A big thanks to the Automobile Association (AA) man for explaining to me the difference in car battery charging rates between the actual alternator of the car and a trickle charge system direct to the battery. The alternator is about 20 times more effective than the trickle charger, that's 20 amps v 1 amp at a time or 20:1. There is some time related calculation I could do on this to get an even clearer picture but I'm going easy on myself. I'm 66 and only now learning this basic stuff.
Armed with this knowledge my winter motoring behavior will change, a bit. I was also able to view all the relevant figures on the screen of some magic AA device or other. With the money I've saved I'll likely go to a nearby music festival or perhaps purchase some high quality take-away foodstuffs. In weaker moments like this I'm always tempted by the prospect of banjo ownership but thankfully not this time.
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