I have 2
One is on my z and one on my Harley.
My Harley has it on year round I only take it off to ride then when I get home it goes back on.
But to answer your question yes they are very safe b/c they charge the battery to full charge then turns off,and as the battery discharges it turns back on to charge it back to full.
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2013 ZL1
754 rwhp 747 rwtq
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