My experience with 6 volt solar unit is that they are under powered.  I 
have in operation two 12 volt units - one a Parmak which is definitely 
pricey and one a Speedrite.  The Parmak is protecting a yard that 
previously suffered bear loss and has been in place for three years 
without incident.  The voltage reading when last checked was a health 
7.8KV.  My experience is that solar works but you have to have an 
adequately sized unit.

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