Energy Calculator

Know your energy consumption, we do the rest!

Use our energy calculator to document your current energy consumption. Try and do this as completely as possible as this is crucial to system design.

Once completed send it to Exon Consulting and we will contact you to discuss your system sizing, possible system options and ways to save energy rather than to oversize your solar solution. This way we start saving you money before we even started with your solar project!

How to use the energy calculator:

Step 1:   Download our calculator.
Step 2:  List all the appliances you want to be Solar Powered (e.g. TV, Fridge, Lights, etc..).
Step 3: For each appliance listed, determine how many there are of that appliance (Quantity).
Step 4: For each appliance, determine it’s power needs in Watts (W).  TIP: It is often written on the appliance, have a good look.
Step 5:  For each appliance, determine how long (Hours per Day) it is required to be ON in total.
Step 6:  Let the spreadsheet calculate each appliances Total kWh and Spreadsheet Totals.
Step 7:  Email your solar energy calculation back to us and we will do the rest.  Send To:  calculation@exonconsulting.co.za   or   info@exonconsulting.co.za
                                                    or   Select a system using our 3-Step process   (Tip: match your kWh’s to the system kwh’s).

Notes:
  • Please fill in info that reflects what loads (fridges, lights, TVs, etc) get used on an actual day that needs to be solar powered.
  • Only fill in the appliances that get used in your home on a typical day (on average). So think of your typical day!
  • If this typical day changes significantly on say a weekend; please make a Note for us and tell us what/how it differs.
  • Do Not, go list ALL the appliances (e.g. Lights) in your home, unless they get used (ON) each typical day!!

                                                                                             Example: Bathroom lights usually do not get used for more than a few minutes per day.

 

Create you own calculator:
Create your own calculation by following these instructions:
The QTY is the number of appliances connected.
The WATTS is the power rating of the appliance (see user manual or back of appliance to find the power rating in Watts).
The HOURS is the duration in hours the appliance is to be powered per day or during a power outage.

The WATTS/HOURS is the calculation of:  QTY  x  WATTS  x  HOURS  = WATTS/HOURS.

                            Notes: WATTS/HOURS is used to size the battery bank and the solar panel array.

The WATTS (peak) is the calculation of:     QTY  x  WATTS                    = WATTS (peak)

                            Notes: WATTS (peak)  is used to size rating/size of the inverter.

Appliance
Watts
Appliance
Watts
Appliance
Watts
Central Air Conditioner NA
5,000
Electric blanket
200
Hedge trimmer
450
Electric Clothes Dryer NA
3,400
Shaver
15
Weed eater
500
Oven
3,000
Waterpik
100
1/4” drill
250
Hair Dryer
1,538
Well Pump (1/3-1 HP)
480-1200
1/2” drill
750
Dishwasher
1200-1500
Laptop
60-250
1” drill
1000
Coffee Machine
1,500
Plasma TV
339
9” disc sander
1200
Microwave
1,500
LCD TV
213
3” belt sander
1000
Popcorn Popper
1,400
25” color TV
150
12” chain saw
1100
Toaster oven
1,200
19” color TV
70
14” band saw
1100
Hot Plate
1200
12” black and white TV
20
7-1/4” circular saw
900
Iron
1,100
Stereo
10-30
8-1/4” circular saw
1400
Toaster
1,100
Satellite dish
30
Refrigerator/ Freezer**
Microwave
500-1500
Radiotelephone – Receive
5
20 cu. ft. (AC)
1411 watt-hours/day*
Room Air Conditioner NA
1,100
Radiotelephone – Transmit
40-150
16 cu. ft. (AC)
1200 watt-hours /day*
Vacuum Cleaner
500
Lights
Freezer
Water heater
479
100 watt incandescent bulb
100
15 cu. ft. (Upright)
1240 watt-hours /day*
Sink Waste Disposal
450
25 watt compact fluor. bulb
28
15 cu. ft. (Chest)
1080 watt-hours /day*
Espresso Machine
360
50 watt DC incandescent
50
Cell Phone – recharge
2-4 watts
Dehumidifier
350
40 watt DC halogen
40
MP3 Player – recharge.25-.40 watts
Blender
300
20 watt DC compact fluor.
22

* TV’s,VCR’s and other devices left plugged in, but not turned on, still draw power.

**To estimate the number of hours that a refrigerator actually operates at its maximum wattage, divide the total time the refrigerator is plugged in by three. Refrigerators, although turned “on” all the time, actually cycle on and off as needed to maintain interior temperatures.

Humidifier
300-1000
CFL Bulb (60-watt equivalent)
18
Video Game Player
195
CFL Bulb (40-watt equivalent)
11
Standard TV
188
CFL Bulb (75-watt equivalent)
20
LCD Monitor
80-150
CFL Bulb (100-watt equivalent)
30
Desktop Computer (Standard home/business)
80-120
Heaters***
Desktop Computer (Gaming)400-1000+
Laptop Computer40-120
Portable Fan
100
Engine Block Heater NA
150-1000
Ceiling Fan
100
Portable Heater NA
1500
Can Opener
100
Waterbed Heater NA
400
Curling Iron
90
Stock Tank Heater NA
100
Stereo
60
Furnace Blower
300-1000
Cable Box
20
Clothes Dryer – Gas Heated
300-400
Clock Radio
7
Well Pump (1/3-1HP)
480-1200

* The daily energy values listed here are for the most efficient units in their class and the information was obtained from Consumer Guide to Home and the General Electric website.

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