ModuleTwo.
Your plug-in home battery.

A plug-in home battery connects to an earthed socket, so it doesn't have to be wired into your fuse box or inverter. ModuleTwo is one of these: you choose from 2.11 to 10.55 kWh of storage, and the smart control system handles charging and discharging automatically through the MyGrid Energy app.

For one 2.11 kWh base module, we estimate about 1.9 kWh for your appliances at 89% efficiency. That is around 130 smartphone charges, 90 hours for a fridge or 190 hours for a Wi-Fi router. A small split air conditioner can run for about 2.5 hours. With 10.55 kWh, those figures are five times higher. ModuleTwo supplies up to 800 W at once, so it covers part of the demand from larger appliances. These are separate examples; actual consumption and efficiency depend on the appliance and conditions.

ModuleTwo costs €999 for 2.11 kWh. A 4.22 kWh set costs €1,499 6.33 kWh costs €2,049 8.44 kWh costs €2,599 and 10.55 kWh costs €3,199 All prices include VAT, shipping, the P1 VoltBridge and the MyGrid Energy app. Already have a ModuleTwo? A separate expansion module costs €899

A fixed home battery is wired into your fuse box or inverter by an installer, and it usually delivers more power. A plug-in battery like ModuleTwo goes into an earthed socket, and you can set it up yourself. Its output is lower (up to 800 W through a regular socket), but there's no building work, the upfront cost is smaller and you can take it with you when you move.

Yes. ModuleTwo works alongside your existing inverter, and nothing changes on your solar panels. The battery is plugged into a socket and reads your smart meter through the P1 VoltBridge. That's how ModuleTwo knows when you have power left over.

An example: your panels produce 700 W and your home is using 400 W. ModuleTwo sees that roughly 300 W is going to the grid, and charges at about that rate, within the limits of the battery and your settings.

You can, but you don't have to. ModuleTwo has 4 solar inputs with a combined maximum of 2,600 W. That's the total, not per input. Panels that already have their own inverter can stay as they are: their power reaches the battery through your home's wiring. The connection ratings are in the ModuleTwo user manual (PDF).

Not for the standard setup. You plug ModuleTwo into an earthed socket that meets the guidelines in the manual, and click the P1 VoltBridge into your smart meter yourself. Unsure about your socket or circuit, or want to deliver up to 1,200 W on a dedicated circuit? Then have an electrician take a look.

• An earthed socket in a suitable spot, such as indoors, in a garage or in a storage room. It must meet the guidelines in the manual.
• A smart meter with a free P1 port. The included P1 VoltBridge reads how much power your home draws and feeds back. It only passes on meter data; the power for your devices doesn't run through the VoltBridge.
• Wi-Fi, for the MyGrid Energy app and the control system.

No smart meter, or no free P1 port? We support other meter readers too, such as Shelly devices. Email the meter type to hello@mygrid.energy. All connection requirements are in the ModuleTwo user manual (PDF).

Get in touch with us in that case. The P1 VoltBridge is the standard solution, but it isn't the only one. We also support other meter readers and dongles, such as Shelly devices, so ModuleTwo can still tell how much power your home draws and feeds back.

What's possible depends on your meter and your meter cupboard. Email the make and model of your meter to hello@mygrid.energy, ideally with a photo of the cupboard. We'll tell you which solution fits your situation, before you order.

Yes, if you have a dynamic energy contract or a day/night tariff. ModuleTwo then charges during the cheap hours and supplies that power to your home when prices are higher. Whether it pays off depends on three things: the price gap between those hours, the round-trip efficiency (89% used in calculations; up to 91% measured in tests, depending on power level and conditions) and how much usage you can shift. On a fixed tariff without solar panels, there's little to gain.

Until 31 December 2026 you can offset the solar power you feed back against the power you use (the salderingsregeling). From 1 January 2027 that scheme ends in one go. For power you feed back, you'll only get a feed-in payment from your supplier, and some suppliers charge feed-in fees (Dutch government). Every kWh you store and use later is a kWh you don't have to buy.

In Flanders the reverse-running meter has already been abolished. With a digital meter you now get only a few cents per kWh for the power you feed back, while you pay the full rate for power from the grid. So every kWh you store and use later is a kWh you don't have to buy.

There is also the capacity tariff. Since 2023, part of your grid costs is based on your monthly peak: the highest quarter-hour power you draw from the grid that month. Your bill follows the average of your twelve monthly peaks, with a floor of 2.5 kW. The rate varies by grid operator and year.

What ModuleTwo does about it: it supplies up to 800 W through a regular socket and so covers part of your peak. If your average monthly peak sits above 2.5 kW, that's worth about €40 a year. If you're already at or below the floor, flattening gains you nothing extra, because you pay the minimum either way. It also can't fully cover sustained heavy loads such as a heat pump or an EV charger.

In some cases, yes. The Dutch Tax Administration explains when you can reclaim the VAT on a home battery and which obligations come with it. Check the current rules on belastingdienst.nl or ask your adviser. All prices on this page include VAT.

Through a regular socket, ModuleTwo supplies up to 800 W to your home. On a suitable dedicated circuit, that's up to 1,200 W. Charging from the socket runs at up to 1,200 W. So the battery won't fully cover large peaks from, say, a heat pump, induction hob or EV charger; the calculator takes that limit into account.

Power cut? The separate 230 V backup outlet supplies up to 1,200 W to devices you plug straight into it, such as your fridge, router or a lamp. It doesn't power your whole home or three-phase appliances.

Not automatically. ModuleTwo delivers power on one phase. Does your smart meter net consumption and feed-in across the three phases at the same moment? Then what the battery delivers on its phase counts towards your total consumption. Whether your meter works this way depends on the meter type and your grid operator. It's about metering and netting: the battery doesn't physically supply every phase and isn't backup power for your whole home.

Yes. You start with a 2.11 kWh base module and add 2.11 kWh expansion modules later, up to 10.55 kWh in total. A separate expansion module costs €899 Expanding adds storage, not power: the charging and discharging power stays that of the base module.

That depends on your usage, your energy contract and whether you have solar panels. ModuleTwo achieved up to 91% round-trip efficiency in tests, depending on power level and conditions. The calculator on this page deliberately stays on the cautious side, assuming 89% efficiency, 330 full charge cycles a year and a maximum output of 800 W. The result is an estimate based on your own figures, not a promise.

ModuleTwo uses cobalt-free LiFePO4 (LFP) cells, chosen for their long life and thermal stability. You get a warranty of 10 years or 6,000 charge cycles, whichever comes first, under the warranty terms.

You'll see the current delivery time for your set on the product page in the shop, before you check out. Select the Netherlands as your delivery country there. Shipping is included in the price.

Yes. You can connect both the P1 VoltBridge and ModuleTwo to Home Assistant, and ModuleTwo also supports MQTT. That way you follow your energy data in your own dashboard and add ModuleTwo to your own automations. Readings travel over your home network straight to ModuleTwo; aggregated data goes to our own EU cloud, for the MyGrid Energy app.