On Monday morning, March 2, 2026, the European gas price jumped by over 25% at market opening. Read the update. That might sound like "something for later," but in practice, it quickly affects rates and creates uncertainty. ACM explains how energy tariffs work. Many households mainly notice it when they don't have solar power: cooking in the evening, hot water, TV, running a washing machine.
It’s particularly frustrating if you already have solar panels. During the day, you feed power back into the grid, but later in the day, you buy electricity again—precisely when it might be more expensive. Then you automatically start looking for solutions like a 20 kWh home battery or a battery with a solar panel. The goal is simple: use more of your own electricity and be less dependent on a market that can turn on its head in a single morning.
What does a "20 kWh home battery" mean in practice?
20 kWh is large—but not logical for everyone
20 kWh sounds like "being safe," but it's not always the smartest first step. kWh is not power, but energy: how much electricity you can store for later use. If your evening consumption is mainly basic (lights, refrigerator, Wi-Fi, TV), then 20 kWh might be more than you need daily. However, if you have a heat pump, electric boiler, or (regularly) charge an EV, a larger buffer might be suitable.
What's often overlooked is that your gain isn't in "maximizing storage," but in "matching well" with your consumption pattern. A battery that's too large can take longer to go from "empty to full" and thus operate optimally less often. So, first consider your goal: covering evening consumption, limiting export, or flexibly responding to price differences.
Choosing the right size based on evening consumption + solar power surplus
You choose the right capacity by comparing two things: (1) how much solar power you have left over during the day, and (2) how much you consume in the evening and at night. A simple approach: check your smart meter/app for a week and note your consumption between 5 PM and 11 PM. This "evening block" is often where a battery provides the most benefit.
Then look at your surplus: how many kWh do you feed back into the grid on sunny days? If there is a surplus, but you still buy electricity in the evening, then storage makes sense. If you have dynamic tariffs, timing becomes even more important: charging when it's cheap and using when it's more expensive. ConsuWijzer explains dynamic tariffs. No guarantees, but a clear strategy: less peak purchasing, more self-management.
Plug-in batteries vs. fixed home battery: what suits your home?
When are plug-in batteries smart?
Plug-in batteries are interesting if you want to start quickly without major renovations. You essentially get a smart solar power bank for your home: you capture surplus and use it later. This suits people who "want to experience first" what storage does, or who don't want the hassle of heavy installations.
A plug-in solution is also useful if your situation is still changing: you're moving soon, you'll expand solar panels later, or you want to scale up step by step. You start with one system and see what it does for your evening consumption. Important: pay attention to safety and how the system interacts with your meter box and smart meter.
When do you choose fixed/3-phase systems?
A fixed home battery is often more logical if you want to cover high power demands, have many simultaneous consumers, or if your installation really needs to function as the "heart of the home." Think of situations with heavy kitchen appliances, a frequently running heat pump, or a house where multiple people use a lot of electricity at the same time.
Also, if you specifically want to work on 3-phase power or need more complex integration, you'll lean towards a fixed installation. At the same time, "fixed" doesn't necessarily mean "gigantic." Many households benefit more from a system that effectively manages self-consumption than from enormous capacity. The smart route is often: first insights, then a solution that grows with your needs.
Sunpura S2400 as a smart solar power bank: how it works
The basics: LiFePO4, 2.4 kWh per module, high cycles
The Sunpura S2400 uses LiFePO4 technology. Each module provides 2.4 kWh of storage, and you can use up to 90% of the energy thanks to a DOD of 90%. The battery is designed for up to 8000 cycles (up to 70% SOH at 1.0C), which translates to years of intensive use with normal energy behavior.
Practically, this means you think in blocks of 2.4 kWh and scale to your situation. Instead of "all or nothing," you can build up storage based on your actual evening consumption. This also makes it easier to go from "I want 20 kWh" to "this is what my house really needs."
Power and robustness: up to 2400W, peak 3600W (5s), IP65
Capacity tells you how much energy you have, but power determines what you can run simultaneously. The S2400 delivers up to 2400W continuously and can briefly peak at 3600W for 5 seconds. This helps with short start-up peaks, for example, when an appliance temporarily requires extra power.
The construction is also designed for "real use": IP65 and an operating temperature of -20°C to 55°C. This provides more freedom in where you place the system, as long as the connection is made safely and your installation complies with local requirements.
Smart meter & P1 port: managing self-consumption and dynamic tariffs
A battery only becomes truly interesting when it knows what your home is doing at that moment. With smart metering (such as via a P1 connection), the battery can automatically charge when you have a surplus and discharge when your home demands power. Netbeheer Nederland on the P1 port.
With dynamic energy prices, this helps even more: you can buy less electricity during expensive hours and use your own storage more often. It's not a trick that always guarantees profit, but it does make your energy behavior smarter and more predictable—especially during periods when prices fluctuate rapidly.
- • Retrofit Solution: Works directly with your existing solar panels.
- • Capacity: 2.4kWh base module (modularly expandable).
- • Smart Meter Connection: Real-time P1 port control for maximum efficiency.
- • Plug & Play Installation: No complex inverter replacement needed.
- • Savings: More self-consumption with dynamic energy prices and less grid dependency.
- • Safety: LiFePO4 cells and battery management system (BMS).
Saving when energy is expensive: self-consumption, feed-in costs, and flexibility
Solar panels give many people the feeling of "free electricity," but timing determines whether it actually becomes cheap. You often generate the most power during the day, while consuming the most in the evening. Milieu Centraal explains why this is the case. Without storage, you feed power back into the grid and then buy it again later. If feeding back becomes less attractive or involves costs, that mismatch feels even stronger.
A home battery reverses this: you try to increase your self-consumption. This means less feed-in and more self-use at times when electricity feels more expensive. With smart control, you can also be more flexible: you adjust your strategy based on seasons, family situation, and contract type. The core is simple: less peak purchasing, more control over your evening hours.
From desire (20 kWh) to a smart roadmap: building step by step
Start small, measure, and scale up where it truly pays off
If you're thinking, "I want a 20 kWh home battery right now," make it easy on yourself: start by measuring. Look at your evening consumption, your feed-in on sunny days, and your largest consumers. Then choose storage that solves your main pain points: expensive evening hours and inconvenient feed-in times.
With a modular approach (like 2.4 kWh blocks), you can experience what happens step by step: how often is your battery empty before the evening ends? How many kWh less went back into the grid? These answers determine your actual size. Only then does "bigger" make sense.
Practical checklist before you buy
- Goal: do you primarily want to cover evening consumption, limit feed-in, or respond to dynamic prices?
- Consumption: how many kWh do you use on average between 5 PM and 11 PM?
- Generation: how many kWh do you feed back on sunny days?
- Power: what devices do you want to run simultaneously, and how often do you have peaks?
- P1/smart meter: do you want real-time control over consumption and feed-in?
Frequently Asked Questions (FAQ)
Call to action: View Sunpura S2400 and calculate your situation
Today's gas price hike is mainly a reminder: energy can become expensive and unpredictable again in a short time. You cannot control that, but you can determine how dependent you are on the grid. With solar panels and smart storage, you make your evening hours calmer: less purchasing, more of your own electricity. Vereniging Eigen Huis on home batteries.
Want to start practically? Begin with one clear goal (evening consumption, less feed-in, or smart response to dynamic energy prices), measure your consumption, and choose storage that immediately makes a difference. The Sunpura S2400 is a plug-and-play solution with 2.4 kWh per module, up to 2400W continuous power, IP65, and smart control via app and measurement data.
