[UK-CONTEST] Portable Generators

[Dale Harvey]

Hi Stuart, OK, this is where I got to. Is an "On line" UPS the one I should be looking for. The bad news is that 10kVA UPS's are not light units and the issue, just like with large generators, is one of carriage. You don't get anything for nothing in life!
Dale G3XBY

-----Original Message-----
From: M0RXX [mailto:stuart at m0rxx.me.uk] 
Sent: 05 April 2012 11:57
To: dale.harvey at eddystone-broadcast.com
Cc: <uk-contest at contesting.com>
Subject: Re: [UK-CONTEST] Portable Generators

If you draw more current than you put in the batteries may take the load. It depends If the batteries are floated then the batteries will take the load straight away and the genny will charge the cells, but if there is power on the sensing circuit it may try to run off the genny rather than the cells, check the sensing / charging / load circuit. Good luck but it should work, let us know the result. 

Stuart Southern. 

Radio Amateur. M0RXX
First Aid Saves Lives.

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Sent from my iPad

On 5 Apr 2012, at 11:20, "Dale Harvey" <dale.harvey at eddystone-broadcast.com> wrote:

> I have found exactly what you are all reporting with "conventional"
> generators regarding the lag associated with high peak powers. The 
> inverter generators certainly sound like the real deal.
> 
> This set me thinking... you can buy second hand UPS's on Ebay for a 
> reasonable price. These are usually used to provide no-break back up 
> for computer servers and the like. A typical large unit may be rated 
> at 10kVA (or 8kW) and will hold up this load in the absence of mains 
> for a period of time which depends on the batteries fitted (and their 
> state in the case of second hand units)
> 
> If a UPS were to be fed from a conventional generator (an ex-burger 
> van 2.5kW genny costing £70.00 in my case), is it true that I could 
> draw a peak load of up to 8kW, providing the average did not exceed 2.5kW?
> 
> This would also have the advantage that the genny could be stopped for 
> re-fuelling without having to close down the station.
> 
> Dale G3XBY
> 
> 
> 
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