I used to have this problem and I went and fitted a 100W solar panel.
When I removed it to tidy up the mounting/ wiring job, I altered my technique so that whenever I need to stop/ slow and I'm EOC'ing, I bump start and DFCO, this spins up the alternator and seems to be enough to keep my battery happy. It always sits at 12.8v in the morning.
I also do my best to minimise loads while the engine is off. I'm still debating on whether the solar panel is going back on.
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