where [W.sub.EV] is the affordable supply of all electric vehicles, W is the important load power, [W.sub.EV-i] is the affordable supply of i EV, [W.sub.j] is the electricity of j important user, [P.sub.EV-i] is the discharge power of i EV, [P.sub.j] is j actual demand important loads, m is the area electric vehicles sum, n is the area important users sum, [t.sub.pi] is expected power supply time for i EV, and [t.sub.j] is the actual emergency power supply
time for j important load.
The company, which has a workforce of 17, designs, installs, services and tests industrial battery systems and associated equipment for emergency power supply
for major customers all over the UK and aboard offshore oil rigs.
They provide preventative services/emergency maintenance, emission testing, fuel oil tank cleaning, load bank testing, plant control balancing, general management services and perform comprehensive inspections of emergency power supply
systems under NFPA 110 guidelines.