[RE-wrenches] Battery Charger

[Orion Thornton]

Brian,

 

I believe the Generac is about 5 years old, definitely a later model.   We
could not visually identify any adjustments that could be made to the rpm
rate.  Although I should look closer into this to make sure as it would be
the easy fix, especially if the rpm's are electronically controlled.  

 

There was no load on the generator as the Outbacks would not grab on.  The
batteries were full and there was no additional loads being applied to the
generator. 

 

Thanks, I will look closer into the rpm rate.

 

Orion Thornton

Project Manager

Independent Power Systems

NABCEP Certified PV Installer

(W) 406.587.5295

(C)  406.249.9912

www.solarips.com <http://www.solarips.com/> 

 

 

 

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Brian
Teitelbaum
Sent: Monday, September 28, 2009 1:48 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Battery Charger

 

Orion,

 

If the Generac generator is running at 58Hz, it means that the engine speed
is about 120rpm too low (on a 3600rpm genny; half that for a 1800rpm unit).
There should be some sort of adjustment to the engine governor on the unit,
but I'm not familiar enough with the newer Generacs to know where it is, or
even if there is an adjustment. If it's electronically governed, rather than
mechanically, you may need to replace the electronic unit.

 

Or, you may just be overloading the generator. You might try turning down
the charge rate on the OutBacks.

 

All this is still not a  guarantee that the OutBacks will sync up.

 

 

Brian Teitelbaum

AEE Solar

 

 

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Orion
Thornton
Sent: Monday, September 28, 2009 11:43 AM
To: 'RE-wrenches'
Subject: [RE-wrenches] Battery Charger

 

Wrenches,  

 

We recently installed a grid-tie battery backup system using two Outback
GVFX 3648 inverters.  The client has an existing Generac backup generator, 8
kW @ 240VAC.  From the beginning we told the client that the power quality
from the Generac may not be within tolerance to integrate with the grid-tie
inverters and charge batteries.  This assumption was confirmed today when we
commissioned and tested the system.  The output frequency of the Generac was
58 hz.

 

To get to the point does anyone have a battery charger they recommend for
this application?-8 kW @ 240VAC generator output to 48VDC battery bank.  Or
maybe another suggestion to be able to integrate the generator into the
system, we are also planning on manually transferring the generator output
to power the critical loads if an inverter goes down.

 

It also seems that the dc genset controls through the mate would be the best
way to control the battery charger-any thoughts?

 

Thanks in advance for any input.

 

Orion Thornton

Project Manager

Independent Power Systems

NABCEP Certified PV Installer

(W) 406.587.5295

(C)  406.249.9912

www.solarips.com <http://www.solarips.com/> 

 

 

 

 

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