Currently I have a client who want to install solar panels on there existing system. It a Kodak king 5kw with a 50ah lon battery, this system only back up a very small portion of the house, basically 3 fringes and the lights. I want to install 4 555w solar panels, 2 strings with 2 panels per string. So my question is it legal to use this y splitters in South Africa or not?
 

https://www.inverter-warehouse.co.za/products/mc4-2-1-t-branch-connector-pair?variant=15355367850035

 

 

 

If you are staying within the products specs then all should be good to go.
Make sure to do all the correct calculations according to the specs of all the products as a combined system then there should be no issue afaik.

Those in your link is T-branch connectors and are legal to use. The Y-connectors are also legal to use as they are rated at 1000v 30 amps. Below Y connector.

These are ok as long as you don't create more than two strings in your array. Any more parallel branches requires fuses per branch to protect each branch from excess short circuit currents that could result in bad things (e.g fire)

 

These are ok as long as you don't create more than two strings in your array. Any more parallel branches requires fuses per branch to protect each branch from excess short circuit currents that could result in bad things (e.g fire)

The y-connections are rated at 30A. Why can't they be used for say 4 branches if the panels can only say produce 5A each which will be 20A? Why the limit of only 10A for 2 branches? 

Check the max fault/fuse circuit rating of the panels in the data sheet. That is the number you need to ensure you do not exceed if there is an electrical failure of a panel in a string that could cause current from the other strings to flow in reverse through the faulty string.

If the fault current isn't specified, stick to not exceeding the panels short-circuit current rating - hence normally the rule for fusing above two parallel strings.

Edited September 28, 20232 yr by AlexTZA

 

Check the max fault/fuse circuit rating of the panels in the data sheet. That is the number you need to ensure you do not exceed if there is an electrical failure of a panel in a string that could cause current from the other strings to flow in reverse through the faulty string.

If the fault current isn't specified, stick to not exceeding the panels short-circuit current rating - hence normally the rule for fusing above two parallel strings.

I use these inline fuses in conjunction with T or Y connectors 20 amp per string