[RE-wrenches] Trojan 2 volt L-16s

Mon Oct 8 13:41:51 PDT 2012

The Rolls L16 series 2 vdc are single cells. They come in three AH
capacities @ C20, the S-1590 being 1200 ahr. I will say I have not good luck
with the lowest capacity S-1380(1050 ahr). Won't hold a charge after only 1
yr in service at recommended charge rate.

Kirk Herander

VT Solar, LLC

dba Vermont Solar Engineering

NABCEPTM Certified installer Charter Member

NYSERDA-eligible Installer

VT RE Incentive Program Partner

802.863.1202

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of John
DeBoever
Sent: Monday, October 08, 2012 4:00 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Trojan 2 volt L-16s

William, Wrenches,

Thank you for asking.

Indeed the Trojan Premium L16RE-2V  is a monoblock flooded lead-acid
battery. The cells inside the monoblock are configured in parallel with
internal interconnects that are factory-welded and typically offer lower
resistance disparity compared to external interconnect cables and hardware
connections. This typically results in slower promotion of  uneven cells
typical in battery banks. Let's look at an example, when selecting an L16 2V
version vs. a L16 6V version of for the same battery bank Ah capacity:

For example, let's compare:

o   A battery bank of  1,110 Ah @ C20  @ 24V, configured as one string
consisting of 12x L16RE-2V 

= total of 12x L16RE-2V

= one string, thus total charging current  (Icharger) goes through all the
external interconnects cables of the string

=  Icharger = I1 = I2 = I3, same current, most likely will age the units on
a most similar way, with less impact on promoting uneven cells over time,
although still possible.

    With

o   A battery bank of 1,110 Ah @ C20 @ 24V, configured as 3 strings in
parallel, each strings consisting of 4x L16RE-B 

= total of 12x L16RE-B

= three strings in parallel, thus total charging current (Icharger= I1 + I2
+ I3) is divided into theoretically three same current in each string,
except there is a higher probability that each string resistance will differ
faster over time, thus promoting  faster uneven cells

For memo,  Trojan IND line are true 2V single cells, configured as 2V, or,
4V or 6V bundles in series in a dual-container. These 2V single cells will
be perfect to consider for larger Ah battery banks.

Sunniest regards,

John      

John F. DeBoever

Global Technical & Projects Director - Renewable Energy

Trojan Battery Company

12380 Clark Street 

Santa Fe Springs, CA 90670

Tel: +1-562-236-3000 Ext. 3139

Cell: +1-845-514-7600 - NY office time zone: USA EST (GMT-5)

Skype: john.f.deboever

Fax: +1-562-236-3239

jdeboever at trojanbattery.com

www.trojanbattery.com

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
Miller
Sent: Monday, October 08, 2012 2:59 PM
To: RE-wrenches
Subject: [RE-wrenches] Trojan 2 volt L-16s

Friends:

Has anyone used the Trojan 2 volt L-16 batteries?  They each have 3 cells, I
presume in parallel.

The question presents:  Although you can divide the strings by three, there
are still an equal number of batteries and cells to maintain and to get out
of whack.  Will these batteries be equally likely or less likely to have
cell imbalances in the future?

The only benefit I see is a reduction in string wiring jumpers.

Comments?

Thanks in advance.

William Miller

Miller Solar

Voice :805-438-5600

email:  <mailto:william at millersolar.com> william at millersolar.com

 <http://millersolar.com> http://millersolar.com

License No. C-10-773985

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