SunLit B215 Balcony Power Station Storage with Expansion Storage

Jan 21, 2026

The SunLit B215 balcony power plant storage unit with expansion storage revolutionizes the use of balcony power plants by reliably storing surplus solar power and making it available around the clock. In Germany, the installed capacity of balcony power plants rose to over 1.5 GW in 2025, but up to 70 percent of the generated energy is lost without storage. DRBO Greenenergy offers this system as a practical solution to increase self-consumption to up to 90 percent and significantly reduce energy costs.

What is the current state of solar energy in Germany?

In 2025, balcony power plants reached a total capacity of 1.5 gigawatts, with over 500,000 systems in operation. Nevertheless, self-consumption without storage remains at only 30 percent, as energy produced during the day often flows into the grid. DRBO Greenenergy provides high-quality storage solutions to minimize this loss.

What are the pain points of balcony power plants without storage?

Households pay an average of 0.40 euros per kWh for grid electricity, while stored solar energy only costs 0.10 euros. Dark periods lead to dependence on expensive grid electricity, especially in winter months with up to 50 percent less solar radiation. Many tenants shy away from investments, as the break-even without storage is over five years.

Why do traditional solutions fail for balcony power plants?

Lead-acid batteries offer only 500 cycles and a discharge depth of 50 percent, in contrast to LFP technology with 8,000 cycles. Large home storage units cost from 5,000 euros and require electricians, while plug-and-play alternatives remain inefficient without app monitoring. Traditional systems are rarely expandable and not weather-resistant.

What can the SunLit B215 balcony power plant storage unit with expansion storage do?

The SunLit B215 is based on Lithium Iron Phosphate (LFP) technology with 2.15 kWh capacity per module, expandable to 8.6 kWh by adding up to three expansion storage units. Compatible with Deye SUN-M, APsystems EZ1-M, and Hoymiles inverters, it integrates MPPT trackers for up to 1,920 watts of output power. IP65 protection allows for outdoor use, an integrated heating function ensures operation at -20 °C, and the smartphone app enables real-time monitoring and zero export via Shelly 3EM.

What is the advantage of comparing traditional vs. SunLit B215?

Criterion	Traditional Solution (e.g., Lead-Acid)	SunLit B215 with Expansion Storage
Capacity (max.)	2 kWh, not expandable	8.6 kWh, modular
Charge cycles	500	8,000
Depth of discharge	50%	100%
Installation	Electrician required (2 hours)	Plug-and-play (15 minutes)
App control	No	Yes, with real-time data
Price per kWh (start)	0.50 Euro	0.30 Euro
Outdoor suitability	No (IP20)	Yes (IP65, heating)

How do I install the SunLit B215 step by step?

Step 1: Connect balcony power plant to Schuko socket and stack expansion storage units – connect base station to head storage.
Step 2: Plug PV modules (up to 4 per unit) into MPPT inputs, download the app, and connect to WiFi.
Step 3: Set priorities (self-consumption, zero export), optionally integrate Shelly 3EM for grid monitoring.
Step 4: Start the system – first charge in 3 hours at 800 watts PV power.
Step 5: Check app data monthly and expand if necessary.

Who benefits as a tenant with high evening consumption?

Problem: 2 kWh grid electricity in the evening at 0.40 Euro/kWh, solar production during the day unused.
Traditional: Surplus to the grid, EEG levy only 8 cents/kWh.
After SunLit B215: 1.8 kWh stored, 90 percent self-consumption.
Benefit: 720 Euro/year savings, amortization in 2.5 years.

When is the storage suitable for families with an electric car?

Problem: 10 kWh daily consumption, charging at night is expensive.
Traditional: External charging station, 5 Euro/day.
After SunLit B215 + expansion: 6 kWh stored, car charges with solar power.
Benefit: 1,500 Euro/year saved, CO2 savings of 1 ton.

Why does the storage help offices with office power peaks?

Problem: 3 kWh midday surplus, afternoon peaks of 4 kWh.
Traditional: Grid consumption, 1,200 Euro/month.
After SunLit B215: Complete shift, 85 percent autonomy.
Benefit: 14,000 Euro/year savings, scalable to 8.6 kWh.

Where does a senior household save with winter consumption?

Problem: Heating and lighting in dark periods 2.5 kWh/day.
Traditional: 100 percent grid power.
After SunLit B215: Heating function keeps battery active at -10 °C, 70 percent self-consumption.
Benefit: 400 Euro/year saved, maintenance-free for 10 years.

How will the market for balcony storage develop by 2030?

By 2030, 10 million balcony power plants are expected to be in operation, with the storage share rising to 60 percent. DRBO Greenenergy is driving this forward, focusing on modular systems like SunLit B215. Investing now ensures a 20 percent higher return due to rising electricity prices.

What is the best time to get started?

DRBO Greenenergy positions itself as a partner for the decentralized energy transition, supplying hardware stores and private customers with SunLit solutions. The combination of quality and expandability makes the B215 future-proof.

FAQ

What is the maximum capacity of the SunLit B215?
Up to 8.6 kWh by stacking four modules (1 head storage + 3 extensions).

Is the SunLit B215 weather-resistant?
Yes, IP65 protection and integrated heating function allow outdoor operation at -20 to +55 °C.

Which inverters are compatible?
Deye SUN-M, APsystems EZ1-M, Hoymiles, and others via MC4 connector.

How long is the amortization period?
With 3,000 kWh/year savings and 1,200 Euro investment: 2-3 years.

Can I expand the storage later?
Yes, modular plug connections allow for easy expansion without tools.

Do I need an electrician for installation?
No, plug-and-play with Schuko plug, commissioning in 15 minutes.

Sources

Some of the information in this article is taken from the Internet. Product specifications may be updated at any time. For the latest information, please visit the official website or product page.