Have a look at the Tohatsu 30hp; its the biggest hand start/electric start you can buy. It will start without any battery, very useful feature., and of course also has an alternator to charge batteries.
I have the Tohatsu 6hp extra long shaft ' sail drive' that's designed to push along big boats at displacement speed . very good little engine, lots of grip in the water and weighs only 25 kg.
Caveat: im nearly 60, reasonably fit, but I find that I'm only just capable of lifting an awkward 25kg outboard up onto the aft deck and out of the dingy.
if you're going bigger than 25kg you'll need help to lift it; so go as big as your dingy will allow on the transom or stick below the magic max liftable weight.
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Peter.
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