This is the only device that adds a much needed safety barrier between my battery pack and the inverter/charger. If I'm having temperature issues, it protects the rest of my system/cable if something goes wrong. This little device is the little thing that can save me a headache and lose money. It's so easy to install and it gives me peace of mind. This is a small investment to protect a very large investment. It's great value for the price and what it does. 5 stars all day.
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