
Already have paneles solares but considering ampliación? A batería doméstica is often smarter than extra panels. Learn when a battery is the better choice.
Your paneles solares produce electricity during the day, but you use most of that electricity in the evening. The result: a large portion of your generated energy goes to the grid, at a low tarifa de inyección. The question then becomes: do you expand your installation with more panels, or add a battery?
In most cases, a battery is smarter than extra panels. More panels increase your production, but don't solve the timing problem. A battery stores the surplus you've already produced for use when you need it.
Extra paneles solares are worthwhile if your production is significantly lower than your consumption. If you produce less than 60% of your annual consumption, expanding the installation is recommended before adding a battery.
The choice of battery depends on compatibility with your existing inversor. There are three coupling principles: AC coupling (plug-and-play, works with any installation), DC coupling (more efficient, requires replacement or upgrade of inversor) and an all-in-one hybrid system.
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| Coupling type | Efficiency | Inversor required | Advantage |
|---|---|---|---|
| AC coupling (plug-and-play) | 90-92% | None (works with any inversor) | Simple, flexible, portable |
| DC coupling | 95-97% | Hybrid inversor required | Higher efficiency, less conversion loss |
| All-in-one hybrid | 95-97% | Built-in hybrid inversor | Most efficient, single component |
A DC-coupled battery is more efficient because the electricity is only converted once. However, it requires a hybrid inversor. If your existing inversor is due for replacement or if you're starting a new installation, DC coupling is the recommendation.
An AC-coupled system such as the Anker Solarbank works with any existing installation. Convenient and straightforward, but slightly less efficient because the electricity is converted twice. For existing installations, this is often the most practical choice.
Check whether your current inversor has a DC battery input. If so, you can often add a battery without replacing the inversor. If not, there are two options: an AC-coupled plug-and-play battery, or replacing the inversor with a hybrid version.
Most modern hybrid inversors (Huawei SUN2000, SolarEdge, GoodWe) support direct connection of high-voltage batteries. Check the battery manufacturer's compatibility list or ask our specialists for advice.
Step 1: measure your autoconsumo percentage. Step 2: calculate the storage potential (daily surplus). Step 3: choose a capacidad de la batería equal to 60-80% of your daily surplus. Step 4: check inversor compatibility. Step 5: install and optimise via the app.
Adding a batería doméstica to an existing panel solar installation is in most cases the best way to get more value from your current investment. You solve the timing problem without increasing the total panel area.
Request a personal consultation. Our specialists analyse your existing installation and recommend the system with the best payback period for your situation.
We analyse your installation and recommend the best battery solution.
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