[RE-wrenches] Best Battery

[Kirk Herander]

The cost sounds accurate, considering Blues are 2.5 to 3x the cost of LG Resu's for instance. To minimize sticker-shock, remember they are rated for 8000 0-100%SOC cycles (that's 21 years daily). And certified immune from thermal runaway.

I assume we are talking 48v here, not their 850v cabinets. BI 48v cabinets can contain up to 16kwh ea, max configuration is 448kw as I remember, -9- full cabinets is 144kw. You are ok there. A 16 kwh cabinet is rated for 320AH at a nominal 50 vdc (-8- 2kwh mods @ 40 ahr ea.).

The key is the on-board smart battery management unit, BMU, made by a company called Ageto. it will manage charge and discharge evenly down to the 2kwh battery module level. Each module even has a solid-state "regulator" visible from the front.

No worries about different cable lengths, inverter/load feed position on the battery bus, etc, as in flooded cell design.

I've found when paralleling cabinets together, you will be on your own to properly size and protect a DC combiner bus/cabinet.

On 8/11/2020 9:04:41 AM, William Miller <william at millersolar.com> wrote:
Friends:
 
I am hoping y’all can tell me I am doing something wrong with my arithmetic.  I have registered to purchase Blue Planet batteries and priced the product.  I come up with math that indicates that comparing usable amp/hours to usable amp/hours, that the Blue Planet is 5 times the cost of a flooded L-16 battery array on a cost per kilowatt/hour.  Can this be true?
 
I am using these parameters:
 
1.   DOD for flooded L16s: 50%
2.   DOD for Blue Planet: 100%
 
I hope I am wrong.
 
Also, we often install battery arrays that are upwards of 4,000 AH.  For example, we installed 5,668 of East Penn flooded batteries on a couple of projects.  To acquire the same capacity in Blue Planet would require 9 cabinets (again 50% DOD versus 100% DOD).  Is this correct design?  Is it practical to install 9 cabinets?  Does the system detect and compensate for circulating currents in this many parallel strings?
 
Thanks in advance.
 
William Miller
 
 
From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org]] On Behalf Of Jerry Shafer
Sent: Sunday, August 9, 2020 12:02 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Best Battery
 
Wrenchel have been very happy with all my Blue Planet battery systems, best battery you will install.
Jerry
 
On Sun, Aug 9, 2020, 11:19 AM <drake.chamberlin at redwoodalliance.org [mailto:drake.chamberlin at redwoodalliance.org]> wrote:
Hello Wrenches,

What is the best Li-Ion battery to use with an off grid system?

Thanks,

Drake
Athens Electric

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