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BATTERIES
To achieve 50% cycling you should calculate your
Calculate the amp hours for every AC appliance or tool that will be operated on the inverter. This will provide the total number of amp hours used between recharges. Size the battery bank using this number as a guideline. A good rule to follow is to size the battery bank a minimum of two times larger than the total
DC voltage is 12, 24 or 32, depending on your system.
In all formulas, 1.1 is the correction factor for
inverter efficiency.
Typical Power ConsumptlonThe chart identifies typical power consumption for common AC loads. Use it as a guide when identifying your power requirements.
| **Batteries are typically charged to 85% of full charge | Many electric motors have momentary starting | |||||||||||||
| when charging with alternators without | ||||||||||||||
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| requirements well above their |
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| operational rating. |
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| Typical Power Consumption |
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| are listed where appropriate. | ||||||
| Appliance |
| Typical |
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| Appliance Run Times / Amp Hours |
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| Individual styles and brands of | ||||||
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| appliances may vary. | |||
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| Wattage |
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| 5 Min. | 15 Min. | 30 Min. | 1 Hr. |
| 2 Hr. |
| 3 Hr. | 8 Hr. | 24 Hr. | |||
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| 13" Color TV |
| 50 |
| .33 | 1 | 2 | 4 |
| 8 |
| 12 | 32 | 96 | If using the same battery bank |
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| for the inverter and other DC |
| 19" Color TV |
| 100 |
| .66 | 2 | 4 | 8 |
| 16 |
| 24 | 64 | 192 | |
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| loads, be sure to consider the |
| VCR |
| 50 |
| .33 | 1 | 2 | 4 |
| 8 |
| 12 | 32 | 96 | |
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| power consumption of the DC |
| Lamp |
| 100 |
| .66 | 2 | 4 | 8 |
| 16 |
| 24 | 64 | 192 | |
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| loads when sizing the battery |
| Blender |
| 300 |
| 2 | 6 | 12 |
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| bank. |
| Laptop Computer |
| 50 |
| .33 | 1 | 2 | 4 |
| 8 |
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| Curling Iron |
| 50 |
| .33 | 1 | 2 |
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| 3/8 Power Drill |
| 500 |
| 3.3 | 10 | 20 |
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| Icemaker* |
| 200 |
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| 2.6 | 5.2 |
| 10.4 |
| 15.6 | 41.6 | 83.2 |
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| Coffee Maker |
| 1000 |
| 6.6 | 20 | 40 | 80 |
| 160 |
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| 3 cu' Refrigerator* |
| 150 |
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| 2 | 4 |
| 8 |
| 12 | 32 | 96 |
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| 20 cu' Refrigerator* |
| 750 |
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| 21 | 42 |
| 84 |
| 126 | 336 | 672 |
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| Compact Microwave |
| 750 |
| 5 | 15 | 30 | 60 |
| 120 |
| 180 |
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| Full Size Microwave |
| 1500 |
| 10 | 30 | 60 | 120 |
| 240 |
| 360 |
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| NOTE Certain laser printers, breadmakers, |
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| Vacuum |
| 1100 |
| 7.3 | 22 | 44 | 88 |
| 176 |
| 264 |
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| digital clocks and appliance/tool chargers |
| Number in each box represents the total Amp hours used (@ 12 volt DC) based on various continuous run times. | may not operate on modified sine wave. | |||||||||||||
14 | *Note refrigeration is typically calculated using a |
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