Unless you intend to
motor a considerable amount I wouldn't bother trying to get more power out of your 9.9s (my Roger Simpson 12.2 meter is powered by the same motors, and I went with a small but suitably sized
AGM per
outboard for starting but am otherwise independent of ships power). If you're going to
motor a lot it
might add up to being worth considering though.
Since I last upgraded my
electrical system a number of years ago and the technology is continuing to improve I would probably recommend more
solar and
storage than I currently have (four trojan 105-REs in terms of
storage capacity and three 145 watt
solar panels in terms of production, plus two of the first generation Watt & Sea hydrogenerators of which only I run one at a time).
Depending on where you and how you sail
wind generators makes a ton of sense, no sense at all, or somewhere in between. The same could be said for my hydrogenerators, and for the relative weighting of solar to other technologies.
I also have a Yamaha 2800i generator (from my opinion best in terms of still small enough / light enough to carry around but produces enough electricity to run a dust extractor and
single power tool..). I don't use the generator much, but it's great for if I get into a significant energy deficit and I would not go without it (I really beat the hell out of my batteries sailing from
Alaska to Cali because at the time I didn't have a generator or hydrogenerators and solar wasn't enough largely due to storms/clouds/autopilot draw...) But I generally only the generator if I need to run power tools with dust extraction, or want to avoid too heavy of a draw on batteries if I'm using my
electric windlass to pull my
anchor with a relative high load due to
depth or other conditions.
Also, in terms of using a
Honda or Yamaha generator, their DC output is a side thought for
marketing and pretty much a joke. Getting something along the lines of a NOCO
battery charger or any other genuine battery charger which is powered by the generator is the way to go (which doesn't get away from a battery can only receive so much energy at a given time, which is largely dependent on state of charge and temperature, but assuming a reasonable size battery bank will be MUCH more efficient...). Also if you were to go the
route I mentioned of having the small jetski
AGM starting batteries for the outboards to save weight I would highly recommend getting something like the NOCO boost x or other
lithium ion jump starter "just in case" even though the smaller jet ski AGMs for starting the 9.9s haven't been a problem for me.