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Old 10-08-2015, 03:06 PM   #1
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Lithium Battery Advice

Hi, Im going to park up my Windjammer 3008w empty for six months in the height of summer, while Im overseas.
It has 600Ahr of Lithium Batteries and 1200w of solar on the roof.
What is the best way to protect the batteries? Is it ok for them to remain fully charged? Or do I set a daily timer to use some battery power?
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Old 10-09-2015, 08:40 AM   #2
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What model battery are you using?
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Old 10-09-2015, 01:22 PM   #3
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What model battery are you using?
Lithium Ion Phosphate,
Sinoploy 4 Cell 13.2v,
3x200 A/hr.
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Old 10-09-2015, 04:20 PM   #4
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Those are pretty cool batteries!

While I have no experience with them but I found this.

BU-702: How to Store Batteries €“ Battery University

They say that they need to be stored at 40% capacity for long life and not 100% like lead acid.

"While lead acid must always be kept at full-charge during storage, nickel- and lithium-based chemistries should be stored at around a 40 percent state-of-charge (SoC). This minimizes age-related capacity loss while keeping the battery operational and allowing for some self-discharge."

and this

"Finding the exact 40 percent SoC level to store Li-ion is less important that removing some charge and voltage serves as a handy fuel gauge indicator. At 40 percent charge, most Li-ion has an OCV of 3.82V/cell at room temperature.

To get the correct reading after a charge or discharge, rest the battery for 90 minutes before measurement. If this is not practical, overshoot the voltage on discharge or charge by 50mV. Discharge to 3.77V/cell or charge to 3.87V/cell, and the rubber band effect will settle the voltage at roughly 3.82V. Figure 1 shows the typical discharge voltage of a Li-ion battery."

How you do that is beyond me...
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Old 10-09-2015, 08:26 PM   #5
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Lithium Ion Phosphate,
Sinoploy 4 Cell 13.2v,
3x200 A/hr.
Im wondering if I can just set a timer and run something a few hours a day. They are said to easily handle 3000 cycles of 50% discharge without loss of capacity. So maybe rather than a 40% state of storage keep them in a state of constant daily usage?
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Old 10-09-2015, 08:40 PM   #6
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Very cool batteries. We started using them in some formula race cars with a 75% reduction in weight. Also the immediate cranking power is awesome. There are Lithium Ion Phosphate battery chargers that you can get from wherever you got the batteries. Typically they have a normal charge mode and also a "storage mode". They are smart enough to keep the batteries at the proper storage level. Whoever sold you the batteries should have advised you of this...


Here is the one we use. http://shoraipower.com/chargers-c43
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Old 10-09-2015, 09:31 PM   #7
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It never fails to amaze me at the quality and breadth of knowledge of our members. Kudos to all who aid those in need.
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Old 12-09-2015, 11:21 AM   #8
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Do you have any pics and info on your battery pack?


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Old 12-09-2015, 11:54 AM   #9
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If you are storing the unit for six months. I would discharge the battery to 40% and disconnect it. I will remove it and store it in a cool dry place. The worst thing you can do to lithium batteries is to leave them sit at full charge. Doing that will dramatically reduce the life expectancy of the batteries. Also although LiFe batteries are much safer than LiPo I would still not charge unattended for an extended period of time.
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Old 12-09-2015, 12:37 PM   #10
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Do you have any pics and info on your battery pack?


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Dont have a photo of my setup, but here is a photo of a 400Ahr battery on the bench, before they worked out they couldnt fit the larger ones. That is an A4 (letter) piece of paper. Mine are 3x200Ahr.
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