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					+250.423.2630 Info@elkvalleysustainability.ca

Hello all, Here it is our Simple System Sizing tool and assorted information to assist you in determining the load calculations for your renewable energy system. Contained in these pages is:

   

Simple Instructions Appliance Power Consumption Chart Load Calculation Table Energy Budget Table

Please Note: The tables are editable; just double click them to activate.
These get easier to do after you’ve been through them a couple of times; don’t hesitate to call if you need guidance. The internet is still the best way to see what we’re up to and to get a hold of us. There are a pile of good links on our site if people want to educate themselves in the exciting world of renewable energy. Aside from that, be kind, spread the word and keep in touch. Sincerely, Elk Valley Sustainability

Instructions Step 1 – Load Calculations Table
Complete Load Calculation Table using Appliance Power Consumption Chart information from table 1 and determine the power usage estimates for your particular case. If consumption information in watts is not available, its value can be obtained by multiplying an appliance's rated current draw in amps by its operating voltage. Most household appliances operate at 120V while DC lighting is usually 12V. This Load Calculation Table can be edited for various configurations of renewable energy systems.

Step 2 – Energy Budget
Use the data from the Loads Calculations Table and enter the appropriate numbers as require to complete the Energy Budget calculations. Note that some of the numbers may be reused at different steps.

Step 3 – Inverter Selection
Inverters are rated in terms of maximum continuous watts. Inverter size can be determined by estimating the largest total load in watts that you expect to be required at once.

Step 4 – Battery Sizing
Average bright sunshine hours for various locations throughout BC can be found in the Average bright sunshine Hours Table (below). For summer only residences, use the values recorded for September. For year round applications, use January values. When designing a system it may be more economically feasible to back your system up with a fossil fuel generator during the winter months.

Step 5 – Charge Controller
A charge controller for PV applications can be selected using the value calculated for array current.

Step 6 – PV Array Sizing & Selection
A module consists of one or more panels connected in series to obtain the appropriate system voltage. Module current is consistent with rated panel current. i.e. two 12V panels connected in series form a 24V module with the same current as the individual panels. Current is increased when modules are connected in parallel but module voltage is maintained.

Step 7 – Generator Selection
When sizing wind turbines, some average wind speed data for your area might be obtained through Environment Canada, or you will need to set up a monitoring station.

Appliance Power Consumption Chart
Note: The wattages given below are estimates. The actual wattage required for your appliances may differ from those listed. Check the nameplate on the appliance to determine the actual wattage required. * Appliances and tools with induction motors (marked * in tables) may require from 3 to 7 times the listed wattage when starting. The start-up load of the appliance or tool determines whether an inverter has the capability to power it. Be sure to check the specific wattage requirements and operating instructions for appliances / tools to be used.

Lights - Incandescent Bulbs Lumens 270 510 780 860 1,540 1,680 Appliance Coffee pot (10 cup) Coffee pot (4 cup) Toaster Cappuccino Maker Coffee Grinder Blender Microwave 600 to 1000 W power Waffle iron Hot plate Frying pan Toaster Oven Blow dryer Computer - laptop - pc & monitor - printer-inkjet *Refrigerator/Freezer *Freezer Tool Jig Saw Band Saw Table Saw 6 1/2" circ. saw 7 1/4" circ. saw 8 1/4" circ. saw Disc Sander Chop Saw Cut Off Saw Pump *Well Pump 1/3 hp *Well Pump 1/2 hp *Sump Pump 1/3 hp *Sump Pump 1/2 hp Air Conditioner *7000 BTU to 10000 BTU

Est. Watts 25 40 52 60 90 100

Lights - Compact Fluorescent Bulbs Lumens 250 400 600 900 1,250 1,800 Appliance

Est. Watts Watts 5 7 9 15 18 26

1200 650 800-1500 1250 100 300 1100-2000W consumption 1200 1200 1200 1200 900-1500 50-75 200-400 60-75 600 500-800 Est. Watts 300 1200 1800 1000 1200+ 1800 1200 1550 1000 Running 750 1000 800 1050 1000-1500 Starting 1400-3000 2100-4000 1300-2900 2150-4100 2200-5000

