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Inverters 12v dc to 240v ac
Index

Equipment
 Power Consumption Operating Time
Watt Hours (Power x Operating Time)
TV&VCR
115 watts
3 hours
345
Sewing Machine
150 watts
1 hour
150
Waterpik
90 watts
0.25 hour
22.5
Blender
300 watts
0.2.5 hour
75
Coffee Maker
750 watts
0.3 hour
225
Coffee Grinder
100 watts
0.2 hour
20
Microwave Oven
1500 watts
0.5 hour
750
Washing Machine
1500 watts
0.5 hour
750
Totals
6 hours
2337.5 watt-hours

Average Power Consumption 2337 watt-hrs ÷ by 6 hours = 390 watts
12 volt Ampere-Hours Consumed = Watt-hours ÷ 10 = 2337 ÷ 10 = 234 ampere-hours

or, for 2500W INVERTER volt system, Consumption 2337 watt-hours = 390 watts 24 volt Ampere-Hour Consumed Watt-hours ÷ 20 = 2337 ÷ 20 = 117 ampere-hours

   
Battery Size
    BCI Group Size 22NF 24 27 8D Dual 8DS
    Reserve Capacity 90 Minutes 140 Minutes 180 Minutes 400 Minutes 900 Minutes
Inverter
Output
Power
(watts)
Typical Load Amp - Hrs 50 75 100 200 400
50 Stereo System Operating Time 9 Hours 14 Hours 20 Hours 40 Hours 80 Hours
100 19" Colour Tv Operating Time 4 Hours 6 Hours 10 Hours 20 Hours 40 Hours
200 Computer Operating Time 2 Hours 3 Hours 4.5 Hours 10 Hours 20 Hours
300 Blender Operating Time 1.3 Hours 2.2 Hours 3 Hours 6 Hours 12 Hours
400 Small Power Drill Operating Time 1 Hour 1.5 Hours 2 Hours 4.5 Hours 10 Hours
600 Small Coffee Maker Operating Time     1 Hour 2.5 Hours 6 Hours
800 Small Microwave Operating Time       1.5 Hours 4 Hours
1000 Toaster Operating Time       1 Hour 3 Hours
1500 Full Size Microwave Operating Time       0.5 Hour 2 Hours
2500 Hair Dryer & Washing Machine Operating Time       0.2 Hour 0.8 Hour

When sizing your battery, be conservative. More capacity is better since you will have more reserve capacity, and your battery won't be discharged as deeply. Battery life is directly dependent on how deeply the battery is discharged. The deeper the discharge, the shorter the battery life. Ideally, the number of ampere-hours consumed by your loads before recharging the battery should be no more than 50% of the battery's rated capacity.

Using Multiple Batteries

To obtain sufficient battery capacity you may need to use more than one battery. Two identical batteries can be connected (+) to (+) and (-) to (-) in a parallel system that doubles capacity and maintains the voltage of a single battery. Do not connect batteries from different manufacturers, or with different amp-hr ratings, in parallel- decreased battery life may result. See Figure 7. (Note: 2500W INVERTER model inverter only: 24 Volt systems typically have 2 x 12 Volt batteries connected in series.)

Figure 7. Parallel Batteries