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-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@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 jdeboe...@trojanbattery.com www.trojanbattery.com -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@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:will...@millersolar.com> will...@millersolar.com <http://millersolar.com> http://millersolar.com License No. C-10-773985 _______________________________________________ List sponsored by Home Power magazine List Address: <mailto:RE-wrenches@lists.re-wrenches.org> RE-wrenches@lists.re-wrenches.org Options & settings: <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: <http://www.re-wrenches.org/etiquette.htm> www.re-wrenches.org/etiquette.htm Check out participant bios: <http://www.members.re-wrenches.org> www.members.re-wrenches.org This e-mail message and any attachments that accompany it may contain information that is confidential, privileged, or protected from disclosure. It is intended solely for the use of the individual(s) to whom it was intended to be addressed. If you have received this e-mail by mistake, or you are not the intended recipient, any reading, disclosure, copying or other use of this communication is strictly prohibited. If you have received this communication in error, please immediately advise the sender at their phone number listed above, or by electronic mail, and also permanently delete the original and all copies of this e-mail and any attachments from all locations. Thank you.
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