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The fuse is Ferraz-Shawmut # A15QS 800 4. This is the cheapest type. You may want other than 800 amps. Pauls controller is limited to 775 amps. I think it would be embarrassing to blow a fuse. I've seen 600 amps recommended. I would buy one spare. They sell a holder. I found that I could hook 3 items together by bolting one to the next. This actually saves money, work, and power loss. The 3 items are the shunt, fuse and contactor. The fuse goes in the middle, on one terminal of the contactor, and shunt. Current shunts are universally interchangeable. They are standardized at 50 mv output. So you can buy the shunt for the current rating or your guage. I have 600 amps. You are more interested in the current in the range of 100 amps, than between 600 and 1000. That is, if you want to maximize your miles.
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