[UK-CONTEST] Portable Generators....

Robert Chipperfield robert at syxis.co.uk
Wed Apr 4 16:48:40 PDT 2012


Hi Stuart,

Whilst that's true of "normal" generators, it's much less bad for the 
inverter models. A 2.6kVA inverter will happily supply 1.5kW AC input to 
a linear even in CW, and voltage at the generator output remains 
constant, so the only dip is due to drop over the distribution cabling.

You're absolutely right about mains cable sizing, though - at least 
2.5mm^2, and ideally 4mm^2 for any long (>30m) runs. That said, if the 
linear uses a switch-mode PSU (e.g. the Quadra), dips in the mains 
voltage don't typically get reflected in the DC output as long as it 
remains within spec (which is pretty broad). Most "13A" extension reels 
only use 1.5mm^2, which over a 50m run can lead to a ~15V drop at 1.5kW.

Cheers,
Rob, M0VFC

On 05/04/2012 00:08, M0RXX wrote:
> Hi
> I like the over kill method for a generator especially if cw is used. Allow 4 times your stated load current (4 KW min) with heavy cables i.e. 32 amp to as close to the equipment then a 13 amp multi socket straight to a 32 amp plug. Yes I know it is over kill but it will stop voltage dips that cause splatter if too big a dip occurs. If you use any lighting then low energy lamps (yes watch the RFI test first) and if ok watch for dips when you Key Down! If you hire for a weekend remember to get a service contact available 24/7 generators do fail. Try a 3 Kw setup but don't be surprised is there is a big dip.
> Anything smaller is not worth the risk!
> Use a long lead from the genny set to the Dist board to cut down voltage drop which will be more than you expect.
> Let me know how you get on please it is a subject I am interested in thanks.
> Good luck.
>
> Ex Hospital Electrical Engineer.
>
> Stuart Southern.
>
> Radio Amateur. M0RXX
> First Aid Saves Lives.
>
> Think - If a Cardiac Arrest happened where you are now - where would the nearest AED be?
>
> AEDs save lives..."The Resuscitation Council (UK) strongly recommends the implementation of early defibrillation. Increased provision of early defibrillation through the widespread deployment of AEDs is now considered a realistic strategy for reducing mortality from cardiac arrest due to ischaemic heart disease."
>
> Sent from my iPad
>
> On 4 Apr 2012, at 17:54, robert rushbrooke<rrushbrooke at yahoo.com>  wrote:
>
>> Slightly off topic but I would be interested to hear what portable contest stations are using in the way of generators and what equipment it powers.
>>
>> My club runs a single radio, Acom 1000 and a couple of laptops.
>>
>>
>> Regards,
>>
>> Bob - 2E0KLO
>>
>> rrushbrooke at yahoo.com
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