Power Controller Test on ½ HP Bench Grinder and Power Savings Calculations

1. Power Controller Test on ½ HP Bench Grinder and Power Savings Calculations This test will demonstrate that the power controller reduces the amount electricity, which the cost of operation.

2. Power Controller • Need picture • Picture of test setup

3. Power Controller Test on ½ HP Grinder • A test was conducted on a ½ HP bench grinder first without and than with the power controller. (See test diagram) • A multimeter was used to measure Volts AC by connecting 1 lead to the positive line and 1 lead to the negative line • The same multimeter was used to measure Amps by clamping on the positive or negative line.

4. Motor Specs ½ HP 3.6 Amps 120 Volts Wall outlet Gnd Multi Meter Multi Meter Test SetupWithout Power Controller This motor is in a no load condition ½ HP Grinder 120 Volt Source 1 lead on positive wire and 1 lead on negative wire to measure volts = 124 v Clamp one line positive or negative for amps = 1.88 amps Watts = volts * amps = 124 v * 1.88 amp = 233 watts

5. ½ HP Grinder Motor Specs ½ HP 3.6 Amps 120 Volts Wall outlet Gnd Test SetupWith Power Controller This motor is in a no load condition 120 Volt Source Power Controller Multi Meter Multi Meter 1 lead on positive wire and 1 lead on negative wire to measure volts = 124 v Clamp one line positive or negative for amps = .85 amps Watts = volts * amps = 124 v * .85 amp = 105.4 watts

6. Test Results • Without the power controller • Volts AC = 124 volts • Amps AC = 1.88 amps • With the power controller • Volts AC = 124 volts • Amps AC = .85 amps • (233 – 105.4) • After the motor comes up to operating rpm, the power controller recalculates the needed amps and volts required to operate and adjusts the amps coming from the power source, thus reducing operating cost. • The power consumption is a little different each location tested because the line voltage from the power company is a little different, (the 120 volts varies). Watts = volts * amps = 124 v * 1.88 amp = 233 watts Watts = volts * amps = 124 v * .85 amp = 105.4 watts 55% reduction in watts 223

7. Example of Electric Charges in SF Bay Area, California Baseline Quantity 350.9 Kwh Baseline Usage 350.9 Kwh @ $0.11531 per Kwh 101 - 130% of Baseline 105.27 Kwh @ $0.13109 per Kwh 131 - 200% of Baseline 7.83 Kwh @ $0.25974 per Kwh Based on watts usage – different cost depending on usage 3,072 watts * $.000115 cost/watt = .35 cents/day Baseline 3,072 watts * $.000131 cost/watt = .40 cents/day 101 – 130% 3,072 watts * $.000259 cost/watt = .79 cents/day 131 – 200%

8. Cost Savings Example If you are buying electricity for $0.115/KWatt hour = .115/1,000 = .000105 cost per watt 233 watts * 24 hours = 5,592 watts * .000115 cost/watt = .64 cents/day 105 watts * 24 hours = 2,520 watts * .000115 cost/watt = .29 cents/day 3,072 Savings per day .35 cents/day .35 cents / day * 365 days = $ 127.75 cost per year .40 cents / day * 365 days = $ 146.00 cost per year .79 cents / day * 365 days = $ 288.35 cost per year