Sizing Your System

Buzz stocks single-phase inverters across a few different brands, so "largest" depends on which range suits you. Deye's single-phase low-voltage range goes up to 12kW, Sungrow's single-phase HV range goes up to 10kW, and Fronius's Primo GEN24 range goes up to 10kW.

Keep in mind some single-phase properties have limits set by the local network operator on how much inverter capacity can be connected, so this isn't just a product choice. Check the individual product pages for full specifications, and if you're not sure which model fits your situation, contact us and we can help point you in the right direction.

We can't tell you the right size from a general question like this, it depends on things specific to your home. To size your system correctly, we typically need to know your household's electricity usage (from a recent bill), how many solar panels you're planning or already have, whether you want a battery now or later, and your goals (for example, running mostly on solar during the day versus backup power in an outage).

It's also worth knowing that some inverters, like Fronius's standard Primo GEN24, don't support battery storage at all without an upgrade, so your future plans matter too. Contact us with these details and we'll help you find the right fit.

Sizing a system properly depends on details specific to your household, so we don't recommend a size without knowing them. Useful information includes your recent electricity bills (to see your usage patterns), whether you're adding solar, battery or both, whether the property is single-phase or three-phase, and what you want the system to do, such as reducing your bills, backing up during outages, or charging an EV.

Different brands also have different expansion rules, so it helps to know if you might want to add capacity later. Contact us with these details and we can help match you with the right equipment and an installer for your setup.

Generally, how fast your EV charger charges depends on the charger's own power rating and what your home's electrical supply can support, rather than the size of your solar inverter. Your electrician will confirm what your switchboard and circuits can safely handle.

For fully integrated systems, it can work a little differently. For example, a Sigenergy AC charger doesn't need a full SigenStor system for load management, it uses a separate Power Sensor to keep an eye on total site load. This means charging isn't simply capped by the inverter's rating.

If you'd like to check how a specific charger and inverter work together for your setup, contact us and we can help.

It depends on the battery, and it's worth planning ahead rather than assuming you can top up later. Some batteries, such as Deye's high-voltage rack range, can technically be expanded, but only under tight conditions, including modules needing to be manufactured within about a year of each other, state-of-charge matching using an external charger, and a required consultation with Deye or the warranty may be voided.

It's also worth knowing that government battery rebates are generally claimed once per electricity connection, so adding capacity later usually can't claim extra rebate. The best approach is to size correctly from the start. Contact us with your household usage and goals and we'll help you plan for this properly.