if you had a diamond drill why didn't you have some energy crystals?^^
The difference in storage capability between of a energy crystal and a BatPack isn't really that big, so I did the test with the BatPack because that was what I had at the time.
Ye, a miner ~64 deep with diamond drill/OV uses around 500k EU. That is quite a bit. Honestly I have no idea how much a quarry uses in comparison. It's just less fuss putting up a quarry than a miner, with the added benefit of all the "junk" you recycle/EE or whatever you do it.
I'm trying to stick with just plain IC^2 for now (no addons), but thanks. But how do you handle lava/water when using the quarry? Is there something like the Pump that removes it automagically?