/diy/ - Do It Yourself

I live in an RV and get power from my neighbor's garage via 2 150ft extension cords daisy chained 2gether. Around 2-3 other RV's are also getting power in this similar way and one guy has a habit of using power hungry equipment every day in the afternoon. When this happens, every outlet in my RV and my neighbor's garage drops around 10-20 volts in addition to whatever else is already being drawn. This isn't a HUGE problem for me except for that when my voltage drops below 80v my computer shuts off and restarts, and God forbid I try to play a game with my PC and my 3080/5600x starts drawing a lot of juice. Any advice as to how I can get more voltage? Could a UPS potentially fix this?