Comparing the Sunlit Solar BK215 and B215 Units Choosing the Right Solution for Your Balcony Power System
Overview of the Sunlit Solar BK215 and B215 Units
The Sunlit Solar BK215 is the brain of the system, managing all energy functions. It has all the outputs, monitoring, and a Battery Management System (BMS) to control energy flow, manage storage capacity, and track system performance. The BK215 is essential because it manages the entire setup.
The B215 acts as an expansion module for the BK215, adding extra storage capacity. You can connect additional solar panels to the B215, increasing both input and total storage for the system. However, the B215 doesn’t have its own output and depends on the BK215 for energy discharge and control.
Key Differences between the BK215 and B215 Units
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Feature
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Sunlit BK215
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Sunlit B215
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Function
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Head unit with energy management and outputs for power discharge
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Expansion unit that adds storage capacity to the BK215
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Storage Capacity
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2.15 kWh
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2.15 kWh (adds capacity when paired with BK215)
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PV Inputs
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2 inputs (supports up to 800 W each) for up to 4 panels
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2 additional inputs (supports up to 800 W each) for up to 2 panels
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Outputs
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2 outputs (combined max output of 1,920 W)
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No outputs – energy management via BK215
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Battery Management
System (BMS)
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Yes, with integrated heating for operation down to -20°C
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Yes, with similar heating and protective functions
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LCD Display
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Yes, shows input/output power, capacity, and connectivity
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No display
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Connectivity
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Wi-Fi and Bluetooth for monitoring and updates
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None
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System Expansion
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Acts as the main unit; supports up to 3 B215 expansions
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Expands system with each module adding 2.15 kWh capacity
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Compatibility
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Required for all setups
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Optional, add capacity when connected to BK215
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Maximum Storage Capacity
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Up to 8.6 kWh (with 3 B215 expansions)
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2.15 kWh per unit, scalable with additional B215 units
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Features and Benefits
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Energy Storage and Management The BK215 includes 2.15 kWh of built-in storage, which is ideal for most balcony setups. If you need more storage, each B215 expansion module adds capacity, allowing up to 8.6 kWh total storage with three B215 modules. This modular setup is perfect for users looking to start small and gradually expand their energy storage over time.
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Battery Management System (BMS) Both the BK215 and B215 feature a high-quality Battery Management System (BMS) for safe operation. The BMS provides overcharge, over-discharge, and short-circuit protection, which extends battery life. It also includes a heating function for use in temperatures as low as -20°C, making it ideal for outdoor applications.
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Inputs and Outputs The BK215 supports up to four solar panels, each with a 400 W capacity, maximizing your energy intake. The B215 modules also have PV inputs but allow for only two additional panels each. The B215 doesn’t have independent outputs; instead, it relies on the BK215 to handle power distribution and discharge.
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LCD Display and Connectivity A key feature of the BK215 is its built-in LCD display, providing real-time data on input/output power, storage capacity, and connectivity. This display helps users monitor system performance easily. The BK215 also supports Wi-Fi and Bluetooth, enabling remote monitoring and updates via a mobile app. The B215 lacks display and connectivity features, as it’s intended solely as a supplementary module.
Use Cases and Recommendations
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For Single-System Users: If you're setting up a basic balcony solar system, the BK215 alone may be enough. It provides ample storage and output capabilities for small-scale energy needs, along with monitoring and connectivity features for convenient system management.
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For Expanding Systems: If you expect your energy needs to grow, the BK215 can be paired with one or more B215 units. Each B215 module adds storage capacity, making it a great option for users who want to expand their energy storage over time without replacing their entire system.
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Cold-Weather Applications: Both units are ideal for colder climates, thanks to the integrated heating function in their BMS. This feature prevents performance drops in low temperatures, ensuring reliable operation even in cold weather.
Conclusion
