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Battery Types and Sizes
C–4
Estimating Battery Requirements
To determine how much battery capacity you need:
1. Determine how many watts are consumed by each appliance that you
will operate from the PROwatt 3000. You can normally find this on a
label on the product. If only the current draw is given, multiply it by
115 to get the power consumption in watts.
2. Estimate how many hours each appliance will be operating each day.
3. Calculate the daily watt-hours needed for each appliance.
4. Add the total number of watt-hours needed for all the appliances and
multiply it by the number of days between charges.
5. Divide the total watt-hours of AC load between charges by 10. This
gives the battery Ah used between charges.
6. Double the total Ah used between charges to get the recommended
battery size in Ah.
See the battery sizing example that follows.
Battery Sizing Example
This battery sizing example illustrates a typical calculation, assuming an
opportunity to charge the batteries every three days.
Appliance
(A) Power
Consumption
(B) Operating
Time per Day
Daily watt-hours
needed for this
appliance
(= A x B)
TV & VCR
115 W
3 hours
345 Wh
Microwave oven
1500 W
15 min = 1/4 hour
375 Wh
3 lamps, 60 W each
180 W
4 hours
720 Wh
Coffee maker
750 W
15 min = 1/4 hour
187.50 Wh
Coffee grinder
100 W
1 min = 1/60 hour
16.70 Wh
Hair dryer
1500 W
6 min = 1/10 hour
150 Wh
Sewing machine
150 W
30 min = 1/2 hour
75 Wh
Washing machine
1500 W
30 min = 1/2 hour
750 Wh
Steam iron
700 W
6 min = 1/10 hour
70 Wh
Total daily watt-hours of AC load
2689.20 Wh
x Number of days between charges
3
= Total watt-hours of AC load between charges
8067.60 Wh
Battery Ah used between charges (divide by 10)
806.70 Ah
Recommended Battery Bank Size in Ah (multiply by 2)
1613.40 Ah
Summary of Contents for PROwatt 3000
Page 1: ...Owner s Guide PROwatt 3000 Inverter...
Page 6: ...vi...
Page 10: ...x...
Page 16: ...1 4...
Page 42: ...3 18...
Page 50: ...4 8...
Page 60: ...B 4...
Page 70: ...C 10...
Page 76: ...D 6...
Page 82: ...Index 6...