Hi Mike It will charge at a higher rate, the charge acceptance rate of your battery bank could safely be up to 25% of your bank capacity as a guide, so the 110 is well suited. there is a HOT rating for an alternator which on most is lower than the nominal rating. Also, most alternators are for automobile use at an upper limit of 14.2, they seldom run high loads for any length of time. Your stirling will push the voltage up to around 15V from the alternator depending on battery type and cable loss. this also lowers max output but so you should still see a healthy output.
The charge will also drop off as the battery charges up, this is normal and your smart reg does a good job of charging to near capaicty if given time.
Joe
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