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What Vulcan™ Energy Systems Can Power

How Storage Capacity Is Measured

The output of the AC generator and the battery capacities are noted by the amount of energy they can provide over the period of one hour (thousand watt hours KWH). Thus, a 4KWH (4000 watt hour) system configuration means that the battery stores enough energy to run a 4000 watt load for 1 hour. However, the cost to generate AC energy from that 4KWH battery is 8.5% of the system energy. This means the system is 91.5% efficient.



Refrigerator Example


For a 21 cu. ft. Energy Star refrigerator that uses an average of 71 watts every hour, the formula to derive the number of hours that the 4KWH system can run the refrigerator until the battery is depleted is:

  1. Total hours of operation = 4000/71 for a total of 56.3 hours
  2. Multiply total hours by 91.5%
  3. Actual runtime hours = 56.3 * 0.915 for a total of 51.55 hours

This formula can be used to calculate the real number of hours that a system configuration can run any one or multiple series of appliances: (System size/total watts of appliances) * 0.915

Here is a sampling chart of several Vulcan configurations and the various durations that each appliance can run, based upon the Silicon Valley Power energy use chart from 11/25/2019.



Category Description Estimated Energy Usage Estimated Run @ 4KWh 8.6KWh 17KWH
Space Heater Portable Heater (600W) 0.6Kw per Hour 6.76hrs 10.86hrs 28hrs
Air Conditioning Window/wall (24k Btu) (120V-12 EER) 0.34Kw per Hour 11.76Hrs 19.16Hrs 50hrs
Portable Fan 0.03Kw per Hour 5.6 Days 9 Days 24 Days
Ceiling Fan Hill 2 Days 4 Days 11 Days
Kitchen Appliances Portable Induction Cooktop 0.2Kw – 1.8Kw per Hour 2.2hrs @1.8Kw 3.6hrs @1.8Kw 9.4hrs @1.8Kw
Microwave Oven 0.12Kw per 5 minutes 386 uses 651 uses 1700 uses
Coffee maker/brew, warmer on 0.4Kw per Hour 10hrs 16.3hrs 2 Days
Toaster (2 slices) 0.4kW per use 97 uses 163 uses 425 uses
Toaster oven 0.75Kw per Hour 5.3hrs 8.7hrs 23hrs
Energy Star Refrigerator, 14 cu. Ft. 0.048Kw per Hour 3.5 Days 5.6 Days 15 Days
Energy Star Refrigerator (frost-free), 17 cu. Ft. 0.049Kw per Hour 3.4 Days 5.5 Days 14.5 Days
Energy Star Refrigerator (frost-free), 19 cu. Ft. 0.064Kw per Hour 2.6 Days 4.2 Days 11 Days
Energy Star Refrigerator (Side by Side) 21 cu. Ft. 0.071Kw per Hour 2.3 Days 3.8 Days 10 Days
Energy Star Refrigerator (frost-free) 24 cu. Ft. 0.075Kw per Hour 2.2 Days 3.6 Days 9.5 Days
Energy Star Refrigerator (Side by Side) 25 cu. Ft. 0.083Kw per Hour 2 Days 3.3 Days 8.5 Days
Electronics 22” LED TV 0.03Kw per Hour 5.5 Days 9 Days 24 Days
30” LED TV 0.05Kw per Hour 3.3 Days 4.3 Days 14 Days
42” LED TV 0.08Kw per Hour 2 Days 3.4 Days 9 Days
>50” LED TV 0.15Kw per Hour 1 Days 2 Days 4.7 Days
DVD Player 0.03Kw per Hour 5.5 Days 9 Days 24 Days
DVR (Tivo) 0.04Kw per Hour 4.2 Days 6.7 Days 18 Days
PS4 0.14Kw per Hour 1.2 Days 2 Days 5 Days
PS4 Pro 0.15Kw per Hour 1 Day 1.8 Days 4.7 Days
Xbox 360 S 0.09Kw per Hour 72hrs 3 Days 7.9 Days
Xbox One X 0.17Kw per Hour 23.5hrs 1.6 Days 4 Days
PS3 0.19Kw per Hour 21hrs 1.4 Days 3.8 Days
Wii 0.04Kw per Hour 4.2 Days 6.7 Days 18 Days
Desktop Computer 0.06Kw per Hour 2.8 Days 4.6 Days 11.8 Days
Laptop 0.02 – 0.05Kw per Hour 3.3 Days 4.3 Days 14 Days
17” LCD Monitor 0.08Kw per Hour 2 Days 3.4 Days 9 Days
WiFi Router 0.005Kw per Hour 30.4 Days 50.35 Days 129.5 Days
Stereo Amplifiers 0.003Kw per Hour 50 Days 83 Days 215 Days
Tablet 0.005Kw per Hour 30.4 Days 50.35 Days 129.5 Days
Phones 0.005Kw per Hour 30.4 Days 50.35 Days 129.5 Days
Light Bulbs CFL/LED (8 W) equivalent to 25 W incandescent 0.008 kWh per hour 21 Days 34 Days 88.5 Days
CFL/LED (11 W) equivalent to 40 W incandescent 0.01 kWh per hour 16.7 Days 27.5 Days 71 Days
CFL/LED (15 W) equivalent to 60 W incandescent 0.015 kWh per hour 11 Days 18 Days 47 Days
CFL/LED (20 W) equivalent to 75 W incandescent 0.02 kWh per hour 8.3 Days 13.8 Days 35 Days
CFL/LED (27 W) equivalent to 100 W incandescent 0.027 kWh per hour 6.17 Days 10 Days 26 Days
CFL/LED (38 W) equivalent to 150 W incandescent 0.038 kWh per hour 4.4 Days 7 Days 18.6 Days
Household Appliances Vacuum cleaner 0.75 kWh per hour 17.4hrs 8.8hrs 22.7hrs
Dyson vacuum cleaner 0.23 kWh per hour 3.7hrs 28hrs 74hrs
Iron 1.08 kWh per hour 8 nights 6hrs 15.7hrs
Electric blanket: Twin 0.5 kWh/night 8 nights 13 nights 34 nights
Electric blanket: Double/Queen 0.75 kWh/night 5 nights 9 nights 23 nights
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