I think it's only a 2amp. I calculated what the expected draw should be then rounded up to the next fuse capacity I had kicking about.
I did worry a little about heat build up with the electronics being potted (the original adaptor had some vent holes) It hasn't been a problem though. I think the potting compound may have some "heat sink" properties.
Although I say "hard wired" my electrical bits connect using the plugs that come with an Optimate type battery tender. They are also the same plugs and sockets that are used for radio controlled car batteries so are easy to get.
I have also made up a lead for giving the battery a boost of another vehicle or helping someone else.
It can be a bit of a struggle finding out-of-the-way places to fit things away from heat, dirt, damage.
BYT
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