photovoltaic solar panels come in many different voltages. the most common are 12 volts, 24 volts, and 48 volts. like batteries, multiple solar panels can be connected together to produce higher voltages, for example, two 48 volt panels connected together would produce 96 volts. the inverter, batteries, and solar panels in a system are usually all of the same voltage. the advantage of a higher-voltage system is that thinner wire is used, which is less expensive and easier to pull through conduit. the disadvantage of a higher-voltage installation is that electric shock and arc flash become more of a hazard, so installations above 48 volts are usually only found in solar power plants or commercial buildings.