Re: [Emc-users] USB to PARALLEL cable.

[Slavko K. <es...@gm...>]

  Na 13.9.2010 12:39, Spiderdab je pisal:
> ..cut..
>> So you have aprox 310W power consumption. (1.4A @ 220V) and this is
>> aprox 26A @ 12V.
>> At your 100Ah battery this is little les than 4 hour operation time to
>> deflat battery 100% and reduce live of battery close to nill.
>> If you keep safe margin at aprox 50% deflating battery you have 2h
>> operation time.
>>
>> If you driver's are 24V then use two battery and power bomputer from
>> that. Near all computers have power around 18V so simple adapter is
>> needed. (and remove battery as just eat power. If you afraid of power
>> glitches the driver board is reseted 1'st and ruin part.)
>>
>> Still open question how you power router?
>>
>> Slavko.
>>
> yes, one.. my notebook works on 20Volts. are you saying to patch
> directly 24V to the notebook? or to find (build) a transformer from 24V
> to 20V?
Just need regulator. You can do it DIY is simple.
Just check what is labbeled on laptop adapter output. 20V ?A
You have to reduce from 24V to 20V. This is easy reach for linear 
regulators.
If you can measure real power consumption (DC side) best without battery 
as it can draw as twice as needed you can selec solution.
If it's under 2A (in most cases yes) you can live with LM78H18 and two 
diodes to do the job (and heatsink)


> and, the reason of not using the inverters is because them using more
> power than needed?
>
>
Yes. A lot more.