EDG Cable Sizing 1

[Prabakaran_Pachaiyappan]

Hi All,

I have a EDG, Cranking motor current requirement at firing speed is = 1666A DC.

How would I size the Cable for this?
Cable to be laid between the Battery terminals to the Cranking motor terminals).

Length of cable from battery terminals to Motor terminal=150 meters.

Please advise.

Thanx in advance
Prabakaran

 

[waross]

At that distance size for voltage drop.

--------------------
Ohm's law
Not just a good idea;
It's the LAW!

 

[TugboatEng]

That's a lot of cable. Have you considered using air to start?

 

[Hoxton123]

I agree air start, or is there any reason you cannot move the battery?

 

[FacEngrPE]

http://wiresizecalculator.net/

refuses to provide a valid answer, just indicated >2000 kcmil. There are very good reasons to not place batteries at large distances from the engines they start.

https://www.southwire.com/calculator-vdrop

suggests 6 parallel 1000 kcmil (500mm^2) sets, assuming 48V system, which is unlikely to be available.
This arrangement is one where providing calculations may be useful only to convince a client a concept is not worthy of significant effort.

 

[Prabakaran_Pachaiyappan]

can someone suggest an alternative options to solve this issue. it will be helpful

 

[TugboatEng]

We already proposed moving the batteries closer to the engine or using air start. Does your facility have compressed air available?

 

[FacEngrPE]

Compressed air start is an off the shelf, reliable, widely used starting method. Admitted not as widely used as battery starters. In some applications air starters are preferred over battery start.
Your engine supplier should be able to provide a quote for the hardware components needed for your specific engine, and recommend a minimum storage volume for a specific number of starts.

Background info

https://en.wikipedia.org/wiki/Air-start_system

Web search

https://duckduckgo.com/?t=lm&q=compressed+air+engine+starter&ia=web

 

[TugboatEng]

If you place the air receiver on or near your generator skid you can run small piping from your facility to fill the receiver. This will be significantly less expensive than running the massive amount of cable your installation requires.

TDI makes the best starters, except for the Turbo Start 2 model. That one doesn't like wet air. We prefer pre-engaged over inertia start models.