VCR CD Player Stereo Clock Radio AM/FM car cassette Satellite dish Vacuum cleaner Mini Christmas lights (50) Space Heater Iron Washing machine Table fan TV - 25" color - 19" color TV or monitor - 12" b&w 13" color TV/VCR Combo Game Console (X-Box) *Furnace Fan (1/3hp) Tool 1/4" drill 3/8" drill 1/2" drill Shop Vacuum 5 hp *Saber Saw *Portable Grinder *Electric Chain Saw 14" *Airless Sprayer 1/2 hp *Air Compressor 1 hp

40-60 35 30-100 50 8+ 30+ 300-1100 25 1000-1500 1000 920 10-250 300 160 30 230 100 1200 Est. Watts 250 500 750 1000 500 1380 1200 600 2000

*A/C's motors a very difficult load because of the high start-up surge.

Load Calculation Table
Volts x Amps = Lights Family Room Dining Room Kitchen Bedroom 1 Bedroom 2 Hall Laundry Toilet Outside Appliance Fridge Freezer Washing Machine Clothes Dryer (propane/gas only) Toaster Iron Ceiling Fan Hot Water Circulation Pump Well Pump Electronics Television VCR / DVD Stereo Computer Power Tools Skill Saw Table Saw Nail Gun Compressor x x x x x x x x x x x x x x x x x x x x x x x x x x x x x = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 x x x x x x x x x x x x x x x x x x x x x x x x x = = = = = = = = = = = = = = = = = = = = = = = = = 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Watts x No. of Units x Run Watt Hours Days/ Watt Hours = x = Time h /Wh Week /Wh

0.0 x = 0.0 x = 0.0 x = 0.0 x = Total Wh / Week

Energy Budget
1 2 3 4 5 6 7 8 9 10 11 The Daily Amp hour will will be used for the sizing the battery bank and PV array Daily Amp Hours This number represents a daily average of power production required. Divide the Daily Watt Hour by the system Voltage . For new systems, go with 24V minimum. System Voltage Multiply the Weekly Watt Hours by the Correction factor to get the adjusted value. Adjusted Weekly Watt Hours Divided by 7 days of the week, Daily Watt hours Load correction factor takes into account inefficiency of inverter and battery charging. Load Correction Factor*: Enter this number from the lower right corner of the Load Calculation Table Weekly Watt Hours

0 x 1.30 = 0 ÷7 0 ÷ 24 = 0

Battery Bank Sizing
12 13 14 15 16 17 18 Required Battery Capacity - Ah This ensures that the battery bank will not be cycled below 50% to prolong its life. Depth of discharge (D.O.D.) This will vary depending on your location , climate and season. Days of Autonomy (3-5) Use the Value you calculated in line 11. Daily Amp Hours

0 x 1 ÷ 0.50 = 0

PV Module Sizing
19 20 21 22 23 No. of Panels per Module - in series Nominal 12V panels are rated at around 17V, always use the nominal voltage Panel Voltage Carry Over the system voltage selected from Line 9. System Voltage

24 ÷ 12 = 2

PV Array Sizing
24 25 26 27 28 29 30 31 32 33 34 35 36 Total PV Panels Required Use the Value you calculated in line 23 No. of Panels per Module ( from above ) Number of parrell modules This value appears on the back of the PV panel or can be obtained from a spec sheet. Rated Panel Current This is the amount of current that the panels are required to produce. Required Array Current Calculate the averge sunshine for your area. Average Bright Sunshine Hours Use the Value you calculated in line 11. Daily Amp Hours

0 ÷ = ÷ = x 2 = 0

Wind / Hydro Generator sizing
37 38 39 Use the Value you calculated in line 11. Daily Amp Hours Hours per day Required Ave. Cont. charging Amps Required Ave. Cont. charging watts

0 ÷ 24 0 0


				
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posted:12/19/2009
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