Expanding Your Batteria Domestica: Adding More Capacità

Why would you expand your batteria domestica?

You purchased a batteria domestica and are pleased with the savings. But your consumption is growing: perhaps you've bought an auto elettrica, had a pompa di calore installed, or your family has grown. The surplus energia solare you produce during the day no longer fits in your current batteria.

In that situation, you don't need to replace your entire system. Many batteria domestica brands offer modulare expansion: you simply add extra modulo batterias to your existing system. Faster, cheaper, and less wasteful.

Modulare vs non-modulare

Not all batterie domestiche are espandibile. The difference lies in the system design:

Modulare systems (espandibile)

With a modulare system, you can add extra modulo batterias to your existing setup. The inverter and BMS support multiple modules. This is by far the most popular and cost-effective approach. Examples: Anker SOLIX Solarbank 2 (up to 4 modules, max 9.6 kWh), Dyness Tower (stackable up to 20 kWh), Pylontech Force H3 (up to 6 modules, max 17.5 kWh).

Non-modulare systems

Some systems are not espandibile. They consist of a single fixed unit with a predetermined capacità. If you want more capacità, you need to add a second system in parallel or replace the existing system. This is more expensive and complex.

Expansion options by brand

Here's an overview of the expansion options for the brands that HES sells:

Most expansions are relatively straightforward: with plug & play systems you can do it yourself, while permanently wired systems require a short visit from an installatore.

When does expanding make sense?

Expansion is worthwhile in these situations:

• Your batteria is fully charged daily: surplus is still being lost to the grid
• You've purchased an EV: the extra 2,000-4,000 kWh/year demands more storage capacità
• You've added more pannelli solari: more production = more surplus = more storage needed
• You've switched to a contratto dinamico: more capacità = more price arbitrage = more savings
• Alimentazione di riserva needs: you want to be independent for longer during interruzione di correntes

Cost of expansion

Expanding is generalmente cheaper per kWh than the initial purchase, because you reuse the existing inverter, wiring, and installazione. You only pay for the extra modulo batteria(s).

An extra module for the Anker SOLIX Solarbank 2 costs circa €499-€699 (1.6 kWh per module). For the Dyness Tower, an extra module is around €1,500-€2,000 (5.12 kWh). The cost per kWh when expanding is tipicamente 20-30% lower than the initial purchase.

Tips for a smooth expansion

Keep the following in mind when expanding your system:

• Check the firmware: ensure your existing system is running the latest firmware before expanding
• Matching batteria version: with some brands, the modules must be from the same product generation
• Inverter capacità: check whether your inverter can handle the additional capacità
• Contact HES: we check compatibility and advise the best expansion option

Conclusione

Expanding your batteria domestica is a smart and cost-effective way to increase your storage capacità. With modulare systems from brands like Anker SOLIX, Dyness, and Pylontech, you can easily add extra capacità — without replacing your entire system.

Considering an expansion? Request advice and we'll check the options for your system, or browse our expansion modules in the shop.