
BATTERIES
To achieve 50% cycling you should |
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calculate your |
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between charging cycles and use a battery |
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| (AC amps x 10) x 1.1 x hours of |
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bank with twice that capacity**. Each AC |
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| operation = DC amp hours |
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appliance or tool has a rating plate on it and will |
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| (watts/ DC voltage) x 1.1 x hours of |
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be rated in either AC amps or watts or AC VA |
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| operation = DC amp hours |
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hour consumption, use one of the formulas to |
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| (AC VA/ DC voltage) x 1.1 x hours of |
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the right to calculate the DC |
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| operation = DC amp hours |
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a |
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| DC voltage is 12, 24 or 32 depending on |
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Calculate the amp hours for every AC |
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| your system. |
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appliance or tool that will be operated on the |
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inverter. This will provide the total number of |
| In all formulas, 1.1 is the correction factor for | |||||||||||||||
amp hours used between recharges. Size the |
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| inverter efficiency. | |||||||||||
battery bank using this number as a guideline. |
| Typical Power Consumptlon | |||||||||||||||
A good rule to follow is to size the battery bank |
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a minimum of two times larger than the |
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| The chart identifies typical power | ||||||||||||
total |
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| consumption for common AC loads. Use it as | |||||||||||||
recharging when 50% discharged. |
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| a guide when identifying your power | |||||||||||
**Batteries are typically charged to 85% of full |
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| Many electric motors have | ||||||||||||
charge when charging with alternators without three- |
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stage regulators. |
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| momentary starting requirements | |
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| well above their operational rating. | |
| Typical Power Consumption |
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| Start up watts are listed where | |||||||||||
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Appliance | Typical |
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| Appliance Run Times / Amp Hours |
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| appropriate. Individual styles and | |||||||||
Wattage |
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| brands of appliances may vary. | ||||
| 5 Min. | 15 Min. | 30 Min. |
| 1 Hr. |
| 2 Hr. |
| 3 Hr. | 8 Hr. | 24 Hr. | ||||||
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| If using the same battery | |
13" Color TV | 50 |
| .33 | 1 | 2 |
| 4 |
| 8 |
| 12 |
| 32 | 96 |
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| bank for the inverter and other | |
19" Color TV | 100 |
| .66 | 2 | 4 |
| 8 |
| 16 |
| 24 |
| 64 | 192 |
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| DC loads, be sure to consider | |
VCR | 50 |
| .33 | 1 | 2 |
| 4 |
| 8 |
| 12 |
| 32 | 96 |
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| the power consumption of the | |
Lamp | 100 |
| .66 | 2 | 4 |
| 8 |
| 16 |
| 24 |
| 64 | 192 |
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| DC loads when sizing the | |
Blender | 300 |
| 2 | 6 | 12 |
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| battery 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 | ||||||||||
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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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