Rethinking Tenant Electricity: SunLit & Laudeley
Betriebstechnik Set New Standards
SunLit Solar and Laudeley Betriebstechnik have implemented a flagship energy transition project in Hamburg-Ohlsdorf with the use of SunLit products such as our SunLit Main Power Station Unit BK215 and Extension Power Station Unit B215: The first 32 tenant households are now benefiting from collective rooftop solar power — without any investment costs.
LAUDELEY: UNBÜROKRATISCHER MIETERSTROM - DIE BLAUPAUSE
A Revolution in Tenant
Electricity:
Collective Balcony
Power Plants
Traditional tenant electricity projects have often been seen as technically complex, administratively burdensome, and economically unappealing. However, the pilot project by Christian Warsch and Holger Laudeley proves that it can be different: simple, cooperative, and efficient. The key to success? A combination of modern technology, pragmatic implementation, and an innovative financing model.
The Project in Hamburg-Ohlsdorf: A Pioneer for the Energy Transition
Located in Hamburg-Ohlsdorf, near the world’s largest park cemetery, stands the first building equipped with "Collective Balcony Power Plants." The two interconnected buildings with 32 apartments offer ideal conditions: freshly renovated roofs, insulated gable walls, and smart infrastructure that routes cables through internal emergency shafts directly to the basement.
Key Facts at a Glance:
32 apartments
872 m² of roof space
32 mini solar systems, consisting of four solar modules each
32 SunLit solar power storage sets consisting of 1x SunLit Main Power Storage Unit BK215 plus 1x SunLit Extension Power Storage Unit B215 each
In addition, two large systems have been installed:
1. Full-Feed-In System with 54 modules to refinance investment costs
2. General Electricity System with 54 modules, battery storage, and inverters to cover communal electricity needs and to further refinance investment costs
Inspiring Tenant Electricity Technology: SunLit as a Partner for Innovative Solutions
The technical implementation of the 32 collective balcony power plants relies on the quality and efficiency of SunLit components:
- Solar Modules: 4x 440 watts peak solar modules
- Storage Solutions: 1x SunLit BK215 and 1x SunLit B215 with a total storage capacity of 4.3 kWh
- Micro-Inverters: 2x Deye SUN-M80G4 (800 watts output each)
- Smart Power Consumption Meter: Shelly Pro 3 EM
Additionally, the SunLit-App allows to monitor the solar power production and usage in real time. Transparency builds trust — and inspires enthusiasm for the energy transition.
Learn more
Financial Benefits: Cooperative and Sustainable
Dr.-Ing Christian Warsch, the landlord covering the approximately €280,000 investment cost, has developed a unique financing model:
Roof Lease:
Tenants contribute 50% of their achieved savings.
Feed-In Tariff:
This remains with the tenants.
General Electricity:
Costs are entirely eliminated for tenants due to the general electricity system.
For example, in a 69 m² apartment, the estimated savings amount to around €280 per year.
Advantages at a Glance
For Tenants:
Reduced electricity costs (by approximately 40–55%) No costs for general electricity Retention of the feed-in tariff Access to affordable EV charging (20 cents/kWh) Simple and active participation in the energy transition without investment costs or risks Improved solar power output thanks to roof installation of the balcony power plantsFor Landlords:
Refinancing of investment costs through feed-in tariffs and roof leasing Tax depreciation opportunities Simplified billing and reduction of bureaucratic hurdles Consistent and visually appealing solution thanks to roof installation of the balcony power plants Increased attractiveness of the apartments Strengthening the sense of communityVideos
LAUDELEY: UNBÜROKRATISCHER MIETERSTROM - DIE BLAUPAUSE
LAUDELEY: MIETERSTROM FÜR ALLE - DAS KONZEPT
German Press
A Model for the Future
The Hamburg-Ohlsdorf project demonstrates that collective solar power for tenants is not just a vision but can be a lived reality. Positive feedback from politicians, associations, and tenant protection organizations confirms that this concept has the potential to set a precedent across Germany.
By 2025, the model is set to expand to additional buildings. “Our goal is to make the energy transition tangible — for everyone,” emphasize Warsch and Laudeley.
SunLit is proud to be part of this landmark project and to make a decisive contribution to decentralized energy supply. Together, we are creating a sustainable future!
Would you like to find out more? Request detailed information on our unique tenant electricity project & the detailed project handout now free of charge.
