According to my Nissan data sheet I received when Nissan ship the modules to me, A maximum cell voltage of 4.2 volts require a charger voltage set to 4.5 volts. It was recommended to set the charge voltage to 4.16 volts for a cell voltage of 4.00 volts. This will give a very long battery life for my type of driving of 2 to 4 miles a day.
It was also recommended to not discharge the cells below 3.65 volts which is one half of the ampere hour capacity and watt hour energy. According to my Orion MSN Manual, the electrolyte starts to degrade above 4.0 volts. It also best to install more cells in parallel to reduce the discharge and charge rate per cell. I connect six 33.3 ah cells in parallel and than series the cell groups for 200 ah. Charging with a Manzanito Micro 50 amp charger set for Li Poly cells which is on a 60 amp service circuit breaker, it charges the battery pack at 48 amps or 48 A/6 cells = 8 amps maximum per cell. The discharge rate is also low. My Café Electric motor controller provides a constant 200 motor ampere while the battery pack provides a 3 to 1 factor or about 66.6 battery amperes. Each cell load is 66.6/6 = 11.1 amps. Driving two miles for 1.5 miles up hill and .5 mile down hill using battery power, because the hills are very rough, the charger only takes less than 10 seconds to get to the maximum set voltage, it takes about 30 minutes to charge at this lower rate of 11.1 ampere per cell or 48 battery amperes using about 5.0 ampere hour. Roland ----- Original Message ----- From: Lee Hart via EV<mailto:ev@lists.evdl.org> To: Electric Vehicle Discussion List<mailto:ev@lists.evdl.org> Sent: Saturday, February 06, 2016 11:50 AM Subject: Re: [EVDL] A couple of Leaf observations. With more added on. Lawrence Rhodes wrote: >> I noticed Lee Hart saying he doesn't charge to 100%. Why. Simple. I don't need the range. So there's no need to charge it to 100% or run it dead. And, there are reasons *not* to do it. My experience (with all types of batteries) has been that they last longer if they are not overcharged, and not deeply discharged. There is no sudden "cliff", where 99% is fine and 101% is destroyed. It's a gradual thing. The higher the state of charge, the shorter the life. Likewise on the discharge side. The deeper the discharge, the shorter the life. The exact relationship varies between batteries, and is unknown for new unproven designs. Thos True via EV wrote: > ...a Nissan engineer told me that the BMS on board the Leaf was > designed to limit both charging and discharging to protect the > integrity of the battery pack... I'm sure that Nissan has included a safety factor in what their instrumentation says is 100% and 0% state of charge. I also think Nissan believes what they are saying and doing is "right". But, I also believe that the auto companies have very little real-world experience with EVs and batteries. Nissan's customers already got burned by shortened battery life and range due in hot climates on the earlier Leafs. I know that their instrumentation is poor, and their idea of a "battery heater" is woefully inadequate for Minnesota weather. So, I will take the auto companies' advice with a grain of salt. After all, who will have to pay if their advice turns out to be wrong? Not them! -- Knowledge is better than belief. Belief is when someone else does your thinking. -- anonymous -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20160206/8920ba49/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
