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14.05.2026
The search for the Marstek P2500, a popular additional storage unit for balcony power plants, is increasingly met with the message that production has been discontinued. Many users are wondering why this 2.24 kWh LiFePO4 battery is no longer available and which successors are recommended. This article clarifies the background and shows suitable alternatives for balcony solar users.
Reasons for the discontinuation of the Marstek P2500
The Marstek P2500 was designed as an expansion storage for the B2500 system and offered 2,240 Wh capacity. User reports indicate recurring problems with switching between main and auxiliary storage, leading to system freezes. Marstek has abandoned separate auxiliary storage units in favor of main units with a larger PV input (e.g., B2500-D). Retailers confirm: Production of the P2500 has been discontinued, and offers refer to the successor B2500-D.
Market trends for balcony storage systems 2026
The market for balcony power storage systems is growing rapidly – driven by high electricity prices and simpler registration rules. Users prioritize models with IP65 protection, high cycle counts, and app monitoring. At DRBO Greenenergy, we rely on reliable plug-and-play storage systems – from compact extensions to 5 kWh systems with Deye inverters.
Top Alternatives to the Marstek P2500
An overview of sensible successors and alternatives:
| Model | Capacity | Special Feature | Suitable for |
|---|---|---|---|
| Marstek B2500-D (successor) | 2.24 kWh | IP65, Dual-MPPT, 800 W output, App | Balconies, tenants |
| SunEnergyXT B215 PLUS | 2.15 kWh | modular up to 8.6 kWh, immediately available | Expansion of existing systems |
| SunEnergyXT BK215 PLUS | 2.15 kWh | Head storage, modular, from €698 | Entry & Expansion |
| SunEnergyXT 500 PRO | 5 kWh | All-in-One, 2,400 W, "VERY GOOD" (ComputerBild) | Higher self-consumption |
Comparison: P2500 vs. Successors & Alternatives
| Criterion | Marstek P2500 (discontinued) | Marstek B2500-D | SunEnergyXT BK215 PLUS |
|---|---|---|---|
| Capacity | 2.24 kWh | 2.24 kWh | 2.15 kWh (modular up to 8.6) |
| IP Protection | IP65 | IP65 | IP65 |
| Zero Export | in B2500 system | yes | yes (e.g. Shelly Pro 3EM) |
| Known Issues | Switching errors | improved | controllable independently of manufacturer |
| Availability | discontinued | available | immediately available |
Technical Background
The P2500 used LiFePO4 cells; weaknesses primarily lay in the interaction of main and auxiliary storage (BMS, switching logic). Successor models integrate capacity more directly and optimize MPPT and app stability. Those who value easy expandability are well-served with a modular system like the SunEnergyXT BK215 PLUS.
Buying Guide for Balcony Storage Systems
Pay attention to compatibility with your inverter (e.g., Hoymiles or Deye), IP65 protection, and a reliable app. A modular design allows for later expansion. Find out more in our balcony power plant overview, in the comparison of the best balcony storage alternatives 2026, and in the test of the best 5 kWh storage systems.
Our Recommendation
P2500 no longer available? Here is the reliable alternative.
Instead of waiting for a discontinued auxiliary storage unit: The modular SunEnergyXT BK215 PLUS (2.15 kWh, expandable up to 8.6 kWh, from €698) and the 500 PRO (5 kWh, "VERY GOOD" by ComputerBild) are immediately available and controllable independently of the manufacturer.
View BK215 PLUS →Immediately available · modularly expandable · free consultation.
Frequently Asked Questions about the Marstek P2500 Discontinuation
Why was Marstek P2500 production discontinued?
Due to technical problems such as switching errors and high support effort; the capacity was integrated into main devices.
Is there a successor to the P2500?
Yes, the B2500-D with the same capacity and improved stability.
Is the P2500 still available?
Only rarely; retailers offer the B2500-D.
Which alternative do you recommend?
For expansion and extension, the modular SunEnergyXT BK215 PLUS / B215 PLUS, for more power the 500 PRO.
Does the alternative fit my balcony power plant?
Yes – SunEnergyXT storage units work independently of the manufacturer, zero export e.g. with the Shelly Pro 3EM.
Status: June 2026. Information based on publicly available manufacturer/retailer information, subject to change. Brand and product names belong to their respective manufacturers.
