SMA inverters & generators [RE-wrenches]

[Kirk Herander]

I have two larger PV systems with backup generators. Generators are 30kw and
500kw respectively, holding up all loads (no critical load breakout). I was
told by SMA not to allow the inverters to see generator power in the event
of a grid power failure (but I am curious to understand synch if its
practical without frying the inverters)so here's what I did:

1) 10kw pv w/ 30 kw backup generator - tapped inverter output to utility
side of the generator ATS, knowing that ATS contactor was break-before-make
when switching house loads to generator power.
2) 40kw pv w/ 500 kw backup generator - could not do 1) because switchgear
and inverters are located in different buildings / conduit logistics. But
this generator ATS has many SPDT relays which change state when generator
turns on - so we used one to drive the coil of a 480 / 277 three phase
contactor. This disconnects all inverters from the grid whenever the genny
starts, which is weekly for exercise at minimum.    

Kirk Herander
Vermont Solar Engineering
802.863.1202
fax 802.863-7908
NABCEP(tm) Certified Solar PV Installer
Xantrex Certified Dealer Charter Member
NYSERDA-eligible installer
VT Solar Incentive Program Partner

-----Original Message-----
From: Carl Adams [mailto:swingjunkie at gmail.com] 
Sent: Tuesday, June 03, 2008 1:35 PM
To: RE-wrenches at topica.com
Subject: Re: SMA inverters & generators [RE-wrenches]

On a similar subject I will be installing a large grid tied array (15
kW) for an upcoming project.  The owner is also equipping the site
with a 45 kW backup generator.  In the event of the grid going down
will the SMA inverters be capable of synchronizing with the generator
(perhaps after adjusting the Hz, V, and time limits) as Jay suggests.

Blair please post what you find out from SMA.

Cheers
Carl


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