# Curtis Controller Model Conventions are Bizarre

**URL:** <https://community.electricforum.com/t/curtis-controller-model-conventions-are-bizarre/1732>\
**Category:** EV Small Talk\
**Created:** [September 14, 2011, 10:45pm UTC](https://community.electricforum.com/t/curtis-controller-model-conventions-are-bizarre/1732 "2011-09-14T22:45:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Gregski](https://avatars.discourse-cdn.com/v4/letter/g/ecc23a/32.png) [@Gregski](https://community.electricforum.com/u/Gregski)\
**Post date:** [September 14, 2011, 10:45pm UTC](https://community.electricforum.com/t/curtis-controller-model-conventions-are-bizarre/1732/1 "2011-09-14T22:45:02Z")

</div>

check out this insanity

Model 1221B can be any of these

```
24-36 V, 600 A
36-48 V, 550 A
48-72 V, 500 A

```

see the rest of the madness here

[Curtis Instruments | Series Motor Controllers](http://curtisinstruments.com/index.cfm?fuseaction=cProducts.dspProductCategory&catID=11)