Calculate your monthly Electricity consumption                   

Wapda Bill Calculation 

Example:

Suppose, a consumer consumes 1000 watts load per hour daily for one month. Calculate The Total Energy bill of the consumer if per unit rate is 9 (In $, £, €, INR ,Rs, DHR, Riyal etc) [Take 1 month = 30 Days].

Solution:

1unit = 1kWh.

So Total kWh = 1000 Watts x 24 Hrs x 30 Days = 720000 watts/hour.

we Want to convert it into Units, Where is 1unit = 1kWh.
So total Consumed units. 720000/1000…… (k=kilo=1000).
Total Units = 720.
Cost of per unit is 9.

So total Cost or Electricity bill= 720 x 9 = 6480. (In $, £, €, INR ,Rs, DHR, Riyal Rs: etc). You have Done


Battery Amp Hour Calculator                         To determine the approximate power drain on your battery you will want to estimate the reserve power (amp/hour) and the amps the inverter will require to meet the continuous load demands of the appliance.

Calculating UPS/INVERTER Battery Backup:

              Before calculating the Battery Backup, let us know a few factors that vary battery backup.
For and UPS with 875Va we can us a maximum load of 640 watts
                             677Va we can us a maximum load of 540 watts
     The main thing we have understand is that what ever may be the UPS wattage the battery backup will not vary. The battery backup will only vary depending on the battery Ah and the Usage Load.

              To calculate UPS backup, We have a simple formula.

                      UPS Backup = Battery Ah * (Volts/Load) * (1/Powerfactor)

Example:        Let us calculate the backup for a system UPS

                  Load is the usage power, suppose we are running a PC then the load is around 300 watts
        
                  Power Factor varies for device to device, the average power factor is 1.4

                  Voltage is the voltage of the battery.
                                 For a single battery the voltate is 12v.
                                 If the batteries are connected in a series   Voltage = 12 * no. of batteries.

                  Battery Ah is the battery ampere used for the ups,
                                      System UPS battery AH is 7

                     Then   Battery Backup =  7 * (12/300) * (1/1.4)
                                                        =  7 * (0.04) * (0.7)
                                                        =   0.19 hours
                                                        =    19 Minutes

Note:    You can use the same formula for calculating the battery backup for home UPS or an INVERTER.


Battery Charge Time Calculator

Battery Charging Current and Battery Charging Time formula

Here is the formula of Charging Time of a Lead acid battery. 
Charging Time of battery = Battery Ah / Charging Current
 T = Ah / A
 
Example,
Suppose for 120 Ah battery, 
First of all, we will calculate charging current for 120 Ah battery. As we know that charging current should be 10% of the Ah rating of battery.
so charging current for120Ah Battery = 120 x (10/100) = 12 Amperes.
but due to losses, we can take 12-14Amperes for charging purpose.
suppose we took 13 Amp for charging purpose, 
then charging time for 120Ah battery = 120 / 13 = 9.23 Hrs.
but this was an ideal case…
practically, this is noted that  40% of losses ( in case of battery charging)
then 120 x (40 / 100) = 48 …..(120Ah x 40% of losses)
therefore,  120 + 48 = 168 Ah ( 120 Ah + Losses)
Now Charging Time of battery = Ah/Charging Current 
168 / 13 = 12.92 or 13 Hrs ( in real case)

Therefore, an 120Ah battery would take 13 Hrs for completely charging ( with 13A charging current).


 

Wire-Voltage Loss Calculator 

 

Solar Panel Wiring Calculator      

 

Solar Sizing Plans

 

AC BTU Calculator                          This calculator uses metric measurements. It can help you estimate BTU heating requirements for various room dimensions. You can convert feet to meters below if needed                 

 

Power Calculations              Power Calculations and formulas for quick conversions

 

Watts to amps calculator

 

 

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

 

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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