25 ATHigh-output brushless alternator · Cradle mount

Only if you have one. Otherwise choose below.

Find your 25 AT

ALMOTT 25 AT brushless alternator, Cradle mount25 AT, ductless25 AT, with 3" duct25 AT, with 4" duct25 AT as a Niehoff replacement25 AT as a Niehoff replacement, rear view

1.Voltage. Choose your system.

2.Output. Choose the current.

3.Filter. Do you need noise suppression?

4.Air intake. Ducted or ductless?

5.Fan. Bidirectional or clockwise?

6.Your part number. Everything in one line.

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Warranty

Technical parameters

System voltage
V
Rated output
A
Output at 2 000 rpm
A
Max power
kW
Max efficiency
%
Weight
kg
Max speed
6 500rpm
Temperature limit
°C

Options

Noise-suppression filter
Air intake
Fan
Isolated ground
(standard)
3D STEP file, sent by e-mailDatasheet (PDF), sent by e-mail
Request this number
All 28 part numbers
Part numberSystemOutputFilterAir intakeWarranty
121721-11512 V400 AnoDuctless2 years
121721-12512 V400 AyesDuctless2 years
221711-26524 V350 AnoDuctless3 years
221711-26624 V350 AyesDuctless3 years
221711-26124 V350 AnoDuctless3 years
221711-26324 V350 AyesDuctless3 years
221721-23224 V450 AnoDuctless3 years
221721-23124 V450 AyesDuctless3 years
221715-24424 V450 AnoDuct 3"3 years
221715-24224 V450 AyesDuct 3"3 years
221716-24324 V450 AnoDuct 4"3 years
221716-24124 V450 AyesDuct 4"3 years
221716-23224 V450 AnoDuct 4"3 years
221711-21524 V550 AnoDuctless2 years
221711-22524 V550 AnoDuctless2 years
221711-21924 V550 AnoDuctless2 years
221711-22924 V550 AyesDuctless2 years
221716-21224 V550 AnoDuct 4"2.5 years
221716-22224 V550 AyesDuct 4"2.5 years
221716-21724 V550 AnoDuct 4"2.5 years
221716-22724 V550 AyesDuct 4"2.5 years
221726-27124 V650 AnoDuctless1 years
221726-27224 V650 AyesDuctless2 years
221726-27324 V650 AnoDuct 4"1 years
221726-27424 V650 AyesDuct 4"2 years
521721-51148 V300 AnoDuctless2.5 years
521721-51248 V300 AyesDuctless2.5 years
521721-52248 V330 AyesDuctless2.5 years

What is inside

Built the ALMOTT way

Brushless, hairpin statorNo brushes to wear; rectangular copper conductors fill the slot for high output at low speed.
High output at idleUp to 24 V 365 A · 48 V 190 A at 2 000 alternator rpm.
High-temperature bearingsRated for the engine bay: 125 °C on 24, 48 V.
Isolated groundIsolated-ground terminal on every version; the fan cools in both directions of rotation.
IP23, air-cooledProtected against spray; ductless or duct 3" or duct 4".
48 V for lithium banksThe 48 V versions charge LiFePO4 banks directly, 300 or 330 A.

Dimensions from the drawing: overall length 396.2 mm, Ø 260 mm, mounting 133.4 mm, 17-tooth spline. Max speed 6 500 rpm.

Not sure?

We choose the number for you

Tell us the vehicle, the system voltage, the loads and the battery, and we pick the right version.

Ask us to choose

  • Vehicle and engine: make, model, alternator speed at idle
  • System voltage: 12, 24, 48 V
  • Loads: what runs at idle and at speed
  • Battery: lead-acid or lithium, capacity