Thinking about adding a battery to your solar system? That’s great! Batteries can help you store energy and use it when you need it most. But do you need to replace your whole solar system to do it? Not always! Let’s look at what you need to think about to make the best choice for your home or business, so you can save money and get the most out of solar energy.
Do You Need a New Solar System for a Battery?
Lots of people are wondering if they need a brand-new solar system to add a battery. The answer is maybe! It depends on a few things, like how old your current system is, how well it works, and what kind of battery you want.
Batteries Can Be Pricey
Even with government rebates (money back), batteries can still cost a good bit of money. You want to make sure you get the right size battery for your needs. If your solar system is small, it might not make enough energy to fill a big battery every day. That means you might not be getting the best bang for your buck.
To find the perfect battery size, think about how much energy you use. Do you use a lot of power at night? Do you want to heat water with solar energy? These things will help you figure out what size battery is right for you. Solar monitoring data can help you understand when you are producing solar, when you are self consuming solar, and how much energy you are exporting to the grid. This is important information that will help size the battery system and make sure your battery system is a good investment.
Check Your Solar System’s Stats
If you have a way to check how much energy your solar system makes, that’s awesome! This information can help you decide if a battery is a good idea. Even the simplest solar systems can tell you how many kilowatt-hours (kWh) they’ve made. Divide that number by the number of days since it was installed, and you’ll get an idea of how much energy it makes each day.
Your power bill also shows how much energy you send back to the grid. If you take the amount of energy you make and subtract the amount you send back, you’ll know how much energy you’re using yourself. This helps you understand if you have extra energy to store in a battery.
For those with a retail “smart meter” you can contact your utility and they’re obliged by law to hand the data over. Plug that file into a solar calculator for a better result than the back of any envelope.
Keeping Your Old Solar Panels
If your solar panels are in good shape, there’s no need to throw them away! They can still make energy even if they’re not the newest models. You can add a battery to your existing system using something called an AC-coupled battery. This type of battery, like the Tesla Powerwall 2 or Alpha, works well with older solar panels.
When to Think About Upgrading
Sometimes, it’s a good idea to upgrade your solar system. If your system is old, it might have parts that could cause problems, like a rooftop isolator. These can be a fire risk. Newer solar systems come with warranties, better monitoring, and can make more energy in the same amount of space. Plus, you can add more panels to make even more power!
Roof Top Isolators are such a terrible idea they were largely written out of the rules. It only took us ten years to get rid of them.
Things to Consider
Even if your solar panels are good, you might need to make some small fixes to connect them to a new inverter (the box that turns solar energy into usable electricity). Some installers might not want to give a warranty on older solar panels because they don’t want to risk problems with the new inverter.
Electricians might also suggest replacing the whole system to make sure it meets the latest safety rules. It’s important to talk to a qualified installer to see what’s best for your situation.
Why New Inverters are a Great Choice
Many installers are suggesting new hybrid inverters, which can work with a battery. These inverters can be installed now, and you can add a battery later. Hybrid inverters can also work with older solar panels or have extra solar panels connected to them for even more power.
For more than a few reasons installers are quoting on new hybrid inverters capable of integrating with a battery.
With rules yet to be finalised for the new battery incentive, most hybrids can be installed now with a battery simply added after July 1st.
Hybrids can also be configured just like an AC coupled battery, with or without additional solar DC coupled straight to them for extra capacity and black start ability
Many hybrids can control a legacy grid connect inverter, using frequency shift to control it during an outage (but without black start ability)
More Power, More Options
A new inverter can also give you more power. Some power companies limit how much inverter capacity you can have. For example, they might only allow 10kW of inverter capacity. A new inverter can let you have more power for backup and more storage for your battery.
Keeping your old inverter may hamstring your future plans.
Seamless Ecosystems
Some companies make all the parts of a solar system, like the panels, inverter, battery, and even EV charger. If you want everything to work together smoothly and show up on one app, it’s a good idea to stick with one brand.
Save Energy First
The best way to save money is to use less energy in the first place! As it gets colder, you’ll need more energy to heat your home or business. Heat pumps and reverse cycle air conditioning are super-efficient ways to heat and cool. Also, make sure your building is well-insulated to keep the heat in and the cold out.
Plan for the Future
Adding solar panels, batteries, or other energy-saving equipment can require upgrades to your electrical system. Make sure to talk to a qualified electrician to plan for these upgrades. Contact Unplugged Energy for a quote.
Conclusions
Deciding whether to upgrade your solar system or just add a battery depends on your specific needs and situation. Consider the age and condition of your current system, your energy usage, and your budget. Talk to a qualified solar installer to get personalized advice. By making the right choice, you can save money, increase your energy independence, and reduce your impact on the environment.
