When a storm knocks out your power in the middle of winter, a solar battery can be a lifeline. With the right battery setup, you can keep essentials like your lights, refrigerator, and medical devices running during a power outage.
If you’ve been thinking about installing home solar panels with battery storage, however, you might be feeling overwhelmed by the sheer number of options available.
At Cascadia Solar, we help homeowners across the Olympic and Kitsap Peninsulas backup their homes with solar plus battery systems. This guide walks you through the basics, along with our battery recommendations for houses in Western Washington.
Key Factors to Consider When Choosing a Battery
1. Storage Capacity – What Do You Want to Back Up & For How Long?
The first questions we ask when talking about battery backup are simple: What do you want to power during an outage? And for how long?
Your answers to these questions steer us toward the right battery for your home, starting with how much storage capacity you need. Storage capacity is the amount of electricity a battery can hold. The more you have, the more you can back up and the longer your battery will last during a power outage.
Most home batteries can store somewhere between 10 and 15 kWh of electricity. That’s enough to power essentials like your lights, outlets, and small appliances for several hours to days without recharging.
If you only want to back up the basics (think lights, fridge, outlets), you’ll need less storage capacity—probably just one battery. If you’re aiming for whole-home backup, or long-duration backup of your essentials (over a week), you’ll need at least 2-3 batteries to provide sufficient backup.
At Cascadia Solar, we size your battery system based on your specific backup power needs. We’ll help you prioritize what you want to back up and size your system accordingly.
If you’re looking for a lot of storage capacity, a FranklinWH battery is a great choice. It holds 15 kWh per unit, and you can stack up to 15 batteries together.
2. Peak Power Output – Can It Run Large Appliances?
Some appliances, like heating systems and well pumps, need a lot of energy to start. If you want to back up a large load like that, you need to think about peak power output.
Peak power output measures the amount of energy a battery can deliver at once to start an appliance.
Advanced batteries like the FranklinWH aPower 2 have high peak power output ratings and can start large loads. But there’s a tradeoff: the more power you draw at once, the faster your battery drains. This becomes especially important during winter outages, when there’s less sun to recharge your battery.
If you want to back up large appliances for longer periods, a generator might be the better option. Alternatively, you can consider a hybrid setup that combines solar panels with a battery and a generator. Learn more about solar panels vs generators for emergency backup power.
3. Lifespan & Warranty – How Long Will It Last?
A home battery isn’t something you want to replace often. Lifespan and warranty coverage are key indicators of how long a battery will perform reliably, and how much protection you have if something goes wrong.
Most batteries last 5 to 15 years, depending on usage and quality. A 10+ year lifespan is ideal, and the warranty should match or exceed that to ensure you’re protected.
We typically recommend Enphase IQ and FranklinWH aPower 2 batteries, both of which come with a 15-year manufacturer’s warranty. Plus, we add a 10-year workmanship warranty, so you’re fully covered.
4. Monitoring Capabilities – How Do You Track Capacity?
Home batteries come with apps that let you track your charge level, see where power is flowing, and make changes.
Solar inverters (part of your solar panel system) also have apps that track your output and notify you of any problems.
If you install solar panels and battery backup, you’ll have two apps to manage, so it’s worth considering keeping everything under the same ecosystem. Enphase, for example, manufactures both inverters and batteries that can be connected under the same app. That makes it easier to keep track of everything without having to shuffle between apps.
Find the Best Battery for Your Home on the Olympic or Kitsap Peninsula
The “best” battery for solar power storage really depends on your goals—whether you want to back up essentials, your entire home, or become as independent from the utility grid as possible.
At Cascadia Solar, we design custom battery systems around your specific goals. We typically recommend FranklinWH, Enphase, or Tesla batteries for houses in our region, but we’ll always help you compare options and choose the setup that fits your needs and budget best.
Whether you’re adding a battery to an existing solar system or starting fresh with solar plus storage, our team is here to guide you every step of the way.
