Home battery: single-phase or three-phase? How to see what you have and what you need
Last updated: 26 September 2026 · By Team Multi-Solar, home batteries since 2022, Rotterdam
With a single-phase connection, electricity enters your meter cupboard through one line; with a three-phase connection, through three. A single-phase home battery works on both connections; a three-phase battery only works on a three-phase connection. For most households with a plug-in home battery, single-phase is more than enough. Three-phase only becomes interesting at high power, such as a heat pump, EV charger or a large fixed system. Below, three checks show you what you have and what that means for your choice.
What is the difference between single-phase and three-phase?
| Single-phase connection | Three-phase connection | |
|---|---|---|
| Main fuse (examples from Liander) | 1 × 25 A (5.7 kW), 1 × 35 A (8 kW), 1 × 40 A (9 kW) | 3 × 25 A (17 kW), 3 × 35 A (24 kW) and higher |
| Main switch | 2-pole | 4-pole |
| How the electricity comes in | Through one phase (L1) | Spread over three phases (L1, L2, L3) |
| Typical for | Apartments, older terraced houses | New-build homes, homes with induction, a heat pump or an EV charger |
| Suitable battery type | Plug-in home battery, single-phase fixed battery | Plug-in home battery (per phase), single-phase or three-phase fixed battery |
The power in kW is the maximum your connection can carry. With three-phase, that is roughly three times as much as with the same current on single-phase, because it runs over three lines.
How can you tell whether you have single-phase or three-phase? Three checks
- Look at the main fuse in your meter cupboard. One main fuse or main circuit breaker, labelled something like 1 × 25 A or 1 × 35 A, means single-phase. Three side by side, labelled 3 × 25 A, means three-phase. The main switch gives it away too: 2-pole for single-phase, 4-pole for three-phase.
- Look at the display or the rating plate of your smart meter. If it only shows L1, it is single-phase. If it shows L1, L2 and L3, or “3 × 230/400 V”, it is three-phase.
- Look at your appliances. An induction hob, EV charger or heat pump on a three-phase power supply almost certainly means three-phase. Still unsure? Log in with your grid operator: the connection capacity of your address is listed there.
Never work behind the main switch yourself. Anything that needs to be done in the meter cupboard should be carried out by a certified installer; with us, that goes through a quote.
Can a single-phase home battery be used on a three-phase connection?
Yes, and that is the situation for most plug-in home batteries in a three-phase home. The battery is physically connected to one phase, but the smart meter records consumption and feed-in for the entire connection as one total. If the battery supplies power on L1 while the washing machine runs on L2, the meter sees a net zero: nothing comes from the grid and nothing goes to the grid.
The battery does need to be controlled on that basis. With Marstek, you select the “three-phase sum” mode (driefasensom) in the app: the battery adds up the values of all three phases and charges or discharges based on that total, even though it is itself on one phase. Marstek recommends this mode for every three-phase connection. The “single phase” mode is only intended if both your home and the battery are single-phase.
Two limits remain. The battery supplies at most the power of its own phase (800 W via the wall socket), and it can only compensate for what the meter sees as a total. With a fixed single-phase system in a three-phase home, the installer also pays attention to the distribution across the phases, so that the load stays balanced.
Can a three-phase home battery be used on a single-phase connection?
No. A three-phase inverter or battery needs three phases to work. If you want such a system, you first apply to your grid operator for an upgrade of your connection via mijnaansluiting.nl. Liander describes five steps: preparation, application, contact with the work planner, contact with the contractor, and the upgrade itself. A 4-pole main switch is required; without the right switch, the technician is not allowed to carry out the work. When the grid is congested, it can take longer. After that comes the installation of the battery, via a quote.
Plug-in home batteries are single-phase: what does that mean in a three-phase home?
Every plug-in home battery works on one phase, via the wall socket, with a maximum of 800 W. In a three-phase home this works just fine, thanks to the measurement across the whole connection. If you want more, there are two routes.
- A second battery on another phase. This gives each phase its own 800 W. Marstek states that multiple units across the phases, or multiple units on the same phase, are only allowed after inspection and approval by a certified electrician. You still only need one P1 smart meter dongle (P1-meter); you pair each battery separately in the app and set it to the correct phase method.
