20 ATBrushless alternator · J180 mount

Only if you have one. Otherwise choose below.

Find your 20 AT

ALMOTT 20 AT brushless alternator, J180 mount20 AT, ductless20 AT, with 2.75" duct

1.Voltage. Choose your system.

2.Output. Choose the current.

3.Filter. Do you need noise suppression?

4.Air intake. Ducted or ductless?

5.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
8 000rpm
Temperature limit
°C

Options

Noise-suppression filter
Air intake
Fan
bidirectional
Isolated ground
(standard)
3D STEP file, sent by e-mailDatasheet (PDF), sent by e-mail
Request this number
All 24 part numbers
Part numberSystemOutputFilterAir intakeWarranty
121421-13012 V350 AnoDuctless2.5 years
121421-13212 V350 AyesDuctless2.5 years
121424-13412 V350 AnoDuct 2.75"2.5 years
121424-13612 V350 AyesDuct 2.75"2.5 years
121421-13112 V450 AnoDuctless2 years
121421-13312 V450 AyesDuctless2 years
121424-13512 V450 AnoDuct 2.75"2 years
121424-13712 V450 AyesDuct 2.75"2 years
221421-23024 V350 AnoDuctless2.5 years
221421-23224 V350 AyesDuctless2.5 years
221424-23424 V350 AnoDuct 2.75"2.5 years
221424-23624 V350 AyesDuct 2.75"2.5 years
221421-23124 V450 AnoDuctless2 years
221421-23324 V450 AyesDuctless2 years
221424-23524 V450 AnoDuct 2.75"2 years
221424-23724 V450 AyesDuct 2.75"2 years
521421-53048 V200 AnoDuctless2.5 years
521421-53248 V200 AyesDuctless2.5 years
521424-53448 V200 AnoDuct 2.75"2.5 years
521424-53648 V200 AyesDuct 2.75"2.5 years
521421-53148 V250 AnoDuctless2 years
521421-53348 V250 AyesDuctless2 years
521424-53548 V250 AnoDuct 2.75"2 years
521424-53748 V250 AyesDuct 2.75"2 years

Cross-reference

Which alternator does it replace?

Type the number on your current alternator. If it is on our list, the 20 AT fits in its place and we show you the matching voltage.

    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 12 V 210 A · 24 V 200 A · 48 V 125 A at 2 000 alternator rpm.
    High-temperature bearingsRated for the engine bay: 110 °C on 12 V; 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 2.75".
    48 V for lithium banksThe 48 V versions charge LiFePO4 banks directly, 200 or 250 A.

    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