Busbar Sizing

[Voltageza]

Hi guys

Need a little help in calculating the bus-bar size for a project. (See image attached)

9 x 15000kva Victron Qautro's

4 x 450/200 MPPTs

3 x 60/48 Freedom Won Batteries. 1000A Discharge

The red line is the busbar.

Dark Blue Freedom Won Batteries

Light Blue/Cyan Inverters

Green MPPTs

 

We calculated that a 1000A busbar will do the job but going with 1200A for safety.

 

What are your calculations on this setup please?

Thanks

 

 

JAKE LAYOUT.pdf

[WannabeSolarSparky]

Copper - 50mm X 20mm X length = should give you 1200amp at 52v nominal DC
https://www.allumiax.com/bus-bar-size-calculator

https://www.em.co.za/site/Catalogue PDFs/2020-Charts _ Tables.pdf

Edited September 8 by WannabeSolarSparky

[TaliaB]

2 hours ago, Voltageza said:

Hi guys

Need a little help in calculating the bus-bar size for a project. (See image attached)

9 x 15000kva Victron Qautro's

4 x 450/200 MPPTs

3 x 60/48 Freedom Won Batteries. 1000A Discharge

The red line is the busbar.

Dark Blue Freedom Won Batteries

Light Blue/Cyan Inverters

Green MPPTs

 

We calculated that a 1000A busbar will do the job but going with 1200A for safety.

 

What are your calculations on this setup please?

Thanks

 

 

JAKE LAYOUT.pdf 73.51 kB · 2 downloads

50 x 20mm will work this is what i use 100mm x 10mm you will have to pre order and expensive

https://goldcirclemetals.co.za/copper-busbar/

https://acdc.co.za/terminals-insulators-busbar-supports-flex-solid-busbar/4509-100x10mm-solid-copper-busbar-3m-length.html?srsltid=AfmBOopiimEXBMhohEUDJ0a1FB3aENbgHEddrM228z_nxd5E-nJji8_r

Edited September 8 by TaliaB

[Scorp007]

2 hours ago, TaliaB said:

50 x 20mm will work this is what i use 100mm x 10mm you will have to pre order and expensive

https://goldcirclemetals.co.za/copper-busbar/

https://acdc.co.za/terminals-insulators-busbar-supports-flex-solid-busbar/4509-100x10mm-solid-copper-busbar-3m-length.html?srsltid=AfmBOopiimEXBMhohEUDJ0a1FB3aENbgHEddrM228z_nxd5E-nJji8_r

I take it that the load could be 135kVA and 2600A if inverters operate at full capacity at 52V.

[TaliaB]

18 minutes ago, Scorp007 said:

I take it that the load could be 135kVA and 2600A if inverters operate at full capacity at 52V.

You are 100%correct with common rail busbar for 9 x15kva inverters you will need 101,6 X 25,4 busbar to support full load current of 2600A. Thanks @Scorp007 for the correction. The above size copper busbar will entertain 3000A

[Voltageza]

Hi Guys

Thanks for the input. 
 

Our argument is that at no point of connect 2600A will be drawn. Loads are evenly spread. The highest point drawn will be at the battery connection and that is a 1000A.

It all the inverters were connected together at one point it will be a different scenario. 
 

I also read somewhere that installing the MPPTs between the inverter and not all at one end will also balance the loads. 
 

We arranged a meeting with a engineer to get more clarity. 
 

PS: We order our busbars from Copalcor in PE. 

[Scorp007]

2 hours ago, Voltageza said:

Hi Guys

Thanks for the input. 
 

Our argument is that at no point of connect 2600A will be drawn. Loads are evenly spread. The highest point drawn will be at the battery connection and that is a 1000A.

It all the inverters were connected together at one point it will be a different scenario. 
 

I also read somewhere that installing the MPPTs between the inverter and not all at one end will also balance the loads. 
 

We arranged a meeting with a engineer to get more clarity. 
 

PS: We order our busbars from Copalcor in PE. 

Although it sounds a good solution to say the equipment will be used at 1000/2600A=38% anyone can after installation decide to double the load as the system can do it. Equipment is always installed with a safety margin at full capacity.