- A dedicated circuit. Then, for example, the Marstek Venus E 3.0 supplies 2,500 W instead of 800 W. This also goes through a quote.
There are two ways to measure. The CT003 P1 meter reads the smart meter and works with the total of the connection. The CT002 Smart meter is a three-phase kWh meter on a DIN rail that measures per phase, up to 100 A per phase; it is mounted in the consumer unit. Which meter suits which situation is explained in P1 meter or CT clamp, and why the limit is 800 W in the 800 W rule. All meters can be found under battery accessories.
When should you choose a three-phase home battery?
- A heat pump, EV charger or induction hob running at the same time. Your home then demands several kW at peak moments, spread over three phases. A three-phase system supplies power on all three at once.
- A large fixed system with high charging and discharging power. The Sungrow SBH100 kit with SH10T inverter supplies 10 kW spread over three phases and is exclusively for three-phase connections. The Sigen Energy Controller is available from 5 to 25 kW and suits a three-phase connection with a heat pump or EV charger. The HyxiPower All-in-One kit is also a three-phase home battery, and the Growatt APX 2.0 kit and the AlphaESS Smile G3 kit are available with a single-phase or three-phase inverter.
- Staying flexible. The Enphase IQ Battery 5P FlexPhase is set to single-phase (up to 3.84 kVA) or three-phase (up to 1.28 kVA per phase) during installation.
- Backup power for the whole house. See below.
All these systems are connected by a certified installer; installation goes through a quote. How much capacity you need is explained in how many kWh of home battery you need.
How do backup power and phases work together?
During a power cut, a plug-in home battery only keeps the appliances running that you connect directly to the backup power outlet. A fixed system can take over the whole house, but then the switchover has to match your connection. The Sigen Energy Gateway HomePro is available in a single-phase and a three-phase version and switches over in 0 milliseconds, so computers and lighting do not notice a thing. With Enphase, you combine the IQ Battery 5P with the IQ System Controller for full backup. The measurement per phase comes from a three-phase smart meter such as the Sigen Sensor.
Frequently asked questions
Can a three-phase home battery be used on a single-phase connection?
No. You first need an upgrade to three-phase via your grid operator, including a 4-pole main switch. After that, an installer can install the system.
When do I need a three-phase home battery?
When you want to supply several kW spread over three phases at peak moments: with a heat pump, EV charger or induction hob running at the same time, or with a large fixed system. For an ordinary household, single-phase is sufficient.
Does a plug-in home battery work on a three-phase connection?
Yes. It is connected to one phase, and the smart meter records the total of the connection. In the app, switch on the mode for a three-phase connection, with Marstek “three-phase sum” (driefasensom), so the battery controls based on that total.
Do I need to have my connection upgraded for a home battery?
Not for a plug-in home battery. For a three-phase fixed system in a single-phase home, yes; you apply for that via mijnaansluiting.nl. Costs and lead times vary by grid operator and region.
What is the difference between single-phase and three-phase for backup power?
With single-phase backup power, only what is on that phase keeps running; with three-phase, the whole house can keep running. That is why a gateway such as the Sigen HomePro is available in both versions. A plug-in home battery only supplies backup power via its own outlet.
Ready to choose? For single-phase that you connect yourself: see the plug & play home batteries. For a fixed single-phase or three-phase system: see the fixed home batteries and the inverters, and request a quote. The full overview is under home batteries; the difference between the two routes is explained in plug-in or fixed.
Sources
- Liander, “Soorten aansluitingen” (types of connections) and “Hoofdschakelaar verplicht” (main switch required) (consulted 26 September 2026): connection capacities and 2-pole/4-pole main switch
- Liander, “Een verzwaring aanvragen” (applying for an upgrade) (consulted 26 September 2026): five steps via mijnaansluiting.nl
- Netbeheer Nederland, “Slimme meter: veelgestelde vragen” (smart meter FAQ) and DSMR P1 companion standard (consulted 26 September 2026): the smart meter records consumption and feed-in on the connection
- Marstek Netherlands, “Installatiehandleiding Marstek P1-meter, thuisbatterij & app” (installation manual for the Marstek P1 meter, home battery & app) (June 2026): three-phase sum mode, multiple units across phases
- Product data Sungrow, Sigenergy, Enphase and Marstek: manufacturer documentation and product pages on multi-solar.nl (26 September 2026)