And he goes and finds that moneylender's grandson and explains the 'hiring him' condition on the loan, hires him, and sees about getting raw materials and a workspace.
Four days later he has a miniature generator on wheels that will take heat from a woodstove under it, and a long string of electric lights. He rents a wagon and drapes it in brilliant light and drives it around the city to advertise this new product.
When he has a decent crowd he launches into a sales pitch about oh how much brighter these are than candles, and they don't make smoke, and you don't need to change them every few hours, all you need to do to light an entire mansion is keep a fire going, who would like to have them installed in their building?
While he starts working on radios, he investigates buying an empty lot and building a large plant from which he can distribute power to homes without having to sell them all a generator. Are there any inconvenient laws or bureaucracy that threaten to interfere with this project?
He has a wagon of gear including a generator to hauled their compound and tries to find Kaja.
Kaja comes out with some other paladins in about half an hour. "Hello, Nicholas. What brings you here?"
"Your communication devices are ready. You can call me Nick, by the way. To make them work best I will need to place equipment somewhere high up in the compound, and the generator that will power your batteries requires a fire so it should ideally be shielded from the rain but in a place that is in no danger of catching fire. I can also install candle-less lights, if the Bright Sister wishes."
"The lights would be most useful in the kitchen, probably, and perhaps an empty stall for the generator, the stable being made of stone and needing to be kept warm anyway? Unless it would disturb the griffins and winged horses. The tallest point of the compound is the temple spire but I don't think you should put things on it; perhaps the top of the novices' dormitory."