Originally Posted by colemj
If this is an internally-regulated alternator, the OP does not have to worry about running it for long times in the tropics - it will take care of itself just fine.
The Leece-Neville 8MR series does not have a super-dumb
(eg; Hitachi, Rhone etc.) just a regular old school dumb
one, which means voltage only & no protective temp gradient. This means it will run its little heart out until the battery
bank attains the voltage regulated set point. It also means that if it runs like this long enough it can cook itself.
Originally Posted by Hoghead
Is there any way to de-rate a 200.00 Leece Neville/Prestolite 8MR series 105A alternator?
The goal is not to run it at full chat in the tropics so as to kill it prematurely
I have a 675 AHr Trojan flooded bank so about 70A from the alternator would seem about right
The best option is going to be an external regulation kit with a external regulator such as a Balmar reg with belt-manager
or another brand external reg with temp compensation
Be aware that some regulators simply ping-pong on/off
or on/50% cut
for temp sensing when the high limit has been reached.. A rather kludge
way of handling this. The newer Balmar regulators use adaptive temp compensation
which will find the highest output sweet spot
and you can also use belt manager to save your belt. Very few regulators offer the ability to derate or limit alternator output..
I generally prefer the MC-614 over the ARS-5 because it is designed to drive 15A+ on the field, this means it works a lot less hard than an ARS-5 with a max of about 7A...