What are the different operating modes for SunVault® Storage?

SunVault can operate in the following three modes:

  • Self-Supply mode enables you to maximize your use of solar energy and minimize the amount you import from the grid during the day. This setting is the most environmentally friendly, because it serves home loads first with solar energy, then with stored energy from SunVault, and finally—only if additional energy is necessary—by importing electricity (electrical energy) from the grid. While in Self-Supply mode, SunVault works to minimize your use of utility energy while either solar or stored energy is available by tracking your power requirements and calculating (at 15-minute intervals) what is necessary to achieve net zero. Net zero can be achieved when your home is generating as much energy as it’s using, enabling you to buy less energy from the grid!

  • Cost Savings mode enables you to limit your use of grid energy during peak times, when electricity is most expensive. Typically, Time-Of-Use (TOU) rate plans offer lower rates during daytime hours and higher rates in the evening. So, by storing electricity when rates are lower and using it when rates are at their highest, you can optimize your savings. Depending on the mode chosen and what your local utility allows, Cost Savings mode means your SunVault® system will discharge electricity to your home at peak times as defined by your rate plan until it reaches your selected reserve charge level. You can adjust your rate plan and reserve charge level by setting up Cost Savings mode in the mySunPower® app. If you have a tiered or flat rate plan, your SunVault will not discharge because there are no additional savings. Cost Savings mode is not currently available in all regions.

  • Reserve mode lets you maintain your SunVault system in a fully charged state in anticipation of a Public Safety Power Shutoff (PSPS) or expected storm. In Reserve mode you can reserve 97 to 100% of your battery power. SunVault will use a small amount of energy each day to self-power and will recharge when solar energy is available.

Operating modes features are subject to change or may vary with a Power Control System(PCS) system is in place.

How do I change operating modes for my SunVault?

You can select your operating mode in your mySunPower® app. From the SUNVAULT tab you’ll see the current operating mode and can change it by simply tapping EDIT to select among Self-Supply, Cost Savings, and Reserve modes.