September 22, 20241 yr On 2024/09/18 at 12:43 AM, burgduino said: Since the inverter does not have a dry contact, is it logical to assume it has the internal relay for PE/N bonding in battery mode? No. The two relays are not related. Usually, if the inverter automatically connects AC-out neutral to earth, you should find with nothing connected to the inverter that AC-out neutral connects to earth, but AC-in neutral does not. All Axpert inverters since about 2015 have this feature, but your diagram does not look like an Axpert inverter. I would not use an RCD at the input of the inverter, due to the high likelihood of nuisance tripping. If you must have one for whatever reason, use one with a higher trip current than the usual 30mA. Definitely use an RCD on the output, as your diagram shows.
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