Be careful - documentation issue for 3.6kw Hybrid Inverter
I have a SUNSYNK-3.6k-SG01LP1 and the QR code on the right takes me to https://www.sunsynk.org/_files/ugd/52fa1b_7e4f8c092f0d4b1f94da08e8f74d96cf.pdf for the manual. There is also a newer 1.6 version of the same in the manuals download. Both say they are for a SUNSYNK-3.6K-SG01LP1 however the model in the diagrams in this document is very different to the SUNSYNK-3.6K-SG01LP1 and crucially has the positive and negative battery connections are the wrong way round. Sunsynk say you can damage the inverter if you get the battery connections the wrong way round.
Those manuals show this
Where as the actual insides of a SUNSYNK-3.6k-SG01LP1 and actually the case look like this from the manual for the SUN-3.6/5/6/7.6/8K-SG05LP1-EU. Notice the offset battery power connectors with the positive on the right. Also the DC isolator switch on the left that mine has and the 6 connectors on the right for AC vs 9 on the picture above
I have tested the positive and negative battery connections and they are currently showing +12v on the right connector with no battery connected (on order but delayed). I am not sure what else is wrong in the manual but just be a little careful