[GreenKeys] Variable Frequency Drives for synchronous motors 50/60Hz

[John Spigel]

I've have a 500W "Pure Sinewave" inverter and am able to run a model 15 
for several hours off a 100Ah 12v deep cycle battery.  Several sold on 
Amazon have additional USB 5V connectors for accessories. The smaller 
inverters have spring jaw clips to attach to your battery. Funny how 
nowhere do they say whether they are 50 or 60Hz. Might ask seller 
whether they can be switched. Price was about 50USD.
73, John W1AN

On 16-Nov-25 10:53, Windows XD wrote:
> In fact, now that I think about it you could probably cut out the 
> middleman and do something like plugging in a European 12VDC car charger 
> and then hooking a US inverter up to it so you wouldn't be reliant on 
> the battery.
> 
> On Sun, Nov 16, 2025 at 10:48 AM Windows XD <antech6586856 at gmail.com 
> <mailto:antech6586856 at gmail.com>> wrote:
> 
>     I've heard of using US 60 hertz battery powerbanks for using 60hz
>     stuff but I don't know how long that would power a teletype.
>     Something like this <https://www.amazon.com/dp/B082TMBYR6/
>     ref=sspa_dk_offsite_brave_1?
>     aaxitk=813c48a373c02a87e7fda2054e43b758&tqtoken=AgR48QhKJSyZ88_kP9xWcVxj4qb28Y6KZWM8ipgr57rhTg0AGgABAAlyZWNpcGllbnQAC0FtYXpvbkFkc1RRAAEAEWF3cy1rbXMtaGllcmFyY2h5ACRiM2NlMjE3OS0wMzJhLTQ5NTAtOWFlZC00MTczZDMxZmNhMmEAXNl6RXMZCptZ6YmQri2HvwQpDuoWrd6_BX6KtSXtK8nXMwFE6ZdgvB9GW5UIy9JYq-K_8MIgX7x8AyNba-COmKMRGIpIifo2Pg3JQIiu0v-_I-9lU4AZa4S5YVU1AgAAEAD7mwwe168kJaRGEY5hm0W0Ko6_w6S0-Zx4pMArUcafOVh_FWuP1wzbvjcdgnKlFGz_____AAAAAQAAAAAAAAAAAAAAAQAAABvlvPRzPiLdbE3XGyuT_tcEtclAQeQ4TizDGmyJu38pYKKXBAb1GWxgsdzs&offsiteFlag=1>, charge it with DC then use it for AC.
> 
>     On Sun, Nov 16, 2025 at 1:57 AM Peter Leonard <peter at lencom.com.au
>     <mailto:peter at lencom.com.au>> wrote:
> 
>         Hi All,
> 
>         We in the 50Hz 240V world have a problem with machines fitted
>         with 60Hz synchronous motors. Machines originally used here are
>         fitted with governed 110V motors but I have acquired two with
>         60Hz sync motors. The 240/110V problem is easily fixed with a
>         transformer. But.
>         Has anyone experience with using Variable Speed Drive Units,
>         240V drives are readily available but would have to power the
>         motor via a transformer.
>         Any suggestions.
> 
>         Thanks.
> 
>         Kind regards,
> 
>         73 Pete VK5XP
> 
> 
> 
> 
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