Higher amp output 24v alternator for 1HZ?

[woytovich]

I'm looking to bump up my alternator output. I'd like to get a little more oomph for if/when I run a 24v inverter that can draw up to 120a:

https://www.donrowe.com/v/vspfiles/pdf/pst_2000_12_24_spec_sheet.pdf

Anything that'll bolt right up? (I know I will want to upgrade some wiring to handle the increased current.)

 

[svsisu]

I'm looking to bump up my alternator output. I'd like to get a little more oomph for if/when I run a 24v inverter that can draw up to 120a:

https://www.donrowe.com/v/vspfiles/pdf/pst_2000_12_24_spec_sheet.pdf

Anything that'll bolt right up? (I know I will want to upgrade some wiring to handle the increased current.)

I installed this 60 amp 24V alternator:

https://www.amazon.com/gp/product/B00B3YW47O/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Not a high output alt by any means, but much better than the anemic 35 amp that is usually paired with a 1Hz. For a 24v high output I would look to marine applications and alternators such as Balmar. Most European yachts have 24v systems.

With out knowing anything about the overall system you plan to install, using your 24v starting system is generally a bad idea for supplying "house" power. A 120 amp draw would be very hard on a battery bank that isn't set up for it. One of the smartest systems I've seen is what @umpqua did with his 24/12 volt system. He has the stand alone, 24v stock setup for starting and running the car, and a 12v high output alternator for powering his house batteries, and everything not related to "running" the truck.

Builds - Portland Troopy Build

Silicone Heater Hose. Few stones left unturned......

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[svsisu]

If you use that alternator I posted, or any larger alternator you will need to change the alternator bracket. Let me know if you need the PN for the larger throw bracket, it's buried some where in my notes and here on Mud

 

[Gun Runner 5]

I don’t recall the model number but I installed a high output Terrain Tamer alternator on my 79 Series.
Perhaps that’s an option for you.

 

[sark]

I don’t recall the model number but I installed a high output Terrain Tamer alternator on my 79 Series.
Perhaps that’s an option for you.

Alternators For 4x4 Vehicles: Rated #1 [2025] - Terrain Tamer

Terrain Tamer provides the best 4WD alternators for 4x4 vehicles. ✔ +50 Years of Engineering Parts ✔ Fast Delivery ✔ All Makes/Models | Order Online

www.terraintamer.com

@woytovich 80 & 100 Amp options for the HZJ75

 

[svsisu]

Alternators For 4x4 Vehicles: Rated #1 [2025] - Terrain Tamer

Terrain Tamer provides the best 4WD alternators for 4x4 vehicles. ✔ +50 Years of Engineering Parts ✔ Fast Delivery ✔ All Makes/Models | Order Online

www.terraintamer.com

@woytovich 80 & 100 Amp options for the HZJ75

I think those are all 12v alternators. Lots more high output models in 12v vs 24v.

 

[sark]

I think those are all 12v alternators. Lots more high output models in 12v vs 24v.

You're right, pre-coffee post right there

 

[woytovich]

Let me know if you need the PN for the larger throw bracket, it's buried some where in my notes and here on Mud

Yes please

 

[svsisu]

Yes please

Apologies for the extremely late reply, here's the PN for the extended throw bracket.
1638117020

You likely have found it by now or moved on to other projects

 

[woytovich]

So reviving this thread in hopes that 24v 100a (and up) alternator options have materialized... anyone have any additional input on this?

 

[TreadingLight]

What kind of load do you plan to put on that inverter? That's 2400 watts - you could boil gallons of water, dry your hair, and microwave a turkey all at the same time without drawing from the battery.

All joking aside, I have a 100a 12v alternator which is pretty big in the 12v world. A 50a alternator @ 24v would be the equivalent.

Depending on what you want to run off the inverter that may be more than sufficient.

 

[woytovich]

I am not sure but I THINK my 1HZ alternator is something like 35a (at 24v). I got an overkill/ higher watt inverter to have cushion over my expected use, which at the moment is just a 1000w electric kettle, and for the "maybe" need in the future (plus it was on sale)

 

[TreadingLight]

The inverter may be oversized which is fine - it's the loads (and their duty cycle) that really matter.

Out of curiosity, which inverter is it? I assume it takes a 24v input and has a 110 output? Or is there a 12v house battery in the mix?

 

[woytovich]

(It was on sale for less than this when I bought it)

 

[TreadingLight]

OK, so this is all being powered off your vehicle 24v system.

If it were me, I wouldn't try too hard to find an alternator that could power the inverter at full load. It will be hard to find and will be way overkill.

Instead I would consider the load, the duty cycle, and the capacity of your battery.

For example, if you were to run the inverter at full tilt, making hot water for a dozen cups of tea, the blender for margaritas and the microwave for ramen all while charging a dead laptop as you dry your hair, you might hit 2500 watts but only for a few minutes at a time.

Your batteries (if sufficiently cabled) could make up for any deficit in what the alternator could produce.

Then when the loads ramp down, the alternator can recharge the batteries.

So if you ran a 2500w load for 10 minutes, and a 50a alternator is producing 1200w, then your battery has to provide the other 1300w for 10 minutes, or 1/6 of an hour.

((2500w-1200w)/24v)*(1/6 hour) = 9aH

It wouldn't take your 50a alternator long to replace that. Even a 35a alternator wouldn't take too long if all it is doing is running the engine. Turn on your heater and bright headlights and it would take a little bit longer.

Just don't run the winch at the same time!

The example is simplified and doesn't consider efficiency and cable losses and such, but it gives a sense of how to look at the whole system.

 

[woytovich]

Thanks so much for that breakdown. I think I'll be fine!

 

[LDowney]

So reviving this thread in hopes that 24v 100a (and up) alternator options have materialized... anyone have any additional input on this?

Mark,
For your consideration, checking on alternators in Coaster buses equipped with 1HZ (or similar) might yield what you are seeking.

FYI The heart of my BJ70 is now a 24V 15B-FT out of a Coaster bus. Earlier this week, I took the alternator off and took it to a rebuild shop. They put it through its paces and it checked out fine. The tech also ran max performance tests because I asked what the capacity was. The 15B-FT alternator maxed out the test equipment/machine at 120 amps. (I failed to ask what the rpm of the test was) The technician projected that the alternator max capacity was probably in the 150-180 amp range.

Based on this experience, my thought is a similar alternator from a Coaster bus may have the performance capability that you are seeking plus additional margin for confidence in a long life for you.

Good luck

 

[woytovich]

Mark,
For your consideration, checking on alternators in Coaster buses equipped with 1HZ (or similar) might yield what you are seeking.

FYI The heart of my BJ70 is now a 24V 15B-FT out of a Coaster bus. Earlier this week, I took the alternator off and took it to a rebuild shop. They put it through its paces and it checked out fine. The tech also ran max performance tests because I asked what the capacity was. The 15B-FT alternator maxed out the test equipment/machine at 120 amps. (I failed to ask what the rpm of the test was) The technician projected that the alternator max capacity was probably in the 150-180 amp range.

Based on this experience, my thought is a similar alternator from a Coaster bus may have the performance capability that you are seeking plus additional margin for confidence in a long life for you.

Good luck

Sweet.... thanks Larry.

 

[woytovich]

Relevant info here:

24v Alternator - Troopy/Coaster Bus

The Troopy has been mostly dead since I took delivery, except for a couple jump pack starts to move it in the driveway. Today I put two fresh batteries in it and fired it up so I can see if the alternator is putting out a charge. Nothing. No change in voltage. First step is going to be to take...

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