The 5kW Vanadium Redox Battery

The 5kW Vanadium Redox Battery (VRB) Energy Storage System (ESS) is an environmentally friendly, long-life, virtually maintenance-free storage system designed to replace conventional lead acid battery systems. The VRB-ESS addresses the problem of traditional lead acid battery systems such as short lifetimes, maintenance requirements, and recycling costs.

The VRB-ESS provides multiple simultaneous DC outputs without electronic conversion for telecommunication applications and can also be integrated with AC systems with the addition of an inverter.

The small VRB-ESS's will include a range of self contained system designs between 2.5kW's to 10kW's (10kWh's to 20kWh's) for applications to the telecom's industry, utility substation backup systems, Remote Area Power Supplies (coupling with small diesel generators to reduce diesel costs and emissions), small commercial buildings and off grid household applications (coupling with renewable generation such as wind & solar). All systems can be extended to provide longer storage durations at very low incremental costs through the addition of electrolyte, for example, meeting utility backup requirements of 24 hours or longer.

Product features for a 5kW x 4 hour device include:

VRB-ESS Lead Acid

Current Output 5kW (112A) x 4 hours 112A x 4 hours

Output Voltage Range (VDC) 42-56 42-60

Dimensions (W x D x H in.) 32 x 72 x 90 32 x 30 x 90

Approx Weight (full, lbs.) 6800 2600

Thermal (Stg/Opg, °F) 32-100/32-100 32-100/32-100

DC-DC Efficiency, round trip 70-78% 45%

Performance vs. Temp Flat response over temp, range IEEE/ANSI and manufacturers derating

Containment Double containment of electrolyte storage cabinet drip tray

Lifetime (discharge cycles) 13,000+ 1,500

Depth of Discharge From full to 20% state of charge From full to 80% state of charge*

Recharge Time 4 hours (1:1 charge/discharge ratio) 20 hours (5:1 charge/discharge ratio)

Speed of Response 1ms 1ms

Overload capacity 2x normal rating 1.25x normal rating

Maintenance Annual inspection if desired At least 4 times per year

*deeper discharges reduce life exponentially

Picture shown above is a 10kWh VRB-ESS (5kW for 2 hours or 2.5 kW for 4 hours).
Compact footprint (45"W X 34"D X 76"H)
Approx. weight (full) 3500 lbs

	VRB-ESS	Lead Acid
Current Output	5kW (112A) x 4 hours	112A x 4 hours
Output Voltage Range (VDC)	42-56	42-60
Dimensions (W x D x H in.)	32 x 72 x 90	32 x 30 x 90
Approx Weight (full, lbs.)	6800	2600
Thermal (Stg/Opg, °F)	32-100/32-100	32-100/32-100
DC-DC Efficiency, round trip	70-78%	45%
Performance vs. Temp	Flat response over temp, range	IEEE/ANSI and manufacturers derating
Containment	Double containment of electrolyte storage	cabinet drip tray
Lifetime (discharge cycles)	13,000+	1,500
Depth of Discharge	From full to 20% state of charge	From full to 80% state of charge*
Recharge Time	4 hours (1:1 charge/discharge ratio)	20 hours (5:1 charge/discharge ratio)
Speed of Response	1ms	1ms
Overload capacity	2x normal rating	1.25x normal rating
Maintenance	Annual inspection if desired	At least 4 times per year