From all of my research on the LIFEPO4 batteries it is recommended to have a charge/discharge cycle that starts at 75%-80% SOC and go to 25%-20% SOC if you want the longest lifespan for your batteries. My question is how do I keep from prematurely charging or over discharging my batteries?
Charging your LIFEPO4 Battery Bank
- Thread starter nick4673
- Start date
svetz
Works in theory! Practice? That's something else
If I understand, there are devices call battery disconnects or low-voltage cutoff, and you'd want one that you could set so the SOC was greater than your desired 20-25%. Similarly, when charging the battery there should be charger parameters you can modify such that maximum voltage is the voltage at 75-80% SOC. Not all devices allow you to configure the settings, so when selecting hardware be sure to get ones that will do what you want.
Thank you for your reply. How will I be able to keep the charger offline until I actually want to charge the batteries? This will not be a solar system. I will be utilizing hydro power that is very constant in power production throughout the day and year. I guess I will be using the batteries more like a backup generator. I will call upon the batteries if I need more power, but will only charge the batteries when they reach the 25% SOC. I want to prevent a mid-cycle charge. I hope that clears up any confusion.
svetz
Works in theory! Practice? That's something else
You've got me on that one! I don't know a whole lot about the various hardware available, hopefully one of the other members will have an answer.
Hook up some form of Coulomb meter, or hall effect sensor, and find the charging voltage required to hit 75-80% SOC. Use this voltage as absorption for your SCC.
For low voltage disconnect, 3v per cell will work well.
For low voltage disconnect, 3v per cell will work well.
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