These inverters, which are essential components that convert direct current from solar panels into alternating current usable by the electrical grid, were found to contain undocumented cellular radio devices not disclosed in product specifications or technical documentation. Power inverters-essential. . U. energy officials have launched an investigation after discovering unauthorized communication equipment embedded within Chinese-manufactured solar power inverters connected to critical infrastructure grids across the country. They are also used in batteries, heat pumps, and electric vehicle chargers. While inverters are designed to allow remote access for updates and maintenance, utility. . These undisclosed tools could allow remote shutdowns of solar inverters, posing a risk of power outages. But that reliance may come with a serious risk.