If you’ve looked into the Sigenergy SigenStor solar energy system, you might have noticed how many different inverter sizes are available. If you don’t know anything about inverters, knowing where to start must be incredibly intimidating.
Don’t worry. At PSC, we know inverters and how to pair them with solar panel systems. There are a lot of inverter options available for the SigenStor system. We know how to pair them with solar panels and help customise them to your unique energy needs and goals.
We’re here as educators first today, and in that spirit, we want you to understand why we selected a specific inverter size for your system.
In this article, you’ll learn about the following:
- Understanding SigenStor Inverter Selection
- SigenStor Single-Phase and Three-Phase Inverter Ratios
- Why These Ratios Exist for SigenStor Inverters
- Choosing the Right Inverter for Your Battery Storage Needs
- Future Expandability with Sigenergy SigenStor
- Key Considerations We Use When Selecting an Inverter
By the end of this article, you’ll know how we choose the inverter size for your SigenStor system.
Understanding SigenStor Inverter Selection
Choosing the right inverter for your SigenStor home battery system is essential for getting the most out of your solar energy system.
Think of your inverter as the translator of your solar system. Your solar panels output direct current (DC) electricity, and your home runs on alternating current (AC) electricity.
The number of solar panels you install will determine the inverter size you need, and different limits apply based on whether your home is on a single-phase or three-phase connection.
Why is this?
Well, it’s a standard practice in solar panel installations to “oversize” the array on the roof in relation to the inverter capacity.
We do this in the solar industry to harvest as much sunshine as possible from your solar system. This helps your panels generate a good amount of power on cloudy days or other situations with shade.
Imagine you’re picking out pyjamas – you wouldn’t just choose the size that fits you exactly; you would go a little bigger to make sure they’re comfy. Solar panels and inverters are a similar strategy.
The SigenStor comes with multiple inverter capacity options. Every single customer of ours has unique energy needs and goals. We customise each system we install based on that, so we love having so many options.
The inverters available for single-phase SigenStor at PSC are: 6kW and 10kW.
For three-phase, the options are 5kW, 10kW, 15kW, 20kW, 25kW, and 30kW.
That’s quite a range, as you can see.
If you’d like to learn a bit more about the cost of SigenStor, we recommend you check out the following article titled, How Much Does the Sigenergy SigenStor Cost?
SigenStor Single-Phase and Three-Phase Inverter Ratios
We mentioned single-phase and three-phase wiring in the previous section. Here’s a quick review of what single-phase and three-phase wiring is.
Single-phase power is a two-wire alternating current (AC) circuit. It consists of one active wire and one neutral wire. Current flows between the active wire (through the home and appliances) and the neutral wire.
Three-phase power is a three-wire AC circuit with three active wires and one neutral wire. Again, current flows between the active wire (through the home and appliances) and out the neutral wire.
Three-phase systems are designed to balance power distribution more effectively, which is why they allow for larger inverter sizes without disrupting the grid.
Consider a three-phase upgrade if your home has heavy energy loads, like industrial-grade appliances or large air conditioning systems.
Their waveforms look different, too. Because a three-phase home has overlapping waveforms, it can provide a steady power supply to the home loads.
This is important because the oversizing for single-phase homes is different from the oversizing for a three-phase home. Understanding this is crucial because it helps inform how many panels are going up on the roof for the inverter to support.
The SigenStor allows up to 200% solar panel oversizing if your home has a single-phase power supply.
That means if you install a 10kW, you can have up to 20kW of solar panels connected to it.
For three-phase homes, the SigenStor supports a 1.6 solar panel-to-inverter ratio, meaning that a 10kW three-phase inverter can support up to 16kW of solar panels.
Three-phase power is common in larger homes and commercial buildings with much higher energy demand.
If you’re interested in reading up on how oversizing works, you might want to check out the following article titled, What is Solar Oversizing in a Microinverter System?
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Why These Ratios Exist for SigenStor Inverters
Solar systems that do not have battery storage usually follow a 1.33 DC-to-AC ratio, meaning that for a 10kW inverter, up to 13.3kW of solar panels can be installed.
