Hello Everyone

I have an Sunsynk 8KW with an 30KWH Hoppecke bank (came from my previous installation)  Installed running my entire House (townhouse) my system works perfectly, I had a electrician here installing an small aircon and he had some questions regarding my Installation( which was done by a reputable solar installer) here are the Questions/concerns he had,  I just want to get the Hive Minds Opinion on this

1. Single pole 250A Fuse from Battery Bank, He reckons it must be a double pole

2.My entire house (except the Geyser, and two 18000BTU aircons)  are running on the Inverter output and the Geyser and aircons are running on the AUX output of the inverter, this works very well because the Aux output switches off when ESKOM dies which doesn't drain the batteries unnecessary. but now the ,concern is Both the Main inverter output and the Aux output goes to my house DB So the top row of my DB is the Aux output and the bottom row is my Inverter output, He reckons that they need to be 2 completely split DB's .....

3.EARTH Neutral bonding has been done via an contactor  and clicks in when the inverter goes online he reckons thats completely illegal, something to do with Bonding is not allowed after the Municipal meter.

Any opinions welcome !!

Quick question: How many Solar installations has he done? 

In the SANS 10142 we require + & - poles to be fused, not just a single pole. There is no specific requirement to split the AC DB between Essentials & Non into a new DB it's more of a good practise thing & leaves nothing to the imagination as far as neutrals are concerned. 

You need the Neutral to Earth Bonding for the Sunsynk or Deye otherwise  Afraid you have a floating earth. Not safe at all. 

18 minutes ago, Steve87 said:

Quick question: How many Solar installations has he done? 

Yep, the learned  Qualified Electrician makes a potentially wild statement re the automatic earth bonding . Yes  the relay is probably free wired onto the input grid (click when grid on) , then the installer has probably wired a rest contact to perform the island bonding on the nrayral. Which is not only correct, but super important. 

In many an Electrician's defense, solar circuits and methodologies are out of scope, but then they should investigate. 

Edited January 14, 20232 yr by BritishRacingGreen

Thank you for Answering

He reckons he has done plenty, and also he also said that Mecer inverter is much cheaper and does exactly the same job, I just Laughed... I have done some reading up on the Fuse and what i gather for a few different sources they reckon that the positive must go an fuse and the Negative must be an Metal link, something to do with voltage referencing.

Regarding the DB's I reckon its done correctly because in essence the essential an non essential is coming from outputs on the inverter, If my ESKOM feed was still present in the DB running the geyser etc and the Inverter returning to the dB running the Plugs and Lights that would have been Illegal. The Bonding of the Neutral and the Earth make complete sense just going to leave that at that.