EDLC 300F/2.7V
Jianghai EDLC supercapacitor, 300F/2.7V, cylindrical, high power density, long cycle life.
Product Overview
Description
Jianghai EDLC 300F/2.7V is an electric double layer supercapacitor using activated carbon electrodes and organic electrolyte, featuring ultra-high power density and ultra-long cycle life. Cylindrical aluminum case, size 35mm (diameter) x 60mm (height).
Product rated voltage 2.7V, nominal capacitance 300F, ESR approximately 3.5mOhm, max peak current up to 200A, leakage current approximately 0.5mA. Cycle life over 500,000 cycles (25C), operating temperature range -40C to +65C, power density up to 8kW/kg.
Widely used in smart meter power-fail protection, rail transit energy recovery, crane potential energy recovery, automotive start-stop systems. Compared to batteries, supercapacitors have fast charge/discharge speed, long cycle life, wide temperature range, and maintenance-free advantages.
Product Series
EDLC
Primary Application
Supercapacitors
Key Features
- High efficiency and reliability
- Optimized for industrial applications
- Comprehensive technical support
- Available from stock
Specifications
Applications
Motor Drives
Variable frequency drives and servo motor controls
Power Supplies
SMPS, UPS, and industrial power systems
Renewable Energy
Solar inverters and wind turbine converters
EV Charging
Electric vehicle charging stations
FAE Expert Insights
"EDLC 300F/2.7V is Jianghai's main specification, performing excellently in smart meters and industrial applications. 300F capacitance can support meters working 2-3 minutes after power failure to complete data saving. Recommend configuring balancing circuits when using in series to prevent overvoltage damage. Note that supercapacitors have relatively fast self-discharge, not suitable for long-term energy storage applications."
500,000 cycle life, 200A peak current, suitable for high-power pulse applications
— Jianghai FAE Team, BeiLuo
Frequently Asked Questions
How do I calculate the backup time for EDLC 300F/2.7V in my application?
Backup time calculation for supercapacitors uses the formula: t = C x (V_max^2 - V_min^2) / (2 x P), where C is capacitance (300F), V_max is starting voltage (2.7V), V_min is minimum operating voltage, and P is power consumption. For example, with 5V system using 2 cells in series (5.4V), minimum 3.0V, and 100mA at 5V (0.5W): t = 300 x (5.4^2 - 3.0^2) / (2 x 0.5) = 300 x (29.16 - 9) / 1 = 6048 seconds (about 100 minutes). For constant current discharge: t = C x (V_max - V_min) / I.
Use our supercapacitor sizing calculator or contact FAE for precise backup time calculations based on your specific load profile.
Why is cell balancing necessary when using EDLC 300F/2.7V in series?
Cell balancing is essential for series-connected supercapacitors because: 1) Capacitance and leakage current variations between cells cause voltage imbalance during charging; 2) Without balancing, one cell may exceed its 2.7V rated voltage while others are undercharged; 3) Overvoltage damages the supercapacitor by decomposing the electrolyte. For 300F/2.7V cells, use active balancing ICs (recommended for >3 cells) or passive balancing resistors (100-500 Ohm per cell). Balancing ensures equal voltage distribution and maximizes usable energy storage.
Always implement cell balancing for series configurations. Active balancing is recommended for systems with 4+ cells or high-reliability requirements.
What is the self-discharge rate of EDLC 300F/2.7V and how does it affect my design?
EDLC 300F/2.7V has a typical self-discharge rate of 5-20% per day depending on temperature and initial voltage. The self-discharge follows a logarithmic curve - fastest in the first hours after charging. At 25C, voltage may drop from 2.7V to 2.4V in 24 hours without load. This characteristic makes supercapacitors unsuitable for long-term backup (days/weeks) but ideal for short-term backup (minutes/hours) and pulse power applications. For designs requiring longer backup times, consider: 1) Periodic topping charge; 2) Larger capacitance; 3) Hybrid battery-supercapacitor systems.
Consider self-discharge in your backup time calculations. For backup requirements exceeding 24 hours, evaluate hybrid energy storage solutions.