W0AAT - maybe you had issue's with the keyboard , or ? , but your math is incorrect - 4 x 12 = 48 , not 80 ? The voltage in solar panels do not make for weight [ at least directly ] wattage is more directly related to weight . WF9Q - Just to inform others & trying to stay closer to the facts on solar , inanimate object - can not like or dislike . Any panels sold without a diode [ to keep the panel from discharging at night ] are almost by definition cheap chineeze junk , this seems to be getting close to a new norm [ because of the importation rules being ignored ] , before generally all the American manufacturing gave up to the chineeze , I never found a solar panel without a diode . On the other hand , with most manufacturing coming from China [ China can & does make quality , when we are getting screwed I use chineeze to label ] , as an example high end products like Honda eu2000 generators have been made in China , but then the chineeze steal the idea , make cheaper garbage , same with many other brands . Just trying to keep some of facts back in the alternative energy subjects , solar does work , along with other sources , even in snowy winters . Having been in the field for some number of decades , I am a little frustrated at the lack of addressing RFI in the industry , I have inquired from my sources and the options have been mostly they do not know and only one brand [ doggy dew , do not remember ] as having a quite product , generally speaking there is no such thing as noise coming from a solar panel . I say generally because of over time there have been so many changes and I have not checked on each , some manufactures even made an inverter that was very small and attacked to the back of solar panels , haven't seen these in some time . A lot of complaints [ if not most ] come from people trying to cheap out , buy from amazon , harbor freight , etc. One way to help find quality , is to shop for inverters with terms - off-grid almost always has a battery charger , on-grid has grid disconnect , a battery charger is an option . Most of the stand-alone inverters are not the quality units . Most of the places I use to shop , no longer are out there , or at least buy the same name and finding the known quality brands of solar panels [ can not say , not enough time to prove ] there may be good China made [ only time will tell ] but the pricing is so low - this is why you can not find non-chineeze brands . Here is just one of the sources for good pricing https://www.wholesalesolar.com/power-inverters funny how there is very little competition with inverters , most of the inverters on this site are of the quality type . One thing I have found & suspect with the China / chineeze stuff is , they sell everything under one brand and in such a way that you have to convert at least the connections , and maybe more to combine other products - they sell systems and made & sell in such a way that there there is no option to mix & match different components to build a system .