Exposure is the way to go just to get rid of the battery packs and faff.
Diablo plus piggy back on medium should last the night and a six pack on medium should last the night, plenty of light for solo pace too.
When I did a 24 solo, I had the benefit of being crewed by Rob Lee and had full access to his kitty of lights. I was blowing through Six Packs and Diablos on full power – nice luxury but getting on for a couple of grands worth of lights! 8O
Did the WC2C on Exposure lights, Six Packs and Diablos with Piggy Backs, fitted and didn’t touch them except to turn them off in the morning (and on again the following evening when a 36 hr finish was on the cards :oops:)