Wolverine engine heaters ?

No ideas about worth of engine heaters. However if you do go 12v pads powered by solar panels not via batteries you need to get the wattage (resistance of the heater) to match the wattage (internal resistance of the panel) This is the principal of max power point (tracking). (but you are not tracking ie keeping up with changes)
So a 12w pad ie 1 amp 12 ohms resistance will best be matched to a solar panel of about 20w. hopefully giving about 14v at 1 amp. Probably less in winter sun. If you go more solar power ie 40w you could overload the pad with closer to 18v at 1.5 amps so near double the power of the pad.
Now a 50w pad as offered will take 4 amps at 12v ie 3 ohms, so would need about 80w panel. Any smaller panel ie 20w will give 1 amp but voltage would be dragged down to 3volts and only 3 watts of heat delivered. So it is all very tricky and these calculations are based on full bright sun. Less of course in UK winter. A panel too big could kill the heat pad a panel too small would be ineffective in a disproportionate way.
So alternative is to run the heat pad off 12v battery but you would need a low volt disconnect (VSR) if relying on solar 12v battery charging to avoid killing the batteries.
Something for you to think about ol'will
 
You might be better off by wrapping your engine with a nice blanket. It takes no power, costs little and reduces the temperature changes around the engine. This cuts down condensation and thus stops the rusting. I favour polyester garden pond liner!
 
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