Mike, I have some questions for you about those packs. I know I would have to buy two and wire them in series to produce 24V like I do with my SLAs. I understand that part, but the PCB won't fit those terminals. Do you or can you open up the battery and install the PCB on the individual cells in the pack? Does the PCB act like a BMS circuit?
Derek On Fri, Sep 20, 2013 at 11:17 AM, Mike Mangus <[email protected]> wrote: > A realtively good cost for the 20Ah LiFE cells can be found at > http://www.batteryspace.com/LiFePO4-Prismatic-Box-Battery-12.8V-20Ah-256Wh-10C-rate-without-PCM.aspx. > The plastic case contains four 20Ah cells and does not come with a battery > management system. Many guys in the model warship world are using these > cells with a simple balancer found at > http://www.batteryspace.com/Smart-LED-Balance-Module-for-3.2V-LFP-Cell-with-250mA-Balance-Current.aspx. > One balancer across each cell helps keep the cells balanced to each other > without limiting the output current. The cells themselves are good for a > continuous 200 amp draw. > > I switched my combat ships to these cells (and the Headway cylindrical > 10ah cells for smaller ships) a couple years ago and have never looked > back. Half the weight and more capacity than a similir sized SLA, longer > cycle life, and they don't dump voltage under load. My ships can battle > all day on one charge ... heck, I don't even take a charger out to the pond > anymore. > > Wish I could make it up for the upcoming battle. T81 is still awaiting > its time on the building schedule to get remotered. SV15 is even further > down on the schedule requiring a total rebuild from the suspension up. > Lastly the semi-secrete tank project is stalled as other higher priority > projects compete for time. Still, the goal is to have all three assets > operational by the 2014 Spring Battle. :) > > Mike M > > *From:* Derek Engelhaupt <[email protected]> > *To:* [email protected] > *Sent:* Friday, September 20, 2013 9:12 AM > *Subject:* Re: [TANKS] Re: Battery find > > Under normal conditions the motors don't pull 30 amps, but I have blown > a 30 amp fuse on the Sturmtiger using the same motors. 18AH batteries are > sufficient using SLAs for most tanks. I'm just really not sure about what > size LIFEPO4 battery pack I should use. I was demonstrating the KV-2 to > some people that visited us and the two 7AH batteries got really hot. One > was so hot that it started to bulge so I really need to find a sufficient > battery pack for this beast. I was thinking that the 20AH packs would be > sufficient to power it. Problem with going over 20AH is price. > > Derek > > > On Fri, Sep 20, 2013 at 7:30 AM, isaac goldman <[email protected]>wrote: > > Max discharging current : 30 Amps. > > If you happen to pull more than 30 amps total the battery will shut down > on you. Your going to want to make sure running both drive motors doesnt > pull more than that... > > > On Fri, Sep 20, 2013 at 7:56 AM, TyngTech <[email protected]> wrote: > > I would say that on this unit, the BMS is integral to the case. I don't > see any connectors or wiring that would indicate an external BMS unlike > this sellers 15AH solution. > > > http://www.ebay.com/itm/24V-15AH-LiFePo4-battery-Lithium-Electric-Bicycle-Scooter-Rechargeable-Battery-/221280643607?pt=US_Rechargeable_Batteries&hash=item33855aaa17 > > Steve > > > On Friday, September 20, 2013 4:52:59 AM UTC-4, Neil Rochford wrote: > > Cant grumble at the price, I`ve been looking at something like this for my > e-bike that I can also use in my tank. Im just a little concerned about > reliability of a technology I dont understand, Does the BMS come part of > the battery box ( integrity built in ) or does it require finding a home in > the tank somewhere ?. > Think how much weight would 2 X 12v SLA 20AH be ? compare that to 4.8kg > wonderful stuff imo.but remember I know nothing 8) > > Neil > > > > On Thursday, September 19, 2013 8:59:16 PM UTC-7, [email protected] wrote: > > What do you guys think of this one? Kind of a nice setup with a > voltmeter, on/off switch, quick disconnects, charging port, and a charger. > All in a nice neat package. I'm looking at it for the KV-2 so it will fit > in that tank. It's about 7"x3"x10" from my quick calculations. > > > http://www.ebay.com/itm/321207262810?ssPageName=STRK:MEWAX:VRI&_trksid=p3984.m1423.l2661 > > Derek > > -- > -- > You are currently subscribed to the "R/C Tank Combat" group. > To post a message, send email to [email protected] > To unsubscribe, send email to > mailto:rctankcombat%[email protected]<rctankcombat%[email protected]> > > Visit the group at http://groups.google.com/group/rctankcombat > > --- > You received this message because you are subscribed to the Google Groups > "R/C Tank Combat" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to > mailto:rctankcombat%[email protected]<rctankcombat%[email protected]> > . > > For more options, visit https://groups.google.com/groups/opt_out. > > > > > -- > Isaac Goldman > 5142334423 > > This message contains confidential information and is intended only for > the individual named. If you are not the named addressee you should not > disseminate, distribute or copy this e-mail. > -- > -- > You are currently subscribed to the "R/C Tank Combat" group. > To post a message, send email to [email protected] > To unsubscribe, send email to > mailto:rctankcombat%[email protected]<rctankcombat%[email protected]> > > Visit the group at http://groups.google.com/group/rctankcombat > > --- > You received this message because you are subscribed to the Google Groups > "R/C Tank Combat" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to > mailto:rctankcombat%[email protected]<rctankcombat%[email protected]> > . > > For more options, visit https://groups.google.com/groups/opt_out. > > > -- > -- > You are currently subscribed to the "R/C Tank Combat" group. > To post a message, send email to [email protected] > To unsubscribe, send email to [email protected] > Visit the group at http://groups.google.com/group/rctankcombat > > --- > You received this message because you are subscribed to the Google Groups > "R/C Tank Combat" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- > -- > You are currently subscribed to the "R/C Tank Combat" group. > To post a message, send email to [email protected] > To unsubscribe, send email to [email protected] > Visit the group at http://groups.google.com/group/rctankcombat > > --- > You received this message because you are subscribed to the Google Groups > "R/C Tank Combat" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- -- You are currently subscribed to the "R/C Tank Combat" group. 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