Storing Your LiFePO4 Battery: Best Practices for Optimal Performance

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Safeguarding Your LiFePO4 Battery for Peak Performance

The LiFePO4 battery is highly regarded for its consistent performance, exceptional safety, and ease of installation. Recognized as a leading energy solution, it's essential to address the correct storage of this powerful battery during periods of inactivity.

Why Proper Storage is Crucial

Storing LiFePO4 batteries correctly during idle times is critical to maintaining their effectiveness and lifespan. Improper storage practices can lead to over-discharge, thereby damaging the battery. Ensuring proper storage is particularly crucial for users who utilize their batteries seasonally, such as during summer camping, where the battery's idle time is extended.

Storage Guidelines You Should Follow

Creating the Ideal Environment

Ensure that the storage environment is dry and well-ventilated. It's best to keep the state of charge (SOC) at 50% or above, avoiding full SOC storage.

Summer Storage Tips

During summer, the self-discharge rate of LiFePO4 batteries can rise to about 3-4% per month. Though these batteries are durable under high temperatures, it's advisable to avoid excessively hot storage locations. A room with moderate indoor temperature is ideal.

Winter Storage Tips

Winter storage is common for LiFePO4 batteries used in seasonal activities. Cold temperatures can reduce the self-discharge rate to around 2-3% per month. Yet, extreme cold (as low as -20°C) can be harmful, so maintaining a room-temperature environment indoors is recommended.

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Essential Precautions During Storage

Disconnect all loads from the battery, avoiding any direct connections between the positive and negative electrodes. Refrain from leaving equipment such as BMS/inverters or chargers attached, as this can accelerate battery drainage. Use a battery protector if continuous connection is crucial, and re-balance the LiFePO4 battery prior to reactivation post-storage.

Optimal Storage Conditions

• For storage up to 1 month: 0°C ~ 40°C
• For seasonal storage (3 months): -10°C ~ 35°C
• Long-term storage (around 6 months): -10°C ~ 25°C
• After approximately six months of storage, conduct a full cycle with the LiFePO4 battery to maintain its performance.

Conclusion

Knowing the advantages of LiFePO4 batteries is one thing, but ensuring their longevity and efficiency demands proper storage habits. Correctly storing your LiFePO4 battery during inactive periods will extend its life and maintain its optimal performance.

LiFePO4 Best Practices - Lithium

I’m interested in what I can do to improve the likely lifespan of my two Pylontech US3000 batteries. Note that this doesn’t mean I want to necessarily apply the manufacturer’s specs. My aim is to get the longest possible life out of my batteries together with a practical amount of use. As per a previous post I made, I am concerned that the economics of a large bank doesn’t make sense (in my case, with limited back up requirements). Therefore I’d like to keep the two that I have now in service as long as possible, and therefore enabling my PV and backup system to function as intended.

Picking up a few things here and there (of which not all are necessarily correct), this is a list I put together, but would really appreciate some input on:

1. Do not use the batteries when they are too hot (how hot is too hot? Above 30C?) or at freezing point (not an issue where I stay).
2. Avoiding discharging of the batteries at more than 1C (75A per battery in my case, so 150A in total)
3. Charge them up to 100% regularly (at least once a week) and keep them at that level for an hour or two to do some balancing.
4. Do not discharge the batteries to less than 20% SoC (80% DoD).

At the moment I am leaving 1 and 2 to the batteries’ BMS to sort out with my Venus GX, so I assume that those are taken care of. For 3, I have put a scheduled charging slot, every day (stop on 20% SoC) between 16:30 and 18:30. My panels are west facing so I still get some sun during that time and the demand in the house isn’t too much, so typically my batteries gets full at around 15:30 and stay there until 18:30, trickling up every now and then with the excess PV, should the batteries demand it.

Another setting I made was to set my minimum SoC (unless the grid fails) at 50%. My reasoning being as follows: 50% DoD gives me 3.5kWh from the batteries. This is at full nominal capacity. When this becomes too little due to capacity degradation, I can move it down to 45% SoC and eventually all the way to 20% SoC. 80% DoD, with 60% nominal capacity remaining, I’d still get (1-0.2)*(0.6)*7 = 3.36kWh from the bank (what I was used to).

I’d really appreciate some input on the above.

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