Retrofitting a Balcony Power Plant with Storage: How to make your existing system fit for the night.

Do you already have a balcony power plant, produce solar power during the day, but don't use it at night? Upgrading with a storage unit turns your system into an all-round efficient energy management system. This way, you store surplus electricity and become more independent from the grid.

Why retrofitting a balcony power plant storage unit makes sense

Balcony power plants with storage increase self-consumption from often only 30 percent to up to 70 percent. According to Federal Network Agency data, plug-and-play systems are growing strongly, as tenants can easily retrofit them. The market for retrofitting balcony power storage units is booming, with over 500,000 new systems annually in Germany.

In times of high electricity prices, users save up to 300 euros per year with storage units. Households with high night-time consumption, such as refrigerators or stand-by devices, particularly benefit from retrofitting balcony power plant storage units.

Market trends for retrofitting balcony power plant storage units

The trend towards modular storage units such as AC-coupled systems dominates in 2026. According to Fraunhofer ISE, demand for LFP batteries will increase by 40 percent, as they are safer and more durable. Retrofitting balcony power plant storage units is made easier by new VDE standards, which allow up to 800 watts of discharge power.

At DRBO Greenenergy, we pursue a clear goal: to advance the decentralized energy transition together with our customers. We already supply numerous hardware stores, specialist retailers, and installation companies with high-quality solar and energy storage solutions and now also support private customers with customized services for tenants and homeowners.

Over 60 percent of users choose expandable storage for future needs. Long-tail trends such as retrofitting 800W balcony power plant storage units or expanding balcony PV storage units show increasing search volumes.

Top products for retrofitting balcony power plant storage units

Here are proven storage solutions compatible with common micro inverters.

These Sunlit Solar models are available on drbogreeninergy.com and store-charge.com. They are compatible with APsystems, Deye, and Hoymiles inverters.

Competitive comparison of balcony power plant storage units

Compare key features for retrofitting.

Sunlit series impress with modularity and cost-efficiency when retrofitting balcony power plant storage units.

Core technology behind storage units

LFP batteries offer 100 percent DoD and minimal fire risks. The PV hub in the Sunlit BK215 automatically regulates charging from solar surplus. Efficiency decreases slightly at low load but remains at 83 percent at 800 W.

App integration allows real-time monitoring and dynamic feed-in. Bidirectional models like the EV3600 charge from the grid at favorable tariffs.

Installation: Step-by-step guide

Safely retrofit your balcony power plant storage unit.

1. Check compatibility with your inverter (Deye, APsystems).

2. Disconnect the system from the grid.

3. Connect MC4 cables between modules and PV hub.

4. Connect Schuko plug to the grid, ensuring proper grounding.

5. Configure via Bluetooth app: Set feed-in to 600-800 W.

6. Test charging cycles in a shade-free location.

No electrician knowledge necessary, but comply with VDE 0126-95. IP65 protection allows outdoor installation.

Real use cases and ROI

A tenant in Berlin retrofitted a 600W balcony power plant with Sunlit BK215: self-consumption increased from 35 to 68 percent, annual savings 280 Euros. Amortization in 2.5 years at 0.35 Euros per kWh.

A family household in Munich uses EV3600 bidirectionally: 450 Euros saved through EV charging. ROI at 25 percent through subsidies like KfW.

Buyer's guide for your storage unit

Choose capacity according to consumption: 2 kWh for singles, 5 kWh for families. Pay attention to app control and winter suitability. Retrofitting balcony power plant storage is worthwhile for annual production exceeding 2000 kWh.

Future trends in storage retrofitting

By 2028, market researcher GTM Research predicts 1 million retrofits. Home Assistant integration and grid charging at dynamic prices will become standard. Expandable systems like Sunlit will dominate.

Frequently asked questions about retrofitting balcony power plant storage units

Is an electrical permit necessary?
No, plug & play models up to 800 VA are tenant-friendly without notification.

Which inverters are compatible?
Deye, APsystems, Hoymiles up to 80 V starting voltage.

How long does the storage unit last?
LFP cells up to 10-15 years with 8000 cycles.

Can I retrofit outdoors?
Yes, IP65 models withstand rain and cold down to -20 degrees Celsius.

Is retrofitting a balcony power plant storage unit financially worthwhile?
Yes, with 300 Euros annual savings and 2-3 years amortization.

Sources

• Federal Network Agency: Balcony Power Plant Statistics 2026

• Fraunhofer ISE: Battery Trends LFP Storage

• DRBO Greenenergy: Product pages for Sunlit BK215, EV3600, B215

• Trustpilot: Customer reviews DRBO Greenenergy

• VDE standards: 0126-95 for Plug & Play

• Store-charge.com: Sunlit specifications

• Sunlitsolar.de: Compatibility lists

Some of the information in this article comes from the internet. Product specifications can be updated at any time. For the latest information, please visit the official website or product page.