50/50 vs 100-0-100 generator loading

[mbrooke]

Ok, say you've got a site that needs 1000kw of power. Would it be better to purchase two 1000kw gensets running each at 500kw (1000kw for the failure or service of the other) or purchase 3 500kw gensets using one as a spare for service or failure of the other two?

Or simpler way to view it: two 1000kw gensets in parallel or three 500kw gensets in parallel. 1000kw load.


Two schemes- can't make up my mind which is better or why. Help.

 

[LarryFine]

That's lots of watts!

I'd start with cost of each way vs critical-ness.

 

[mbrooke]

That's lots of watts!

I'd start with cost of each way vs critical-ness.

Not really. Alternators don't get big until around 650MW.

 

[petersonra]

Get three 500 KWs in my opinion. The gear is smaller and you still have 50% capacity left even if you lose two of your three gen sets.

 

[mbrooke]

Get three 500 KWs in my opinion. The gear is smaller and you still have 50% capacity left even if you lose two of your three gen sets.

Alright.

But I've still got 50% capacity with the two gen option.

 

[petersonra]

Alright.

But I've still got 50% capacity with the two gen option.

Not if you lose both

 

[mbrooke]

Not if you lose both

True, there is that part.