Most grid tie inverters nowadays are transformerless, so you absolutely cannot reference the DC input to ground in any way. It will end in smoke and/or tears!
On Sun, Mar 21, 2021 at 9:43 AM Robert Bruninga via EV <ev@lists.evdl.org> wrote: > Sometimes in the field I have run over 3000 feet of #22 hookup wire to run > several hundred watts from my car for ham-radio camping using > ground-return. > See: APRS SWER Power Distribution <http://aprs.org/aprs-swer.html> > > If your solar is a series string array, then the voltage is approaching 500 > volts. The loss is I squared R so the loss at 500v is less than a 4th of > what it is at 240v. > Lets try #12 wire has a resistance of 5 ohms over 2000 feet, so the loss > from say a 10 kW array (20 amps) is 2000W or a 4th of your power, but if > you get to the 6 cent meter you get double the value so it is a net gain of > 2. But that is 1 wire. If you used a perfect ground for the return. > > THe ground return might be a best case 10 ohms, but then that is in the > wilderness. If both systems are near utilities which are firmly > grounded then most of the current might flow through the low resistance > utility grounds (but making an unsafe condition on loss of grounds). > > Just thinking... > > One other problem is that most string grid-tie inverters do not like to see > any ground current and will trip (though this can be spoofed). > > Bob > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210321/50187d31/attachment.html> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
