oke cable losses


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100kwh-hunter

Member
Joined
Mar 2, 2019
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816
I am very busy with my system and such, but those cable losses i think there is a solution for a far away battery bank?

If your bank is 25 meters away, you will need very thick cables.(25mm2?)
What if we use thinner cables (4mm2/6mm2) and place on every 5 meters a smaller battery bank?
First off all your battery banks would need a separate bms and they are extra storage.
Would this work if you would have at every 5 meters a 5 to 10kwh (extra storage) bat bank.
Or cable losses would still be there.
 

Wolf

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Sep 25, 2018
Messages
1,759
but those cable losses i think there is a solution for a far away battery bank?
The solution is higher voltage which in turn reduces the amperage and V drop If you would normally run, as an example, 200V at 30amps
which would require 6mm2. If your panels can take it go to 400V and you could still use 6mm2 wire but since you are reducing to 15 Amps
you could technically get away with 2.5mm2 cable. The only problem is that your charge controller needs to be able to handle this Voltage.

Wolf
 

Korishan

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Jan 7, 2017
Messages
6,938
As Wolf says, the only way to keep voltage drop low is to bump up the voltage. It's the amperage that makes the voltage drop.
So if you want to make the wires smaller, or have less drop over the same wires, then at the source it would be good to have your MPPT controller based there, and then output at a higher voltage than you'd need at your battery bank. Then buck back down to battery voltage. But I understand this may not be practical for all applications.
 

Redpacket

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Feb 28, 2018
Messages
1,433
Definitely keep your batteries together & close to the inverter.
For the solar wiring, just size so you only loose a few % of the voltage.
 
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