The person in the story falls through a plot hole into the early 1800 years. Like, steam engines are still new and ineffective, but industrialization is nothing foreign anymore. Light bulb, car & bicycle are still 80 years in the future, electrical telegraph is 30 years to go. History-wise, the "0th world war" (the seven year's war), is already history, same for the US independence war. French revolution is done, Napoleonic wars are soon to come and to be avoided as much as possible.
For some reason, the person gets a pre-warning, so they prepare. They travel to the best location where google says that there is the minimum amount of war, famine and disease, but the amount of freedom and available work force is sufficient to found an enterprise. Be it some African or american colony or some hinterlands of Portugal, Spain, Colombia... wherever nothing happens, people search for work and neither bureaucracy nor crime actively prevent it.
While they prepare, they also decide that it would be a great way to become rich if the humanity could shortcut the entire coal and oil burn down phase at the same time; so they decide to found an enterprise on electric applications.
He goes to the net and downloads a very good 2020-ish recipe for batteries, for making solar cells and a good dc motor. Prints everything on paper, adds a physics book to the pile and goes back.
Producing a solar powered motor for workshops is the most in-the-face obvious advantageous thing for small scale enterprises like smiths, mills and the like. However, despite the obvious advantage, I am not sure that I am on the right track here.
A semiconductor, any semiconductor, produces electricity as soon as light reaches it's surface. Silicium is cheap today and solar cells are the cheapest energy source worldwide because this material is used in many industries today - but there may be a problem if we have to kickstart the production out of the nothing. On the other hand, if you start it from ground up, it doesn't need to be perfect, it is sufficient if it works at all.
Same for the batteries. The biggest problem had been (and still is) the search for a good recipe. The production is as low tech as anybody can imagine - as long as you can get your hands on the material. Lithium is widely available; cheapest source is Chile of course because there you can find it in very clean form, directly at the surface. But if need arises and money is available, one could get it in nearly every place in the world. The recipe would be some variant that maybe can't store so much like the today's high-end batteries, but instead is very resistant/tolerant to in-current and out-current, overcharge and deep discharge, so that one doesn't need a sophisticated management system.
What would my person need additionally if I take the solar route? What would stop them from building their enterprise? Is that at all a realistic scenario, taking some knowledge and kickstart the solar age at 1800 or would I need a bucket full of other things I didn't think of?