How to Add Backup Power to Your Home Solar System for Power Outages

April 29, 2025
BLOG Residential Solar Energy

In the wake of the recent LA wildfires and extended power outages, Xero Solar has been getting a wave of calls from California homeowners looking to expand their solar and battery systems. For many, it’s no longer just about saving on energy costs—it’s about staying safe and comfortable when the grid goes down.

It’s important to understand that a solar system alone doesn’t provide power during grid outages. Adding a battery system allows you to store solar power and use it when it’s needed most, making your home more resilient. This stored power can be used to offset high peak energy usage from the grid or to provide energy during power outages.

Two of our customers summed it up best after the fires. One told us how their battery backup kept their security system and internet up, giving them peace of mind that their house was safe. Another shared that their battery meant they were able to watch the news to see if they needed to evacuate.

If you’re thinking about increasing your energy resiliency, here are the three most common strategies we’ve been recommending:

1. Upgrading an Existing Battery System

If your system already has a battery, upgrading to a newer or larger-capacity model can give you more backup power without needing a complete overhaul. Expanding your storage means you can power more appliances or stay powered for longer during an outage.

Benefits:

  • Quickest and most cost-effective path to more storage
  • Keeps your current solar system largely intact
  • New batteries often have smarter tech for better efficiency

Considerations:

  • Compatibility with your existing system must be evaluated
  • May require inverter upgrades, depending on age of system

2. Adding a New Battery

If you don’t already have an energy storage system, adding a battery allows you to store the extra energy generated by your solar system so you can use it when you need it most.

Benefits:

  • Expands your system to meet your lifestyle and specific energy needs
  • Could further lower your electricity bills if you shift some of your usage to stored energy

Considerations:

  • Space and electrical capacity need to be assessed
  • May require permitting or reconfiguration of your system

3. Combining Batteries with a Generator: Double Redundancy

For ultimate peace of mind, combining batteries with a generator gives you the best of both worlds. The batteries handle day-to-day outages quietly and cleanly, while the generator acts as a failsafe if the batteries run out of power.

Benefits:

  • Covers more extended outage scenarios
  • Generator kicks in only when needed and allows the battery to recharge, preserving battery life
  • Helpful for homes in high-risk fire or weather zones

Considerations:

  • Higher upfront investment
  • Generator and battery need to be compatible
  • Generators need occasional maintenance and fuel storage
  • Must meet local noise and emissions regulations

As weather extremes and grid instability become more common, having a backup power plan is a smart move. Whether you’re looking to add a battery for the first time or add capacity, Xero Solar can help you explore your options and find the right fit for your home. Reach out to us to schedule a consultation.

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