‘It’s doubtful if any amount of solar power will fully recharge liveaboard batteries during the winter’
If you did not read the sentence that followed in an answer I gave about solar panels in the June issue, you might think that a 60 to 100-Watt panel would keep your batteries charged, and that all a liveaboard boater needs is a 60-100W panel. But unless you are exceptionally frugal with your electricity consumption, nothing could be further from the truth.
Even a 40W panel will probably recharge your batteries while you are away for a week or so unless you leave an electric fridge turned on, and will easily make up for the batteries’ self-discharge if a boat is laid up over the winter.
However it’s doubtful if any amount of solar power that fits onto a narrowboat will fully recharge a liveaboard boater’s batteries during the darker winter months.
My advice for liveaboards is to fit as many panels as you can and use a quality MPPT controller to maximise their charge, but expect to have to provide additional charging at times dirng the darker months.