I got this for use with a trolling motor and a 35A/h battery. I haven't had a situation where this one saved me, but there was another (50 amp) that actually opened when I was trying to charge a large battery from my truck. I might have been fine without it, but you never know when something is using more power than you think or you might accidentally touch things you don't want to touch. So a backup is always worthwhile (both for you and for me).
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