For all the people complaining that these solars are OP let me just share some numbers.
To make ONE HV Solar takes (not accounting for the transformers needed btw):
5120 Iron (to be made into Refined Iron)
3328 Copper
2048 Tin
4096 Cobble
3072 Redstone
6656 Rubber
1536 Glass and Coal Dust
Now I don't know about you but that is a CRAZY huge load of resources needed and my opinion is that this all balances the mod out.