Wiring a dozen 2v batteries in series for 24v sounds like a lot of work plus a lot of extra connections to cause problems.
I've seen it about as direct as you can that cleaning panels will increase out put. More then once I've cleaned a panel on a solar pump and either have it start running or...
How many solar panels can you buy for what a wind system costs?
More panels will give you more collection area for lower light conditions, there will be some system capacity limits on this. The sun will shine, the wind might blow.