Is this the case with gel batteries as well? Jonathan Hill, senior system engineer and founder Sierra Solar Systems
On Aug 3, 2012, at 2:01 PM, Vince McClellan wrote: > On 8/2/2012 1:06 PM, Drake wrote: >> >> Hello Wrenches, >> >> Thanks for your help with this question. >> >> I've had a breakthrough on the design of this system. I talked with Tom at >> Midnight Solar, and he explained that Concord batteries can be charged at C >> X 5 if necessary, i.e., 5 X AH capacity of the bank. The batteries like a >> fast charge. They are a bit spendy, but will simplify the overall system >> design. >> >> From the Manual: >> "The charging current during the Bulk stage should be set as high as >> practical; higher current mean faster recharge time. For repetitive deep >> cycling, chargers should have an output current of at least 0.2C (20 Amps >> for a 100 Ah battery). If the output current is less than this value, the >> cycle life of the battery may be negatively affected. Due to low impedance >> design, Sun Xtender batteries can tolerate in-rush current levels as high as >> 5C (500 A for a 100 Ah battery). " >> >> It is imperative to keep the system voltage at the required set point. The >> CC regulation will prevent the batteries from being harmed, as the >> voltage will rise quickly. >> >> Drake >> >> Drake Chamberlin >> Athens Electric LLC >> OH License 44810 >> CO License 3773 >> NABCEP Certified Solar PV Installer >> 740-448-7328 >> http://athens-electric.com/ >> >> >> >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: [email protected] >> >> Options & settings: >> 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 >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> > Just a word of caution on the AGM batteries. AGM's do have some > vulnerabilities compared to deep cycle wet filled batteries. We had a bank of > 20, 8A8D running a Buddhist Retreat compound and were unable to convince our > clients that there were limitations to the amount of power that they could > run at one time. They managed to overheat and destroy the whole bank of > batteries we think by using too much power during a retreat camp. People had > brought there own appliances to use at the camp and we still don't know what > the total load was on the 4, Outback VFX 3648 inverters. I'm guessing it was > up there close to the 14.4 kW limit of the Outback inverters. We also > petitioned our client for a larger battery bank but they didn't think they > would ever need that much power. > > -- > > -- > Vince McClellan > Energy Design > www.solarenergydesign.com > p: 541.485.8122; f: 541.338.3168 > > This email and any files transmitted with it are confidential and intended > solely for the use of the individual or entity to whom they are addressed. If > you have received this email in error please notify the sender. If you are > not the intended recipient you are notified that disclosing, copying, or > distributing the contents of this email is strictly prohibited. > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > 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 > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
_______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: 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 List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
