adding a solar battery

Should I install a solar battery now, or add it later?

Energy storage is the rising star of renewable energy. And with this popularity comes an increasingly common question: should I install a battery with my solar panel system now? Or, should I wait and add one later on? In this article, we’ll dive into some of the most important factors to consider when making that decision.

Find out what solar + storage costs in your area in 2022

Key takeaways


  • Solar batteries can provide added resiliency during outages or enable you to use solar energy even at night.
  • Often you can take advantage of incentives — both federal and state — to help offset the cost of purchasing battery storage.
  • There are some things to consider when it comes to retrofitting your home with battery storage.
  • You can use the EnergySage Marketplace to browse for solar panels and battery storage options based on price, efficiency, brand, quality, and more. 

Why do you want a solar battery in the first place? 

Before deciding whether you want to install a battery now or in the future, ask yourself: why do I want a battery? Do I need one?

A battery is a big purchase – one that typically adds more than $10,000 onto your overall cost to go solar. And in some areas of the country, you may not see a financial return on that upfront investment.

A solar battery can help you save money if your utility has demand charges, time-of-use rates, or doesn’t offer net metering – by storing solar electricity on-site in a battery, you can avoid pulling expensive electricity from the grid when your solar panel system isn’t generating enough power to meet your needs (like at night).

Resiliency is another good reason to add a battery to your solar panel system. If you experience frequent power outages and want to keep your lights on when the grid goes dark, a battery can help you do just that. Installing a solar battery for home backup may not save you money in the long run, but that doesn’t mean it’s not worth it: after all, you can’t put a price on peace of mind, right? 

If none of these reasons jump out at you as compelling enough to add a battery, that’s okay! It probably means you shouldn’t install one right now. But if you know you want a battery just need an answer on timing, read on.

Pricing and available incentives

Battery costs continue to fall, and quite rapidly – in fact, between 2010 and 2019, lithium-ion battery pack prices dropped 87 percent! We don’t have a crystal ball, but it’s fair to assume that a storage system you buy right now will likely have a higher price tag than a comparable technology a few years down the road. However, that’s not necessarily a reason to wait, especially if you can take advantage of incentives that won’t be available down the line.

Solar batteries and the federal ITC

Perhaps the best case to make for buying a battery now instead of later is the federal investment tax credit (ITC). If you install a battery with your solar panel system today, you can claim up to 26 percent of those costs as a credit on your federal taxes, which means a credit of around $4,000 for the average battery system. However, the ITC will step down to 22 percent in 2023, and expire for homeowners in 2024.

Waiting too long to install a battery will mean missing out on this lucrative incentive, and potentially paying more for your battery than you would have with the credit in place. (Note: standalone storage systems are not currently eligible for the ITC; you need to charge your battery with an on-site renewable energy resource–like solar–to claim this credit.)

Also, when considering incentives, keep an eye out for more than just the ITC: many states or utility companies currently have limited-time incentive programs in place to promote solar-plus-storage adoption. Popular examples of this today include: 

So before you decide whether to install a battery now or later, make sure to learn more about the current incentive opportunities in your area – and the date when they’ll no longer be available.

Solar battery installation costs

When you buy a solar-plus-storage system, you’re paying for more than just hardware – you’re also paying for the cost of the installation, including labor and permitting.

Installing your solar panel system and battery at the same is certainly more efficient for your installation company: doing it all at once means fewer truck rolls and hours of work. Because of this, installing your solar-plus-storage system at the same time rather than in separate stages is often less expensive from a labor perspective. 

Another cost-saving consideration? Permitting and interconnection costs. These days, most local jurisdictions require installers to pull electrical and/or solar-specific permits before working on your property, and they bake this cost into the turnkey price of your solar installation. The same is true for interconnection to the grid – your installer will work with your utility company directly to apply for interconnection, and include that fee into your total system cost.

Permitting requirements vary by area, and there’s a chance your installer may only need one, all-encompassing permit and interconnection application for their electrical work on a solar-plus-storage system. If that’s the case, then filing a permit for a solar-plus-storage system will likely be less expensive (and take less time!) than filing a solar permit, and going back later to obtain another for your battery install.

And while we’re on the topic of installation fees, you have more to consider than truck rolls, permits, and interconnection fees as far as costs are concerned:

Retrofit system integration 

Adding a battery onto an existing solar panel system doesn’t have to be complicated, but it certainly can be. The difficulty of connecting a battery–and the additional cost it adds to your install–heavily depends on the configuration of your solar panel system and your existing hardware. 

Going back and adding a battery at a later date isn’t always an easy “plug and play” process – depending on the circumstance, upgrading to a solar-plus-storage system may involve swapping certain components of a solar panel system for new, battery-friendly alternatives. Plus, some batteries are much easier to retrofit onto a solar panel system than others. 

Most of this complexity is due to your inverter setup, and whether the battery is a DC-coupled or AC-coupled solution. The majority of retrofit battery installations are AC-coupled: because solar panel systems already include an inverter, it’s more cost-effective to keep that inverter exactly where it is and install a separate inverter to handle the alternating current (AC) to direct current (DC) inversion for the battery.

That said, DC-coupled systems–which only require one inverter for the battery and solar panel system–are more efficient, giving you more bang for your buck (or rather, energy output for energy input).

If you want to install a DC-coupled battery system, we highly recommend installing your solar panel systems and battery at the same time – the complications of adding a DC-coupled storage system to an existing solar panel array will be extra costly. But if you’re mostly interested in AC-coupled battery solutions, you have more flexibility on your timeline.

The bottom line on getting a solar battery now or later

When it comes down to it, whether you should install a solar battery now or plan for a retrofit installation depends on your priorities, budget, and specific situation…we know, probably not the straightforward now-or-later answer you were looking for! Above all, if you decide to wait and see, remember to ask your installer to build a storage-ready solar panel system – this will save you from a lot of headaches down the road. 

Ready to explore your solar-plus-storage options? Sign up on the EnergySage Marketplace to receive free custom solar quotes from local installers.

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About Kerry Thoubboron

Kerry is an expert in all things solar! She's worked in the industry for more than 6 years, starting her career as an Energy Advisor dedicated to helping customers compare their options and make well-informed solar decisions. She graduated from Boston University with a degree in Environmental Analysis and Policy. Outside of work, you can find Kerry snowboarding, watching The Office, or having passionate debates about which New England state is best (spoiler: it's Vermont).

2 thoughts on “Should I install a solar battery now, or add it later?

  1. EMMANUEL T KOTEY

    I wanted to have both solar panels and storage batteries installed together as any time we have a rain storm our power goes off (the whole residential area gets a black-out) I discussed this with the sales agent but surprisingly he discouraged me with the excuse that the battery is a new thing introduced to the solar system and it’s not worth the investment. That batteries are yet to be tried and tested, unlike the solar panels that had been in existence for a long time. He eventually ended up signing me to only the installation panels.; that happened on August 9. Now I hear the new deal signed has been signed by
    the government raising 30 percent to cover batteries. they are about to submit my application to the city for approval starting tomorrow August 22, Please advise as I am still interested in having the battery
    as well.

    Reply
  2. Darrell Adams

    We have electric meters for our barn & house. Can one system feed both buildings with a DC-coupled option?

    Reply

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