However, with hybrid systems like SigenStor, the game changes. DC energy from the solar panels can go directly into the battery, bypassing the inverter and eliminating conversion losses.
This capability allows for greater solar panel-to-inverter ratios without overloading the system.
Inverters transform power from DC to AC and back again. It’s more efficient with fewer power conversions to bypass the inverter, which SigenStor does.
For instance, if you have 20kW of solar panels paired with a 10kW inverter, you can still store up to 15kW of energy directly into your batteries without going through the inverter.
Over an hour, that’s15kWh of energy stored. You can use it later when the sun goes down. This ability to store excess energy makes hybrid systems like SigenStor incredibly efficient and valuable for energy independence.
The value of energy independence you get with a battery is incredible.
If you’re interested in learning a bit more about single-phase and three-phase sites, you might want to check out the following article titled, Single-Phase vs. Three-Phase: How Are They Different?
Choosing the Right Inverter for Your Battery Storage Needs
At PSC, we help homeowners find the best inverter size based on battery storage and solar panel capacity. Here’s a breakdown of typical setups:
- 16kWh of battery storage pairs well with a 5kW inverter and 8kW of solar panels.
- 24kWh of battery storage should be matched with at least a 10kW inverter and around 9kW of solar panels to ensure full charging in winter months.
This approach guarantees that your batteries will be fully charged on most days, reducing reliance on the grid and maximising your solar savings.
If you’d like to learn a bit more about SigenStor, we recommend you check out the following article titled, Sigenergy SigenStor Review.
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Future Expandability with Sigenergy SigenStor
One of the most significant advantages of the SigenStor system is its modular design, which allows you to expand your storage and solar capacity over time.
Homeowners can start small and add more battery modules as their energy needs grow. It’s an ideal solution for those looking to gradually increase their energy independence without committing to a massive installation upfront.
While it is possible to increase solar panel and inverter capacity later, it’s always best to plan ahead and choose the right system size from the beginning.
Homeowners may experience slow battery charging or frequent grid dependence if the system is undersized. To avoid this, we recommend ensuring your solar panel system, inverter, and battery storage are well-matched from day one.
However, with a modular approach, you can also plan for future expansion, knowing that additional batteries can be integrated seamlessly into your existing system.
If you’re interested in learning a bit more about solar batteries, you might want to start with the following article titled, Adding a Battery to a Solar System.
Key Considerations We Use When Selecting an Inverter
When you come and consult PSC, we will sort out how much solar you need and what that inverter size will be based on your needs and goals.
- Your Home’s Energy Demand: A single-phase home might only need a 6kW or 10kW inverter, while three-phase homes or commercial spaces may require 15kW or more.
- Your Available Solar Panel Space: If you have ample roof space, installing more panels now allows you to generate and store more power for later use.
- Battery Storage Plans: If you plan to expand your battery system in the future, make sure your inverter can handle the additional storage capacity.
- Grid Connection Limits: Check with your local grid provider about the maximum inverter sizes allowed for your home.
If you’re interested in learning a bit more about installing a single-phase battery like the Powerwall 3 on a three-phase site, you might want to check out the following article titled, Can I Install a Single-Phase Battery on a Three-Phase Home?
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Just One of Those Phase (s) with SigenStor
The number of solar panels you can install with a SigenStor system depends on several factors, including:
- Your inverter size.
- Battery capacity.
- Whether your home is single-phase or three-phase.
With its higher PV-to-inverter ratios, direct-to-battery charging, and expandable modular design, SigenStor is a future-proof energy storage solution that allows homeowners to maximise their solar investment.
If you’re thinking about installing a SigenStor system, speak with the team at PSC. We’ll help you design the perfect setup to maximise energy production, optimise storage efficiency, and ensure energy independence for years to come.
If you’re interested in learning a bit more about the battery market, you might want to check out the following article titled, Best Home Solar Batteries for 2025.
