Battery for your existing Solar-System
Already have a photovoltaic system installed without battery?
With a battery storage system, you get more out of your solar installation. Instead of sending unused energy back to the grid for little return, you can store it and use it in the evening, at night, or on cloudy days.
This means: more self-consumption, lower electricity bills, and less dependence on the public grid.A battery can keep the lights on during a power outage.
Upgrading with a battery is a smart, future-proof investment that makes your solar system more efficient and independent.
Next steps
What are my next steps?
Step 1
Request a free consultation
Tell us a bit more about your home and energy needs, during a short on-site visit, so we can assess your installation conditions accurately.
Step 2
System check
We assess your current solar setup and energy usage to recommend the ideal battery size and technology for your needs.
Step 3
Custom battery upgrade plan
Our experts design a solution that fits seamlessly with your existing inverter and panels.
Step 4
Receive your offer
You get a clear and transparent proposal from joule, including any eligible subsidies.
Step 5
Installation by certified professionals
Our certified technicians install and configure your new battery system, ensuring smooth integration and optimal performance.
Step 6
Enjoy more self-consumption
Your system now stores excess solar power during the day, so you can use it in the evening or during outages. This increases independence and reduces electricity bills.
Why should upgrade my existing Solar-System with Joule?
Choosing the right partner for your battery upgrade is key.
Joule is local and we know the Luxembourg market
As a Luxembourg-based company, joule understand the local regulations, grid requirements, and subsidy programs. We speak your language.
In-house quality, trusted partners
All electrical and system works are carried out by our own trained technicians.
Safety is non-negotiable
We follow strict safety protocols, to protect your property, our team, and your investment. Quality and safety go hand in hand.
Simple process, fast results
From first contact to final activation, we handle the entire process, transparently and efficiently.