Indeed, if they didn't produce all that lag, we would all still be using the basic solar panel and large fields. Solar panels were not designed for compact builds.
I'm sure there's some way of turning a field of solar panels into a multiblock structure, which then only sends out one packet based on the total panels in the field.
it's called CompactSolars and it's in all packs excluding Tech & MindCrack
it creates a single block instead of a multiblock structure and it is as balanced as normal solar panels
http://forum.industrial-craft.net/index.php?page=Thread&threadID=4827
a HV Solar Array produces 512EU but costs more than 512 normal solar panels but because it's a single block it doesn't lag as much as 512 solar panels would
if you build it by hand, be prepared to spend a lot of hours