We are about to replace our old, nearly expired, 420Ah flooded LA battery
bank with new 660Ah bank of AGMs.
To keep them properly charged, in addition to 400W of solar
, we are looking to upgrade the Yanmar
4JH5E engine's stock 80A Hitachi alternator
which, because of alternator
temperature regulation, rarely delivers more than 20-25A into the batteries during extended motoring.
With a large AGM
bank we want to go to the largest alternator that we can fit. After a lot of research
, to keep with a small frame size alternator that we know will fit, it looks like being either the Balmar
AT-165 or the Mark Grasser (DC Power Solutions) Stage One 180A alt, together with a serpentine belt/pulley conversion and Balmar
The temptation is to go for the Mark Grasser on the basis that it is larger, but is there any good reason to go with the lower powered Balmar AT-165?
Assuming both alternators are sensibly belt limited and temperature regulated, is the MG 180A alternator always going to deliver more power that the Balmar, or is the design of the Balmar AT better able to handle high temperatures and therefore in the end able to deliver more power?