I would think if the devices meet the tested Class B spec then no advantage. Engineers can design filters for the Class B requirement. The radiated RF may be different between two identical specced inverters of different topology. Even that can be designed in, if there is a requirement and it is tested for.
The basic test anyone can do is with a 10 dollar analog AM radio tuned to a weak station. If you can't get 5 feet back from the inverter and hear the station, then you have work to do to suppress the radiated garbage. An XW is about 3 feet if it is installed correctly. My truck inverter which is transformerless, will kill AM for about 50 feet. See what Bob says, my component level engineering is from the 1980's and dated. Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ [1] e-mail [email protected] [2] text 209 813 0060 On Fri, 2 Oct 2020 11:58:15 -0600, Jay wrote: Hi Bob Is there any inherent advantage or disadvantage to non transformer inverters? Jay On Oct 2, 2020, at 11:27 AM, "[email protected]" wrote: This is all great advice. Remember that long wires can radiate RF. PV lines and the array can make a good antenna for RFI as well as the battery lines. I agree with Dave that both of those inverters are more than likely similar. I know that the XW has a good filter on the battery line right where it should be, at the exit point. An additional ferrite toroid core used in common-mode filter hookup (BOTH hot and cold wires run through the center) as close to the unit as possible on AC and DC wires as well as possibly, communications lines exiting the units. Battery temperature sense also, possibly. As for resources, Palomar link that Roy gave is a good resource. Digikey or Mouser might also be a good place to look for both the parts themselves and possibly information. boB K7IQ On 10/2/2020 8:57 AM, Dave Angelini Offgrid Solar wrote: My advice is it is more about the installation and the distance from the inverter, and it's devices from the station location, than the make of equipment. There are other things also that I do to fix noise and interference. My wife is an extra class operator and several clients have visited to get ideas. Most any noise issue can be fixed later, unless you are too close to the source. That said I mainly use XW and I would assume Radian is similar. Below is the spec that XW is test for and has been since 2005. " EMC directive FCC and Industry Canada Class B " Below are 2 of the ways that the issue is defined and measured. So-called "RADIATED EMISSIONS" are picked-up WITH A test-antenna and can come from all parts of the product INCLUDING the cables it uses (power and module interconnects). CONDUCTED EMISSIONS are measured directly as voltages or currents on the cables used by the product. Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ [3] e-mail [email protected] [4] text 209 813 0060 On Fri, 2 Oct 2020 09:35:34 -0600, Mac Lewis [5] wrote: Hi Wrenches, I have a HAM radio enthusiast that needs to replace their off-grid inverter. He would like the inverter that puts off the least interference. I don't know a whole lot about evaluating an inverter for this, but I am reaching out for recommendations. Needing ~8kVa at 48V. Thanks! -- Mac Lewis "Yo solo sé que no sé nada." -Sócrates _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] [6] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [7] List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org [8] List rules & etiquette: http://www.re-wrenches.org/etiquette.htm [9] Check out or update participant bios: http://www.members.re-wrenches.org [10] _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org Links: ------ [1] http://members.sti.net/offgridsolar/ [2] mailto:[email protected] [3] http://members.sti.net/offgridsolar/ [4] mailto:[email protected] [5] mailto:[email protected] [6] mailto:[email protected] [7] http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [8] http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org [9] http://www.re-wrenches.org/etiquette.htm [10] http://www.members.re-wrenches.org
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