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Well I will be a bon of a sitch. The printer cable from the factory did work. I don't understand what they did. I need to go a long distance to my desktop. Thanks Harakiri37 for the heads up.

Maybe not since I am a cheapskate. Thanks Times

Version 3.0 on Growatt's site can be downloaded here. On the Features page it has the correct 250V https://www.ginverter.com/Off-Grid-Storage-Inverters/44-639.html And so does the older one on Watts247. I don't know why the one on Signature Solar is wrong.

I have the SPF 3000 LVM - ES Not working without battery (batteryless) min PV voltage is 120v The inverter show 134v input from panels but zero Amps I have 6 100 W panels in series. isc 5.21A voc 24.3 v Can anyone tell me how many panels I would need to operate without a battery?

No times, when I added an extension to the factory's cable the COM disappears. I emailed growatt and they forwarded me letter to usaservice@ginverter.com But I have not heard back from them.