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Next door has had a system installed.
The drawing the company that installed it shows a D.C. Isolation switch is fitted between the batteries and the inverter.
The Growatt installation manual shows a switch fitted between
battery and the inverter.

No switch has been fitted.

The technical department of the installer company says that one is not required.
They say the D.C. Isolation switch for the P.V. Panels also isolates the battery. ?????????????

The technical department CANT BE WRONG. ??????

Any one else got a GROWATT SPH 3600TL with no battery isolation switch fitted. ?

Imo, it's not an OR situation. Surely they both need insolation?

Looking at this, PDF page 5, document page 4
https://www.ginverter.com/upload/file/S ... 202212.pdf
manufacturer's instruction's require a breaker switch.

Also, it was not supplied per the quote.

The technical departments thoughts are therefore irrelevant.

More relevant questions are, should there be two switches, one near to the inverter and a second near the battery, and whether they should be isolation switches, ie switching off when there is no load, or breaker switches, ie switching off (without arcing) when there is maximum load.

IIRC a battery isolator is also required by the IET Code of Practice. And this is incorporated by reference in the MCS Standard and also I think in the Part P regulations. So the customer can threaten reporting the installer to the MCS (toothless!) and also Building Control.

Mine is combined with a DC breaker built into the BMS module atop the battery stack otherwise I would have fitted a big rotary one.