Battery Storage Without Solar: How It Works for South Bay Homes on SCE

We've been getting a question a lot lately: "Can I get a battery if I don't have solar?" The short answer is yes, and for some South Bay homes it's the right first step. Maybe your roof is shaded, due for replacement, or limited by HOA rules. Maybe you just want backup power before storm season and plan to add solar later. Here's how a battery-only system works with Southern California Edison, and what it can (and can't) do for you.

How a battery-only system works on SCE

Without solar panels, your battery charges from the grid instead of the sun. That sounds like it would defeat the purpose, but it's actually where the savings come from, because SCE charges very different prices depending on the time of day.

A battery-only system is still a grid-connected system, so it goes through the same steps as any battery install: a city permit, and an interconnection approval from SCE before it can be turned on. We handle both as part of the project. And because there's no solar, there's no net metering or export to think about. The battery's whole job is powering your home.

The rate plan that makes it work: TOU-D-PRIME

Having a home battery makes you eligible for SCE's TOU-D-PRIME rate plan, which is designed for homes with batteries, EVs, or electric heat pumps. You don't need solar to qualify. Here's what it looks like right now (SCE bundled-service rates):

TOU-D-PRIME also has a fixed daily charge of about 79¢ (roughly $24 a month) and no baseline credit. Rates differ if you're with a community choice provider like Clean Power Alliance.

The strategy is simple: charge the battery when power is cheap, and run your home from the battery during the 4–9 PM peak. You never have to think about it. We set the battery to Enphase's Savings mode, which follows SCE's time-of-use schedule automatically.

What's it worth? At today's TOU-D-PRIME rates, a single IQ Battery 10C shifting its full 10 kWh into the evening peak every day saves roughly $750 a year: about $450 across the eight winter months and $300 over the summer. A home that uses less power in the evening, say 6 kWh between 4 and 9 PM, would save closer to $450 a year. (These estimates assume about 90% round-trip efficiency and today's rates. Your actual savings depend on your evening usage, how much backup reserve you keep in the battery, and future rate changes. We'll run the numbers on your actual SCE usage.)

Backup power with the Enphase IQ Battery 10C

The battery we install is the Enphase IQ Battery 10C, Enphase's newest generation:

• 10 kWh of usable storage per battery, and you can add more batteries if you need them
• 7.08 kW of continuous power, enough to handle heavy startup loads like an AC unit or pool pump
• LFP (lithium iron phosphate) chemistry, known for safety and long life
• 15-year limited warranty

The battery works alongside the Enphase IQ Combiner 6C, which is the brains of the system. It houses the IQ Gateway, which monitors your home's energy use, runs the charge-and-discharge schedule around SCE's peak hours, and connects everything to the Enphase app so you can see what your battery is doing from your phone. The Combiner also has room for solar circuits, which makes adding panels later straightforward.

Whole-home backup without a panel overhaul: the IQ Meter Collar

The traditional way to add battery backup is to move your most important circuits into a separate "critical loads" sub-panel, which means extra equipment, extra wall space, and extra labor.

The Enphase IQ Meter Collar is a simpler approach. It installs right behind your SCE electric meter, between the meter and the socket. When the grid goes down, it automatically disconnects your home from the grid and lets the battery power the whole house: no sub-panel and no rewiring of circuits. SCE is on Enphase's list of utilities that have approved the IQ Meter Collar, so it's an option for homes across the South Bay.

What battery-only can and can't do

We'd rather you know this up front. A battery without solar has no way to recharge during an outage. Once it's drained, it stays drained until the grid comes back.

For the typical outage, lasting a few hours to about a day, a well-sized battery has you covered, especially if you go easy on big loads like AC, electric ovens, and EV charging while it's running. For longer outages, you'd want more battery capacity or solar to recharge it. With this winter's strong El Niño expected to bring more storm-related outages (see our El Niño outage prep guide), it's worth sizing for the outages you actually expect.

The good news: an Enphase battery-only system is a solid foundation. If you add solar later, the panels connect into the same IQ Combiner 6C and work as one system.

What about incentives?

It's worth being clear about the numbers. The 30% federal tax credit for home batteries ended for systems placed in service after December 31, 2025, so homeowners buying a battery today don't get it. California's SGIP battery rebate has closed its main budgets to new applicants. The remaining state-funded budget for income-qualified households is currently on a waitlist. We'll let you know if you might qualify.

Our take

A battery-only system makes the most sense if you want reliable backup power now, your roof isn't ready for solar, or you want to get on TOU-D-PRIME and stop paying peak prices every evening. If you're curious whether it fits your home, we're happy to look at your SCE usage and give you a straight answer.