The weight of a CRX's engine is less then 200 pounds, light enough that I can pick it up off the ground and carry it by my self to the back of a vehicle, you might have another 100 pounds to remove but things like the radiator are small and light, exhaust is pretty light.
Also remember that with lead acid batteries you don't want to discharge them below 50% unless you like buying new batteries and in the winter the useful energy in the battery drops so you need to over size your pack unless you are not easily frustrated.
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