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Posted by Bernie Dwyer on 06/08/07 06:54
Smarty wrote:
>
> I raised the specific issue Bernie since most / all generators protect the
> individual circuits / phases with either fuses or circuit breakers, and you
> had estimated 29 and 30 amp loads in 2 of the 3 circuits which could, at
> most, be fused for 83/3 amps, roughly 27 amps. As my prior reply stated, you
> are operating with too small a margin, if any. I am, however, very
> surprised that only 20KW and 60KW options exist, since you would be very
> well served with a 25, 30, 35, or 40 KW set with much lower hourly operating
> cost, less noise, etc. I can only conclude that your local supplier does not
> offer intermediate sizes even though they are quite common and popular. If
> this is truly your predicament, then shifting some of the load to the least
> loaded circuit would be my solution rather than moving to a 60KW generator.
> As an alternative, could you rent 2 separate 15 or 20KW units, thereby
> gaining the benefit of redundancy if one of the two should fail? A single
> 60KW seems like the wrong way to go IMHO.
>
> Smarty
The local hire shop (who I'd prefer to do business with, as they
"donated" some extra equipment last time I did this), can source just
about any size genset, but if it's not one that they have on hand, I
have to pay extra to have it transported from whichever depot has it.
They did suggest supplying 2x 20KVa units, but that would mean having to
hire 2 sets of 70 metre 3-phase cable, and that pushes the price up
quite a bit.
I'll just do my sums on re-distributing the load vs. hiring a bigger
genset.
Thanks
--
Bernie Dwyer
There are no 'z' in my address
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