ROI Calculator

Stop Guessing. Start Calculating Your Energy Independence.

European electricity prices are unpredictable. Use our real-time calculator to discover exactly how much you can save annually.

Tailored to your location

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Balcony Solar PV ROI Calculator
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Get My System & Start Saving

The Grid Takes Your Profit

❌ Sell daytime solar to the grid for pennies. 

❌ Buy it back at peak evening rates. 

📉 Result: ~30% Self-Consumption (Low ROI)

Lock In Your Savings

✅ Automatically store 100% of daytime solar. 

✅ Power your evening appliances for free. 

📈 Result: >80% Zelfconsumptie (Maximized ROI)

09:00 - 15:00 

Capture & Power

Power your home essentials instantly. 

 

Send excess energy directly to the battery.

15:00 - 18:00

Store for the Evening

Battery hits 100% capacity.

 

 Free energy safely locked in.

 

18:00 - 23:00

Bypass Expensive Rates

Auto-switch to battery as grid prices surge.

 

Run evening appliances for €0.

Turn your balcony into a 24/7 personal power plant.

Shop your Plan

Sonnex Solar Hub - H1600M

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Essential Skincare Set

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42 Reviews
€100.000,00

Free Oil + Free USA Shipping
The Smart Hacker

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Complete Skincare Set

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122 Reviews
€1.999,00

Free Oil + Free USA Shipping
The Absolute Pro

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Ultimate Skincare Set

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54 Reviews
€0,00

Free Oil + Free USA Shipping

Sarah

35 years old

I used to skip lunch almost every day between meetings, which left me drained and unfocused. GemPrep’d completely changed that. The meals are balanced, fresh, and ready in minutes — no prep, no cleanup. I feel full longer and more energized throughout the afternoon. It’s amazing how much better my days are by eating real food. 

Busy Schedule

Low Energy

Poor Habits

David

40 years old

Running a business made healthy eating impossible for me — I lived on snacks and coffee. GemPrep’d solved that instantly. Every meal tastes homemade and keeps me focused for hours. I don’t waste time thinking about food anymore; I just heat, eat, and move on. I’ve never felt this consistent with my diet or productivity before.

Lack of Time

Low Energy

Peak State

Emma

29 years old

I’ve tried countless healthy meal brands, but none felt truly satisfying. GemPrep’d meals are delicious, filling, and perfectly portioned — no fake flavors or preservatives. I finally enjoy eating healthy again, and it shows in my energy and focus. It’s become the easiest part of my routine, and I honestly don’t miss cooking at all.

Healthy Eating

Food Guilt

Gain Weight

Your Balcony. Your Energy. Zero Hassle.

Designed for Dutch apartments. No electricians, no drilling, and completely landlord-friendly.

Do I need VvE (Homeowners Association) approval to install this?

In most cases, no. Our Sonnex balcony systems are designed as temporary, plug-and-play appliances. Because they require zero drilling and do not alter the building's structure, they generally bypass complex VvE regulations. However, we always recommend double-checking your specific building rules.

I am renting my apartment. Can I take it with me if I move?

Absolutely. The system is 100% landlord-friendly. There is no permanent installation or hardwiring. If you move to a new apartment, you can unmount the panels and pack up the battery in under 15 minutes. It’s an investment that moves with you.

The Netherlands gets a lot of rain and wind. Is it safe and efficient?

Yes. Our solar panels feature advanced low-light technology to ensure steady energy generation even on cloudy Dutch days. Furthermore, the customized mounting brackets are rigorously tested to withstand strong coastal winds, keeping your system locked securely to your balcony railing.

Will it work with my Dutch smart meter (slimme meter)?

Seamlessly. Simply plug the system into any standard European wall socket (Schuko). Your home network will instantly prioritize the free solar energy over grid electricity. Your smart meter will automatically reflect the drop in grid consumption.