Solar Panel Expansion

Added an EV or grown your home? We’ll grow your solar system to match.

As your energy needs grow, your solar system should grow with you. We evaluate your current setup, design a compatible expansion, and manage the entire process, from permitting to installation, so you get more clean energy without starting over.

If your original system is a few years old, we’ll also check whether current panels and inverters are still readily compatible, since solar technology changes quickly. When an exact match isn’t available, we’ll recommend the most sensible way to integrate new equipment with what you already have, rather than forcing a mismatch.

Is It Time to Expand?

• You’ve added an electric vehicle
• You’ve expanded your home or added appliances
• Your electric bill has crept back up
• You want more energy independence

What’s Involved

• Evaluating your current inverter’s capacity for more panels
• Designing new panels to match your existing system and roof space
• Handling permits and updating your SMUD interconnection agreement
• Professional installation, testing, and monitoring setup

Once the design is set, we handle mounting and wiring for the new panels, integrate everything with your existing system and monitoring, and schedule the required local inspection before final sign-off. It’s also a natural time to consider adding battery storage, for backup power and more control over when you use your energy.

Mounting Considerations

If your expansion needs a different mount type than your original system, for example adding ground-mounted panels alongside an existing roof array, see our mounting options overview →.

Frequently Asked Questions

Can any solar system be expanded?

It depends on your inverter. String inverters have limits on how many additional panels they can support, while microinverter systems are generally more flexible for expansion. We’ll check yours before recommending a path.

What if my existing system is several years old?

Finding exactly matching panels or components can be harder as technology evolves. We’ll assess what’s compatible and recommend the best way to integrate new equipment with your existing system.

Will I need new permits or a new interconnection agreement?

Yes. Adding panels typically requires a new permit and an updated interconnection agreement with SMUD to reflect the larger system size.

Is it better to size my system bigger now instead of expanding later?

Often yes, since permitting fees and crew mobilization make expanding later somewhat less cost-efficient than sizing up front. That said, if your needs have genuinely grown since your original install, expansion is still a worthwhile investment.

Do you inspect and test the system after adding panels?

Yes. A local inspection and full system testing are part of every expansion, and we reconfigure your monitoring setup to reflect the added capacity.