Comparison and Proof of Benefits Procedure
Comparison and proof of electricity cost savings may be classified into the following two types:
- Electrical energy values (kWh) are usually used to compare electricity cost savings, using the SEMS "SunPower Energy Monitoring System" software electrical calculation and analysis program.
- Recordings are divided into the following 2 periods:
Recordings before the use of Isthmus SunPower device. Recording Period: 15 days OFF Isthmus SunPower device.
Recordings during the use of Isthmus SunPower device. Recording Period: 15 days ON Isthmus SunPower device.
- Data from the two periods will be compared to calculate energy-savings, using data with
similar loads. This may be divided into the following steps:
| 1. Under Normal Conditions: |
2. With SunPower™ Energy Saving Installed |
Voltage: 415V
Actual Current (Ampere): 353 A
(assume loading constant)
Power Factor: 0.91 |
Voltage: 415V
Actual Current (Ampere): 300 A
(assume loading constant)
Power Factor: 0.94 |
Power KW = √ 3 x V x | x Power Factor:
= 1.732 x 415 x 353 x 0.91
= 233.6756 kWh
|
Power KW = √ 3 x V x | x Power Factor:
= 1.732 x 415 x 300 x 0.94
= 205.14 kWh
|
Total kWh per day:
= 230.8937 kWh x 24 hours
= 5541.448 kWh
|
Total kWh per day:
= 202.6956 kWh x 24 hours
= 4864.695 kWh
|
Electricity tariff =
0.138 cents per kWh
|
Electricity tariff =
0.138 cents per kWh
|
Cost of Electricity per Day:
= 0.138 x
5541.45
= $ 764.72
|
Cost of Electricity per Day:
= 0.138 x
4864.70
= $ 671.32
|
|
Savings to
Client:
=
12.21 %
= $ 93.40 per day
|
3.1. Find a period with similar electricity consumption habits (kW) from the "SEMS Sunpower Energy Monitoring System" Electrical. Recording and Analysis Program’s daily electricity consumption report.
3.2. When periods with similar operation are identified, calculate the average for each period
using only the units (kWh) from periods of similar operation.
3.3. Compare electricity consumption data (kWh) from the two periods, and calculate energy
consumption savings (kWh) as follows; (average energy (kWh) prior to using Sunpower) – (average energy (kWh) during use ofSunpower)
(energy value (kWh) prior to using Sunpower) |
Type of Mesure &Verification
1. Types with differing electricity consumption rates, but with a main variable affecting increases or reductions in energy consumption.
2. Types with differing electricity consumption rates, where no variable affecting increases or reductions in energy consumption was found.
Procedure of Measure &Verification
1. The company will inspect the electrical system present installation set-up.
1.1 Inspect electricity consumption habits, operation methods and production.
1.2 Inspect types and sizes of machinery, and the electrical power used by each machine.
2. The company will hold a meeting with the customer in order to summarize methods of
comparison and proof of energy savings, which must be mutually agreed.
3. Isthmus SunPower will install their device and collect the results before and after installation. The installer will collect the electrical analysis to calculate the cost savings.
4. When collection of data prior to installation is completed, the Isthmus SunPower will install and switch on the Isthmus SunPower device, and commence collection of data during use of the equipment, until a specified date.
5. When all data have been collected, comparison and proof of energy-savings will be carried out according to the agreed period.
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