Grid tie with Diesels? [RE-wrenches]

[Steve Johnson]

Geof,
I'm budgeting a system like this too, but with a 500 kw diesel genset 
(proposed by others).  This genset would be transfer switched to another 
system backed up with a 225 kw diesel which is in tandem with some 
inverters with batteries and some grid-tied and AC coupled with PV.  
Maybe 60 kw PV.
When the 225 diesel generator is on it would run close to full bore, say 
80% or so, charging batteries and running the grid.  When batteries get 
charged it shuts off.
The grid tied PV and battery/inverter systems would operate the system 
quietly as long as capable.  When batteries get to 50% the 225 diesel 
kicks in and supplies grid while charging batteries, then shuts off 
again.  This is just a preliminary design and no I haven't done a 
successful (or unsuccessful) project like this before.

The battery inverters would have to set the "tone" for the grid as they 
are the only thing always available.  But if they set the grid standard 
then how can the genset match it?  This is where I am stuck. But then it 
is late . . .


Steve Johnson
LightWave Solar Electric


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