It's actually quite balanced. For the hv array, it costs 3 stacks of copper, 4 stacks of insulated copper cable, 4 stacks of planks, a stack of refined iron, plus an hv transformer and 512 solars.
yeah but even then it's as much energy from a nuclear reactor that takes up 6 slots and will explode after rought 37 minutes of use and then would have to be shut down for 113 minutes to cool back down, and nuclear reactors reaquire a constant fuel source, once a solar HVSolar Array is made then you can use that to exponentially increase your solar farm untill you get like 8 of those hv solar arrays and never have to mine or do anything for another day in your life, even with reactors you have to hunt down uranium since you can;t make it with UUM, and once you get enough solar panels even a Nuclear Reator would become trivial withough the 512 block space requirement blocking out all your sunlight. the cost of mass producing solar panels if eternal darkness over your house forever. better set up a good anti creeper defence if you get a 500+ solar panels