Line Losses Calculator
Line Losses Calculator
An automatic calculator to work out line losses in DC powered systems
home > storage | generalIn our article Minimising Line Losses in RE Systems we looked at how the diameter of wire (cable) should be selected to ensure that line losses (i.e. energy lost when the current flowing through a wire heat it up) are kept below 10%.

If you are interested in understanding the equations which are used to make the calculations below, then we recommend you read the article linked to above.
Wire Size Calculator
Enter the peak charging voltage (volts DC - e.g. 14V to 20V for a 12V rated wind turbine), wire length (metres), peak current (Amps), and maximum acceptable power loss (%, we suggest 10% or lower), and click Calculate to view the minimum cross sectional area of the wire you should use.To convert the above wire cross sectional area to AWG, mm diameter, or inch diameter, click here to go to our Automated AWG Wire Size Converter. Remember to choose a wire with a slightly larger cross sectional area than that recommended above to ensure that power losses are below your maximum acceptable percentage.
Line Losses Calculator
Alternatively use the calculator below to work out the line losses for a system with a given wire size (diameter measured in mm).
Comment on this Article
If you have any comments on this article, please email them to neil@reuk.co.uk.Related Articles and Products
More from the REUK.co.uk website:Solar Shed Lighting Calculator Work out the specifications for a solar powered shed/garage/outhouse lighting system ![]() | Basic Ammeters and Voltmeters Find out how to monitor the health of your RE system's generator and batteries ![]() | 12 Volt Deep Cycle Batteries for Solar Buy deep cycle 12V batteries for small scale solar powered projects ![]() | LM2941 1A Low Dropout Adjustable Regulator Find out about the LM2941 - an adjustable regulator with very low dropout voltage ![]() |
Minimising Line Losses in RE Systems Select wire of the correct diameter for your renewable energy system ![]() | TL431 Battery Voltage Monitor Monitor the voltage of a battery or battery bank using an TL431 (aka LM431) shunt regulator ![]() | Alkaline Battery Regeneration Find out more about the Souvenir Cranwell Alkaline Battery Regenerator ![]() | Fuses for Power Inverters Find out more about fuse protection of power inverters used to convert battery bank DC voltage to mains voltage AC ![]() |
storage, general.