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skinny
GoatandTricycle
You have the best perspective having done it both ways.
But 5% sounds like a massive difference - half a day. How does that break down?
There is a learning curve with batteries. On TCR 2016 I made a few mistakes. I didn't take enough power banks: I only had two so I bought two more at a supermarket in France. And I used crappy little individual chargers, instead of a good one that can charge 4 things quickly from one socket, so one hotel room in Bosnia didn't have enough sockets so I couldn't charge one of my batteries properly. And a couple of my wires were shite so I could only use certain wires to charge eg my phone.
But for IndyPac I'd fixed all that, got the right kit, knew how much power I needed and had no problems doing an all-nighter and lots of other night riding on battery lights.
I reckon not using a dynamo saves me a little bit of time but nothing like as much as 5% or half a day. If it's 6W, then thats about maybe c.5% of my average power, so (cube root) 1.7% of my speed = about 0.33km/h, and I might be riding 16 hours per day, so more like 1% or 2-3 hours over the TCR.