I using this setup.
My solution was… build first solar flower to get access to IV machines, very cheap and easy at beginning (only simple materials like tin iron and silicon). This ore processing multiblock machines not using to much energy reason is this machines working only few seconds
when process ores, so solar panels help me to build higher tier processing line then I added diffirence source of power to my main battery.This setup working perfect on IV tier, cover factory 10x10 chunks