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 <will...@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-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@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.chamber...@redwoodalliance.org
[mailto:drake.chamber...@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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