Who makes the most “bulletproof” 12v fence chargers?

Hi guys,
We’re moving our honeybee business to a location that has a high bear density, is off grid, and fairly dry ground. We’ve been advised to get a 30+ mile charger (energizer) that can operate a separate alternating ground and hot wire setup instead of relying on ground propagation through a typical grounding rod. We currently live in a wet climate so this is a new type of setup for us. Speaking in terms of sheer performance and reliability, is ParMak still one of the best out there? Because the cost of a failure could be in the thousands, we’re not considering budget, fancy features and doo-hickies, or anything else aside from reliability and a hard hitting spark.

Many thanks,
Stephan

I've used ParMak for years and am very happy with the performance and durability. I don't have a problem with bears either but set up as you indicated, bypassing the grounding rod for a ground wire and just big enough to enclose some hives, I'm sure mine would deliver a noticeable bite. ParMak is the only one I've ever used though so can't say if there might be a better one.

I've tried three or four types of the solar chargers, but the only ones I'll spend my own money on are the Parmak  12volt!

Just wanted to post a quick update. Went to buy a 12v ParMak online and noticed numerous reviews concerning longevity issues with the newer parmak 12V units. Did a couple hours of research (the people who fix these things for a living are invaluable sources of information) and found that Gallagher is a leader in terms of reliability. Hope this info helps someone else in the future.