"While tariffs in this case will not create adequate cell or module manufacturing to meet US demand, or keep foreign-owned Suniva and SolarWorld afloat, they will create a crisis in a part of our economy that has been thriving, which will ultimately cost tens of thousands of hard-working, blue-collar Americans their jobs", Abigail Ross Hopper, SEIA's president, said in a statement.
They are among 1,300 workers who have learned how to install solar panels at Grid Alternatives, a non-profit company that puts up solar panels for people who are economically disadvantaged, while at the same training workers like Alonso how to do the installation.
He added that the tariffs would cause companies to manufacture those items in the USA creating opportunities for "a lot of workers, a lot of jobs".
Mr Trump dismissed fears of a trade war when he signed the order.
The president approved a 4-year tax on imported solar energy cells and panels.
CFRA analyst Angelo Zino said he expected any added manufacturing jobs would be "minimal" given the 18 months to two years it takes to build and ramp up a new production facility and the industry's shift toward automation.
BNEF doesn't expect the tariffs to benefit USA manufacturers, partly because they only last a few years, according to Hugh Bromley, an analyst at the London-based research arm of Bloomberg LP.
Research firm CFRA said it expects the tariffs to increase solar system prices by about $0.10 per watt. It was later joined in the petition by SolarWorld.
Chief of staff John Kelly is a power-hungry nut job, says Trump
I get that, ' Bannon is quoted as having said to Ivanka during one of their spats. That's really small, '" she mentioned. "I shouldn't have done that".
SolarWorld, which pushed for tariffs along with Suniva, is a US -based subsidiary of a German company.
Suniva on Monday said the tariffs were "necessary", while SolarWorld said it was "hopeful they will be enough".
Noting that China would become the world's largest market, with a market size that is potentially three to four times that of the USA, she said China would promote economic and trade relations with other countries through increasing the "cake of cooperation".
Solar manufacturer and developer First Solar supported the tariffs, and is likely to be among the biggest beneficiaries. The chart below shows the USA running a distant second to China in terms of global solar panel sales, with India starting to catch up. "There will only be stock increases for the companies that are in this country".
China branded the move an "overreaction" that would harm the global trade environment.
"With regard to the wrong measures taken by the United States, China will work with other WTO members to resolutely defend our legitimate interests", it said.
Trump's administration has announced a steep tariff on imported washers and solar panels, which include a steep 30% tariff on imported solar panel cells and modules in the first year with the tariffs declining to 15% by the fourth year.
Trump campaigned on a promise to revive the ailing coal mining sector and boost USA production of other fossil fuels as a way to create jobs and bolster American influence overseas.