>  ... why not try Strapping first?


Been there, done that. Bear ripped off the bottom board in pieces. 
Scooped out the bottom brood chamber like a melon.
  As far as bear fence chargers goes, why not use battery powered? I 
have 10+ bear fences set up in my NY apiaries. Solar is expensive, 
and the battery doesn't last forever.

Try the Gallagher B-11, or the Speedright AN-90. Both use either D 
cell flashlight batteries, or 12v deep cycle marine battery. D cells 
last about 4 weeks, but the 12v lasts for several months. Stops bears 
even when they are actively working the yard. Bacon on the wires 
gives 'em a good snoot full.

Both cost in the $110-120 range.
Mike 

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