Anybody replace their old Motorola Alternator?

[Seawater]

I was advised to replace my old 135 AMP Motorola with a “modern” high capacity alternator with a standard VR.

My old alternator will put out about 40 amps max charging a 400 Ah bank, but it maintains its 14.4 V output.

The modern unit is supposed to create the same voltage, so wouldn’t it push the same current?

Has anyone replaced their old unit with a modern one an seen a dramatic increase in charging current?

John S, did your new engine and alternator result in a big improvement in charging the same bank?

Thanks in advance for any help.

[unabated]

I have 100 amp alternator from “The Battery Shack” in Marathon Fla.
I use a 3 Stage EXTERNAL regulator. I have a 450 amp House bank and it will charge 80 amps at 2200 RPM with the W58.
Alan

— On Fri, 9/26/08, Seawater <> wrote:

Quote:

<.. snip>

Post generated from Pearson424 Forum using Mail2Forum

[RichCarter]

Walter
I replaced the original Mot high capacity alternator that came (as an option) with my old W60 with an industrial alternator. It is rated at 160A. It is very rare for my alternator to put out that kind of current because my batteries won’t accept that much current unless they are very low. So why bother with a large capacity alternator then?

A large capacity alternator gets you to things:

1 – it has a bigger frame and cooling system so it will run cooler and more efficiently. It will last longer.
2 – it will put out more current at a lower RPM than a smaller alternator. In other words, it will charge your batteries at a lower RPM. I can charge my batteries and run my refrigeration compressor at 1000 RPM.

When I repowered, I reused the alternator. Here’s my notes.
http://www.richardcarter.net/repower/AccessoryMount.html

If you are interested in a similar alternator, I can put you in contact with the shop that put it together for me. It should run about $200 not including the regulator.

—
Rich Carter

---

Original message

---

<.. snip>

Post generated from Pearson424 Forum using Mail2Forum

[Anonymous]

We added a 150 amp alternator and had it wired to charge the house batteries, two sets of 6V 220 amp hr golf carts, and the windlass battery, a class 27. The old 60 amp alternator is now dedicated to charging the starting battery, a vary large HD tractor battery. We went all summer without needing to run an equalizing (de-sulfating) cycle until lay up. We did do a lot of motoring this season against head winds going from Maine to New Jersey, but we had similar success last season. We live on the boat all summer for 3 months or so.

Norris Larson on Easy Reach, #206

— On Mon, 9/29/08, <> wrote:

Quote:

<.. snip>

Post generated from Pearson424 Forum using Mail2Forum

[Author]

Posts