T&T: Alternator/Charging Issues

[Kerry Nelson]

You don't mention what main you have or the model Delco alt that your
spinning
but one thing to check is the pulley ratio driving the alt. At 1000 engine RPM
I'll bet the alt is not
spinning near maximum output. Not surprising that you get little charge into a
decent size house bank
after a couple of hours at 1000 RPM. Top engine RPM and top alt RPM must be
considered
when resizing the alt pulley. I have "fixed" two boats with low charging
issues
by an alt pulley change alone.

Kerry

Friday, July 18, 2008, 4:25:53 AM, Craig wrote:

CM> Looking to get information on some alternators and what else is
CM> out there.  My golf batteries can last two days without charging
CM> which is great for a weekend.  But should I stay on the hook
CM> longer than that I start to to show lower voltage (10.5 - 11.0)
CM> and the led indicators on the 2000 inverter board start to flash
CM> red.  The only thing I am using significantly is a 110v undercounter
refry/freezer

CM> I have a 100 amp alternator from Delco that I just put in last
CM> year, but after two hours at 1000 rpm (engine) appeared to do
CM> nothing on the board (Xantrex).  It kept showing 11.0 and the LED
CM> lights were still flashing red.  I even tried it at 1500 rpm for a
CM> 1/2 hour and nothing appeared to be indicating a re-charge.  I am
CM> not even sure how long it needs to run in order to charge the bank
properly