Good evening, Everyone

I'm planning to connect a 3rd Fivestar 8kVA inverter in parallel.

I need to know my wire size from the 3 inverters to my EL in my Main DB.

Can I run a 6mm2 cable for each inverter from there AC Breakers to the Main EL or does it need to be only 1 cable of a certain size?

Need some clarity please

From the inverter's side a 10mm² per inverter could work. However, what is the breaker rating you are landing on? If it is 63A, one 16mm² cable will do.

Hi frivan

Thanks for the info. I will be using a 63A EL. House is already off grid so no supply from utility to inverters.

I was also looking at 16mm2 cable, but they are costly. Maybe someone know where in SA I can buy a 20m cable.

51 minutes ago, Lourens1975 said:

Hi frivan

Thanks for the info. I will be using a 63A EL. House is already off grid so no supply from utility to inverters.

I was also looking at 16mm2 cable, but they are costly. Maybe someone know where in SA I can buy a 20m cable.

Lite-Glo in JHB
16mm2 - R56.50 p/m
https://www.liteglo.co.za/product-category/general-purpose-house-wire-per-meter/page/2/

I buy from them all the time and I am in Cpt :)
Best prices and quick reliable delivery.

Good evening @Lourens1975

It all depends where the inverters are installed and where the Main DB is located and what environment the wire or wires or cable or cables are exposed to, also remember that with inverters running in parallel it is always better to have the cable protection for the inverters output as close to the inverter as possible and it is advisable to have an Isolator as well as a MCB for each inverter output in a single DB.

If the cable protection for each inverter's output is in a single DB then there is no problem later on if you want to run 1 or 2 thick wires or cables from the DB to the Main DB or separate wires or cables for each inverter to the Main DB. If 1 or 2 thick wires or cables are run from the DB to the Main DB then the outputs of the MCB's can be combined and fed to the outgoing wires or cables.

I distinguish between wire and cable because a cable consists out of multiple wires and it is important to know the difference. Loose wires that are used in the wiring of a premises are called GP Wire, Surfix and Twin and Earth are made up out of GP Wire and therefore it is a Cable and then you get SWA - Steel Wire Armoured which is also made up out of GP Wire so that is also a cable. The operating environment for each of these above mentioned types of wire and cable are different.

Kind Regards

GerhardK83