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Solar planning tools

DC кабл и пад напона

Estimate conductor area for a chosen DC voltage-drop target.

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Најмање · Површина · Пад напона
3.93 mm²
Површина
4 mm²
Voltage-drop criterion only
Пад напона
1.31 %
2.62 V · 39.3 W lost
Planning estimates, not equipment approval. Review the assumptions below before choosing a system.

No location or tariff is detected automatically. All results use the values you enter.

This guide is available in English and Urdu. English is shown below.

What is this tool used for?

Use this tool for a preliminary DC cable voltage-drop check between equipment locations. It helps compare a proposed conductor size with an acceptable drop target.

How to use this calculator

Choose conductor material and enter operating voltage, current, one-way cable length, maximum drop percentage, conductor temperature and the proposed cable area. Enter the one-way length; the calculation already includes the return path.

Understanding your results

The required conductor area addresses voltage drop only. A cable meeting this result may still be unsuitable for current capacity, installation conditions or protection. Final selection requires those separate checks; this is not a three-phase AC calculator.

Начин израчунавања

DC loop resistance = 2 × one-way length × resistivity ÷ area. Voltage drop = current × resistance. Required area = 2 × length × current × resistivity ÷ allowed voltage drop. Copper ρ20 = 0.0175 and aluminium ρ20 = 0.0282 Ω·mm²/m; temperature coefficients are 0.00393 and 0.00403 /°C.

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Пре употребе резултата

Voltage-drop sizing only: this does NOT check ampacity, insulation voltage, conduit fill, bundling, ambient derating, protective devices, connectors or local electrical rules. Final cable selection must satisfy those checks. Do not use this DC model for three-phase AC.

Is the suggested mm² safe for the current?

Not necessarily. It only meets the entered voltage-drop target. An installer must separately verify ampacity and installation requirements.

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