I use a bike with a 400Wh battery for errands and social visits daily and charge it once a week running on eco or normal mode. My cargo trike which gets used a

I use a bike with a 400Wh battery for errands and social visits daily and charge it once a week running on eco or normal mode. My cargo trike which gets used a lot less has a 200W panel and I don't even have to think about parking it outside rather than in the shed, just the charge from parking durkng whatever errand is run means it comes back with higher charge than when it left if it is down from the parasitic drain.