[RE-wrenches] Huge battery bank recommendation

[Kevin Pegg]

Hi Mac, 
 
We fabricated and operate a similar sized (400 kWh) battery / inverter / generator hybrid system for BC Hydro, our power utility servicing a remote community. It has been online for 2 years now. 
 
Using Dekka / East Penn D-series batteries which we had custom built to our specs. 
 
A notable difference is we have 100 kW diesels and 60 kW inverter capacity in a 120/208 SMA inverter config (stepped up to 14.4 kV distribution). The system works really well and it currently 100% uptime for last 12 months. This is an unattended system we are onsite to maintain every 2 months. No renewable input at this time. 
 
The sizing you have reported seems out of ratio. ~ 20 kW of charging power into a 400 kWh battery bank ie C/5. Depending on the loads the gen is carrying along with charging that could further reduce available charge capacity. That generator is going to have to run for a very long time to charge that battery. We call this the big battery blunder syndrome - which has caused many failures of such scale of system. 
 
Kevin

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org]On Behalf Of Mac Lewis
Sent: March 11, 2014 7:27 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Huge battery bank recommendation


To clarify, this is for an off-grid application, 4 Sunny Islands, 30kW generator.


On Tue, Mar 11, 2014 at 9:16 AM, August Goers < august at luminalt.com> wrote:


Mac, 

Is this for an off grid system? We're doing our first project with a Deka Unigy II battery system but they are AGM and I believe only good for grid tied battery backup or applications where you won't have a very deep depth of discharge:

http://www.dekabatteries.com/assets/base/0919c.pdf


Best,

August


August Goers

Principal

Luminalt Energy Corporation

o: 415.641.4000

m: 415.559.1525

www.luminalt.com

 



On Tue, Mar 11, 2014 at 6:24 AM, Mac Lewis < maclewis1 at gmail.com> wrote:


Hi wrenches, 

I am consulting on a job that requires an 8000 Ahr battery bank.  This is quite a bit beyond my normal battery bank realm.  What would you recommend for this?

Thanks in advance


-- 





Mac Lewis



"Yo solo sé que no sé nada." -Sócrates


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Mac Lewis



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