The sizing formular calculates the minimum cross section for cables used in low voltage installations based on voltage drop on wires.
The cables have a certain resistance related to the cross-section and length, and therefore they will measure a voltage drop on them, depending on how much power they are conducting.
Recommended maximum voltage drop on wires:
- 2% at 12V
- 4% at 24V
- 5% at 48V
Limitations: The temperature of the cable is not taken into account!
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Procedure:
1. Fill in the length of the cable (between battery and consumption distance)
2. Fill in the maximum current through the cable
3. Also fill in the voltage of the battery / source
4. Press the corresponding battery voltage button
5. The results can be read in the field: the minimum cross section of the cable
6. Read the cross section, voltage drop on wires and voltage at the end of the cable
7. To reset all entered data: press the "Reset" button.
8. For new calculations: enter the new data and press the corresponding battery voltage |
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| Battery /
power supply voltage at 12V |
Battery /
power supply voltage at 24V |
Battery /
power supply voltage at 48V |
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| Cable
length |
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Meter |
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| Max
current |
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Ampere |
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| Voltage
loss (%) |
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Percentage |
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Results |
| Cable cross
section: minimum |
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mm˛ |
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| Voltage loss
(V) |
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Volt |
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| Voltage
at the end of the cable |
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Volt |
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