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I had one for my Porsche, and it was essential to keeping the thing topped up. I think it was made by Ring.
My Aston needed something more substantial so it got plugged into the mains, via a C-Tek something or other.
Nowadays none of my cars need such frippery. The Citroens divert power away from high-drain things to ensure the starter will have enough juice, and the Mini doesn't have anything electrical beyond the radio presets when it is switched off.
bq
hippy
Has anyone tested those solar battery topper uppers to see if they actually generate any meaningful current that might top a battery up? I swear the one I have does fuck all (and I realise this is Britain and Britain doesn't deserve sun, but still, it's blinking so it's getting something).