BT-NLC-Power Pack

2.4 kWh*, 24-Volt power pack

* The specified capacity refers to the recommended 50% usage for maximum lifespan. (Up to 80% usage is possible.)

The cells have a sealed, salt-resistant housing. They are position-independent and maintenance-free.

Info:
Most manufacturers specify the ampere-hour (Ah) capacity based on C100, which results in a higher capacity rating. (The C-rate indicates the number of discharge hours over which the specified ampere-hour capacity is usable.) We specify the Ah rating based on C10, as 10 hours is a more realistic value for solar storage applications!

Applications

Home energy storage systems for UPS, solar, and wind
Mobile applications: motorhomes, boats, industrial vehicles, etc.
Smart grids, grid stabilization, and microgrid systems

Discharge Characteristics at 25°C

Number of Cycles vs. Depth of Discharge

It is evident that the 2-volt NLC cell already reaches 4,800 cycles at 50% depth of discharge. Even at 70% usage, it still achieves 4,300 cycles. This is spectacular compared to conventional lead-acid batteries.

Comparable (but more expensive) OpzV (VR L) branded batteries only achieve 3,000 cycles at 50% usage and reach their calendar life limit in eleven years!

The slightly cheaper OpzS (V L) batteries only reach 2,900 cycles at 50% usage.
The unique feature of BT-NLC technology is its four-times slower sulfation process. Based on our experience since 2009, this likely results in at least twice the lifespan. We recommend 50% battery usage and provide instructions in our included manual on how to adjust your system to achieve approximately 25 years of operation. Our goal is to ensure optimal battery resource utilization, achieving the longest possible lifespan for maximum ecological and economic efficiency. In general, up to 80% usage is possible, but this halves the lifespan. Positively speaking, the lifespan curve increases exponentially with lower usage.

Further Information

To learn more about the research of the Förderverein Saubere Energie with the BT-NLC Battery, please read more here or contact us directly.

Accessories

Bridge cables for cell connection
Operating manual (German)

Payment Information

For prepayment, only a 30% deposit is required for delivery times longer than 14 days. The remaining balance is due 7 business days before shipping.

Technical Data

Specifications per Cell

Property	Value
Nominal Voltage	2 V
Lifespan at 50 % depth of discharge	4800 cycles
Capacity at C10*	200 Ah
Dimensions	L 227 x W 96 x H 291 mm, total height 303 mm
Weight	17 kg
Design lifespan at 20 °C	> 20 years
Internal Resistance	Approx. 0.55 mΩ
Short-circuit Current	3700 A
Self-discharge Rate	0.5 % / month
Temperature Range	-30 °C to +50 °C
Recommended Temperature Range	15 °C to 25 °C
Maximum Charging Current	50 A
Maximum Discharge Current	133 A
Recommended Maximum Discharge Current	67 A
Float Charge	2.23 V at 20 °C
Equalizing Charge	2.3 V at 20 °C
Connections	M8
Tightening Torque	10 Nm