.

The second option adds a demand charge to the same on-peak window. A demand charge is based on your highest hour of energy use during on-peak hours within the billing month, not your total consumption. A battery that smooths the evening draw can reduce that demand component, but the calculation is more involved than simple energy shifting. Your installer should model both options against your load profile before you decide which plan to enroll in.

Once you are on a plan, switching is not always straightforward. Choose before your installer submits the interconnection paperwork.

When solar production falls short

Phoenix gets reliable sun most of the year, but cloud cover, summer dust, and monsoon weather can reduce output on any given day. On those days, solar alone may not fill the battery before the on-peak window arrives.

Setting a backup overnight charge window handles this. You draw from the grid at off-peak rates to top off the battery, then use that stored power to stay off the grid during afternoon peak hours. Whether running that overnight fill every night is worth it depends on the gap between your peak and off-peak energy rates, which you can find at aps.com/plans.

One thing worth knowing: APS credits exported solar at a flat rate regardless of when the power flows back. Self-consuming your stored solar during the on-peak window is more valuable than sending it to the grid, because you avoid buying at peak rates rather than earning a small export credit. A battery that keeps solar in the house during peak hours gets more value from each kilowatt-hour than one that lets surplus flow outward.

Right-sizing the battery for your household

One battery may not be enough for a large home, a home with an EV charger, or one that wants backup capacity during outages. Battery sizing should reflect your actual load during the on-peak window, not just the space available in your garage.

When you compare installer proposals, ask each one to show projected state of charge at the start and end of the on-peak window. That tells you whether the sizing recommendation fits your daily pattern. A broker that collects competing bids can put those projections side by side so the assumptions behind each proposal are clear. See Can a Home Battery Help Phoenix Homeowners Avoid APS Peak Charges? for how the math typically plays out.

How a battery fits the financing picture

Cash and loan buyers no longer receive a federal solar credit, including on battery storage. That credit ended for systems installed after the close of last year.

A prepaid solar lease works differently. The leasing company owns the equipment, claims a commercial clean energy credit, and passes the savings along at signing. This is not tax advice; consult a tax professional.

Option	Upfront cost	Federal credit
Cash purchase	Full price	None
Solar loan	Low or none up front	None
Prepaid solar lease	One payment	Claimed by leasing company, 30 percent off

For a year-by-year cost comparison, see Prepaid Solar Lease vs Solar Loan in Phoenix.

Start by checking which utility is on your bill. If you are on APS, visit aps.com/plans for the current on-peak window and plan details. Then use the Solar Calculator to rough out a system and battery size for your home. When you are ready to see what installers actually bid, send your bills through the contact page. Phoenix Valley Solar works as a broker, so you get competing proposals from installers who know the numbers matter.

Frequently Asked Questions

What are APS peak hours in 2026?

On the Time-of-Use 4pm-7pm Weekdays plan, on-peak applies on weekday afternoons, year-round. All weekend hours and APS-recognized holidays are off-peak. Visit aps.com/plans to confirm the current schedule before your installer submits interconnection paperwork.

When should I set my battery to stop charging?

Program the battery to finish charging before the on-peak window opens on weekday afternoons. Most battery apps let you set a cutoff time. Your installer can configure this during commissioning so the battery arrives at peak time with a full charge.

Do APS peak hours apply on weekends?

No. On APS time-of-use plans for new solar customers, all weekend hours and APS-recognized holidays are completely off-peak, year-round. Your battery can recharge freely on Saturday and Sunday without any concern about peak timing.

Can I still get help financing a home battery in 2026?

Cash and loan buyers no longer have a federal solar credit. A prepaid lease can come in at 30 percent off because the leasing company claims a commercial clean energy credit and passes the savings along. This is not tax advice; consult a tax professional.