. Off-Grid Solar System Calculator

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STEP 3: Size Your System for Off Grid
How big should your Off-Grid system be?
If you are moving from a utility-connected home in the 'burbs' to an off-grid home in the boonies, you will have the opportunity (perhaps necessity) of downsizing your electricity usage. In order to calculate how large your home power system needs to be, run the calculator below TWICE. Compare and adjust your plans according to your budget and lifestyle.
Four Easy Steps to Design Your Own System

Step 1 - On Lower Your Energy Use!
Step 2 - Decide What Kind of System You Need
Decide What Kind of System You Need
Step 3 - Size Your System for Off-Grid Size Your System for Off Grid or
Size your System for Grid-tie
Step 4 - Pick Your Components Pick your Components
or
Let us Design Your System.
Call us: 1(800) 472-1142



Off-Grid System Sizing Calculator
Wholesale Solar Off-Grid System Size Calculator
1. How much electricity do you use each month?
Look at your electric bills from the past 6 months (or less) and find the average number of Kilowatt Hours (KwH) per month. Put this number in the space to the right.
OR
Use the Actual Watt Hours per day at the end of your Load Evaluation Calculator OR (PDF) multiply results by 30 (for monthly total) and divided by 1000 (to convert to KwHours).
KwH/Month
2. What percentage of your house/business power do you want to generate with solar power? If you want to produce 100% of your electricity, put 100.

%
3. How many Peak Sun Hours do you get per day? Look at the Solar Map below to find this number.
Hours
Minimum System Size:
Watts

For 30 Kyocera 140-watt solar panels to produce 4,200 watts..... 4,200 divided by 140(watts per panel) = number of solar panels needed.

NOTE: These figures are approximate and do not take into account the variable efficiency ratings of solar panels and off grid inverters. Please work with experienced Wholesale Solar staff to design a system which fits within your budget and can be expanded as needed.

How Many Sun Hours a Day Do You Get?

Zone 1      6 hours
Zone 2      5.5 hours
Zone 3      5 hours
Zone 4      4.5 hours
Zone 5      4.2 hours
Zone 6      3.5 hours

The hourly figure indicates the average (over the course of the year) amount of insolation (full sun hours) for these zones.  These figures are based on the yearly average; consequently, systems based on these figures will provide more power in summer and less in winter.  Winter figures for daily solar gain may be from 25% to 50% LESS than these average figures.

SUN HOURS/DAY ZONE MAP
solar insolation map


Load Evaluation Calculator
Wholesale Solar Load Evaluation Calculator
Appliance Quantity Watts
(V x A) Mult. * 1.5 for AC
Hours On per Day Watt Hours per Day
Total Watt Hours per Day:
Watts
Watt Hours Required Assuming Inherent Efficiency Loss:
Watts


Appliance Electrical Consumption Table
These figures are approximate, for best results use ratings from your own appliances.
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
1200-2400
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.

Another option for finding appliance energy ratings is to find the Energy Star rating and divide that by 365 to get your daily kwh usage.

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
Monitor
150
CFL Bulb (100-watt equivalent)
30
Computer
120
Heaters***
 
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


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