🔋☀️ How many batteries do you really need for your balcony power plant?
Whether you are a café owner, freelancer or simply an energy-conscious city dweller – anyone who operates a balcony power plant in Germany will sooner or later ask themselves this question:
“I have 2×210 W modules – do I really need one or more Sunpura S2400 batteries?”
Let's get the facts straight: 📍 Location : Bonn, Germany 🔌 PV setup : 2×210 W = 420 W peak (balcony-optimized) 🔋 Battery : Sunpura S2400 (2.4 kWh usable capacity, all-in-one system)
☀️ What do 2×210W modules really deliver?
In Bonn, the average annual yield for balcony PV is approximately 900 kWh/kWp .
That means: 🔸 420 Wp × 900 = ~378 kWh/year 🔸 Divided over the year = ~1.0–1.2 kWh per day
➡️ So on most days you produce less than half of what an S2400 can store.
🔋 How many batteries fit?
✅ 1× Sunpura S2400 is the optimal combination.
It offers you:
• Sufficient storage for daily solar yield
• Option to recharge from the grid when needed (e.g. with dynamic tariffs)
• A clean plug & play solution – no overengineering, no waste
⛔ More than one battery? Only useful if:
• You expand your PV output to >600 W
• You work specifically with low night-time electricity tariffs
• You continuously operate powerful devices (e.g. portafilter, air conditioning)
📈 Practical tip for small businesses:
Many cafes, salons and studios use the Sunpura S2400 not only to save money – but also for operational resilience .
Coupled with 2×210 W modules, it reliably supplies the coffee machine, lights, and refrigerator during peak times – and helps avoid expensive grid peaks.
It's not about living off-grid. It's about deciding when and how you use electricity.
🔗 Learn more at www.sunpura.de. Need help with sizing? Contact us or ask your local specialist.
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