harrow
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A 10/ 20 watt solar in windshield plugged in will do,point her into sun,it should give up to about 1 amps over about 3/5 hrs which will keep batt up.
Trevor I have got one of these,
Solar Powered 12V 1.5W Battery Auto Trickle Charger | Maplin
but these are a complete waste of time and money.