Gerhard,
A "unit" refers to  the unit of power measurement - 1 unit = 1kw/hr.

This may be an NZ / UK usage. I/m not sure where it came from but it 
is commonly used here.

Richard P

On 04/11/05, Gerhard Fiedler <lists@connectionbrazil.com> wrote:
> Russell McMahon wrote:
>
> > I purchased a 700 watt nominal petro genset recently for $NZ99
> > Say unit would run for 1000 hours with no maintenance.
> > $99/$1000 = $0.10/hour.
> > Assume 750 watt electrical and 80% efficient overall and 10 kWh/litre
> > for petrol and $1.40/l and 15% of output is electrical.
> > Output = 0.75/.15 = 5 kW (750 W elec, 4250 W heat).
> > Energy in is 5 kW/0.8 = 5.25 kW.
> > Fuel/hr = 5.25/10 = 0.525 l
> > Fuel cost/hr = .525 x $1.40 =~ $0.75
>
> So far I follow you...
>
> > If we throw unit away at 1000 hrs cost per hour is $0.85/hr =
> > $0.17/unit
> >
> > That's about the cost of electricity per unit now
>
> Russell, what is "unit" in this context? I thought it meant a unit of the
> generator, but then the numbers don't make sense to me. What does a cost
> per unit ($0.17/unit) mean?
>
> Calculating the cost of electricity according to your numbers, I get:
> TCO (based on 1000 h): 850 NZD
> Electric energy produced: 750 kWh
> TCO per electric energy produced: 850 NZD/750 kWh = 1.13 NZD/kWh
>
> Gerhard
>
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