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--- electrical:12v:alternator [2024/04/26 16:57]
frater_secessus [fuel consumption]
+++ electrical:12v:alternator [2024/04/26 16:58]
frater_secessus [charging current patterns]
@@ Line 113: / Line 113: @@
 See [[electrical:12v:alternator_details#heat|this sub-article]] on alternators and heat
-==== charging current patterns ====
+==== fuel consumption ====
+Fuel consumption for power generation will be greatest when the vehicle is idled.  When charging loads are imposed on a vehicle that is already driving the added cost can be minimal.
+Using the 3.6L [[rv:ram_promaster|Promaster]] with a 40A [[electrical:12v:b2b|DC-DC charger]] as an example, ObvB estimates:
+>> In terms of cost, an average USA price of gas at $3.36, **idling** for 2 hours to produce 1kWh with a 40A DC-DC charger would burn 2 * (2/3 + 0.074) gal = 1.48 gal = **$4.97 / kWh**. If you were going to be **driving** anyway, then the additional cost of turning on a DC-DC charger (using my assumptions) would be about **50c/kWh**.((https://www.promasterforum.com/threads/fuel-consumption-at-idle.103939/post-841876))
+===== charging current patterns =====
   * charging lead chemistries directly from the alternator tends toward

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