TheGriz
More Power Scottie!!!
- Joined
- Feb 17, 2020
- Messages
- 128
Hello all,
50% State-of-Charge is the recommendation for storing LFP cells from all I've read. I have a few questions to help me understand that recommendation better:
1. In looking at the charge profile on the spec sheet, it appears the 50% SOC mark is about 3.28V per cell, or 13.12V for the battery pack. Is this voltage about right for the 50% SOC benchmark (assuming roughly 15mv delta on cells)?
2. What is the timeframe for the battery to be considered 'in storage'? Is it a week, a month, 3 months, or whatever? The reason I ask is I use my LFP pack on an occasional basis, not like someone using for on-grid or off-grid purposes cycling the batteries regularly. I use for an occasional RV trip, an occasional Ham radio event, and the 'who-knows-when' power outage at my home.
3. Is there a tolerance to that 50% SOC for storage? Is it 40-60% SOC, or 30-70% SOC, or whatever?
4. And lastly from what I read, use only 80% of stored power. I read that as don't fully charge to 3.65 V, and do not fully discharge to 2.5V. Again looking at the specs and the Charge Curve, I read that to keep the SOC about 90% of fully charged at 3.65V, and 10% above fully discharged at 2.5V...or about 3.3V to 3.1V range. What are your thoughts?
Any insights appreciated.
Thank you,
Mike
50% State-of-Charge is the recommendation for storing LFP cells from all I've read. I have a few questions to help me understand that recommendation better:
1. In looking at the charge profile on the spec sheet, it appears the 50% SOC mark is about 3.28V per cell, or 13.12V for the battery pack. Is this voltage about right for the 50% SOC benchmark (assuming roughly 15mv delta on cells)?
2. What is the timeframe for the battery to be considered 'in storage'? Is it a week, a month, 3 months, or whatever? The reason I ask is I use my LFP pack on an occasional basis, not like someone using for on-grid or off-grid purposes cycling the batteries regularly. I use for an occasional RV trip, an occasional Ham radio event, and the 'who-knows-when' power outage at my home.
3. Is there a tolerance to that 50% SOC for storage? Is it 40-60% SOC, or 30-70% SOC, or whatever?
4. And lastly from what I read, use only 80% of stored power. I read that as don't fully charge to 3.65 V, and do not fully discharge to 2.5V. Again looking at the specs and the Charge Curve, I read that to keep the SOC about 90% of fully charged at 3.65V, and 10% above fully discharged at 2.5V...or about 3.3V to 3.1V range. What are your thoughts?
Any insights appreciated.
Thank you,
Mike
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