The biggest problem with a diesel in winter is just pure cranking power also with adding a trickle charge from the solar panel you will also slightly warm the batteries so they will perform better 2 fold.
Solar panel engine block heater.
Hypothesis we can convert the conventional energy being used with the engine block heaters to a solar powered engine block heater.
But the 1 5kw turned on an hour or so before start were enough to guarantee a start.
I would think just use the solar panel to charge top off the batteries would be more then enough for 85 of the situations you run into.
Quote i realize that running a regular block heater is a no go given the power consumed and like i said in the op just getting the engine up to a 10c or 15c temp would suffice.
All you need is 2 things to make it.
Video shows how to set up a small off grid 12v desktop air heater.
Unit is powered using only one solar panel.
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Question is there a way to convert energy being used by the engine block heaters to a more efficient and renewable source of energy.
Order engine heater block universal for your vehicle and pick it up in store make your purchase find a store near you and get directions.
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The block heaters i used on car v8s were probably a lot more efficient than the 1 5kw external heaters that circulated the coolant.