Alternator sizing

WKCOOK · Today, 10:09 AM

Looking to confirm common alternator sizing practice is in S/ST or S/G. I have ready many alternator threads in CR forums, Great information without a defined answer to my question. I utilized Power Master's sizing guide to determine full load at 145A.
What is the prevailing sizing practice?

smaller amperage / lighter alternator to supplement draw from battery?
OR
larger amperage / heavier alternator to facilitate the load while making a pass?

I understand there are personal preferences and difference of opinions. I would like to hear them.
Battery can also be a variable. This site has provided great information on Lithium VS AGM
W

Today, 10:09 AM	#1
WKCOOK Junior Member Join Date: Jun 2025 Location: La Salle, Mb. Canada Posts: 5 Likes: 0 Liked 2 Times in 2 Posts	Alternator sizing Looking to confirm common alternator sizing practice is in S/ST or S/G. I have ready many alternator threads in CR forums, Great information without a defined answer to my question. I utilized Power Master's sizing guide to determine full load at 145A. What is the prevailing sizing practice? smaller amperage / lighter alternator to supplement draw from battery? OR larger amperage / heavier alternator to facilitate the load while making a pass? I understand there are personal preferences and difference of opinions. I would like to hear them. Battery can also be a variable. This site has provided great information on Lithium VS AGM W __________________ 88 Mustang 533 BBF N/A