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Between falling battery prices and diminishing net metering programs, more and more people are installing energy storage at their homes. Adding battery storage to your solar panel system enhances your energy independence and overall savings––but you''ll need an accurately sized system.
The number of batteries you need depends on a few things: how much electricity you need to keep your appliances powered, the amount of time you''ll rely on stored energy, and the usable capacity of each battery. Given the average solar battery is around 10 kilowatt-hours (kWh), most people need one battery for backup power, two to three batteries to avoid paying peak utility prices, and 10+ batteries to go completely off-grid.
Every solar and battery setup is different, and it''s important to consider your unique goals and needs when shopping around for solar and storage options.
The average solar battery is around 10 kilowatt-hours (kWh).
To save the most money possible, you''ll need two to three batteries to cover your energy usage when your solar panels aren''t producing.
You''ll usually only need one solar battery to keep the power on when the grid is down.
You''ll need far more storage capacity to go off-grid altogether.
The number of solar batteries you need depends on why you''re installing an energy storage system. Generally, people use battery storage systems for one of three reasons: to save the most money, for resiliency, or for self-sufficiency.
To save the most money with solar batteries, you need enough energy storage to keep your home self-sufficient during peak electricity pricing hours. Peak pricing hours differ based on where you live and your exact utility plan.
Typically, you''ll need about two to three batteries to avoid using grid electricity during peak hours and when your solar panels aren''t producing power. You''ll still rely on the grid on a cloudy day, but you''ll be self-sufficient enough to maximize your solar investment.
If you can take advantage of one-to-one net metering, solar batteries won''t help you save much extra. Under true net metering, the grid acts as a giant battery for you. Instead of storing electricity and pulling it back out, you collect credits for the electricity you provide to the grid. You can redeem those credits later when you use electricity from the grid, making it so you owe little to nothing on your electricity bills.
Net metering programs vary from state to state and utility to utility. Unfortunately, many utilities across the country have moved away from true net metering to much less consumer-friendly solar buyback programs. If your utility only offers net billing, a battery can help you keep more of your own solar power rather than letting the utility company take it at a discount.
Solar batteries are a reliable way to keep your house and essential appliances energized through extreme weather conditions and grid failures.
A single battery will do the trick if you''re only concerned with keeping a few things running during the average, quick outage.
You''ll need around eight to 12 (or more) batteries to go off-grid. Self-sufficiency requires lots of battery storage, especially if you build capacity for extra-long periods without sunlight (cloudy weather, nights, etc.).
A "load" is anything that consumes electricity—like refrigerators, air conditioners, dishwashers, and other appliances around your home. You''ll need a good idea of how much electricity it takes to power your appliances to size a storage system accurately.
There are a few ways to estimate the electricity load of your home''s appliances and systems:
The Department of Energy''s (DOE) Appliance Energy Calculator. This tool uses the average power requirement of appliances to estimate average annual energy use and cost.
Energy monitoring systems provide insight into how much energy you''re using and when you''re using it. Home energy monitors are specific to your home, and some can even track usage at the individual appliance level.
Lastly, you can do it the old-fashioned way by reviewing your past electricity bills and looking for patterns in your peak usage. What appliances do you normally run at those times? This isn''t a perfect method, but it can give you some insight into your electricity loads if you''re willing to do the research.
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