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Battery Add-On Systems Through SGIP: Frequently Asked Questions

Adding a battery to your existing solar system is a great way to increase your energy independence, lower your reliance on the grid, and gain backup power during outages. Below are answers to some of the most common questions we hear from homeowners about adding a battery to their system.

Can I add more solar panels in the future?

Yes, your battery add-on project under SGIP won’t limit your ability to expand your solar system at a later date. However, SGIP funds will not cover this expansion. At this time, Haven will only process and install the SGIP-funded battery system. If you would like to add solar, we recommend working with a licensed installer to design and permit the expansion after the battery system is added to your system.

Will adding a battery affect my Net Energy Metering (NEM) agreement?

This depends on your eligibility pathway through SGIP. Income-based applications will keep their NEM status. Read more about NEM status + SGIP here.

Will the battery help me save on my electric bill?

Yes, a battery can help you save on your electric bill, even if your solar already lowers your costs. Here’s how it works:

  • Time-of-Use (TOU) shifting: Electricity rates are highest in the late afternoon and evening (often 4–9 pm). A battery can store your excess solar energy during the day and discharge it when rates are at their peak — so you avoid buying expensive power from the grid.

  • Maximizing self-consumption: Instead of sending extra solar back to the grid for a lower credit, you can store it and use it later, increasing your overall solar value.

Over a year, many customers see hundreds of dollars in savings depending on household usage patterns. As an example, A PG&E customer with a typical 7 kW solar system and a 13.5 kWh battery might save $30–$60/month by shifting usage away from peak rates.


Will adding a battery void my solar warranty?

No. A properly installed battery system does not void your solar equipment warranties. The warranties on your solar panels and inverter remain intact. Batteries also come with their own manufacturer warranty, which provides additional coverage and peace of mind.


Are there limitations if I want to add more solar later?

Not really. If you add more solar panels in the future, your installer will ensure the new system is compatible with your existing battery and inverter. The only consideration is that some utilities may require updated interconnection paperwork when you expand your system — but this is a standard process your installer can handle.


Will the battery cost me anything under SGIP?

No. If you qualify for SGIP’s equity-resiliency program, the cost of your battery and installation is fully covered. You will not be billed for the equipment, labor, or interconnection work required for the battery portion of your project.


Do I need to replace or upgrade my solar equipment to get a battery?

In most cases, no. Most existing solar systems can integrate with a battery without changes. In some cases, small electrical upgrades may be required, but these will be included as part of your project design and you would be made aware of any potential out-of-pocket expenses before moving forward with your project. .