Why LiFePo4 battery for solar system ?
Advantages of LiFePo4 battery in Solar industry
Ⅰ． Charge factor ：
1. Absorbency of LiFePo4 battery is very strong . for the LiFePo4 battery , we have 2 types, one is normal, and another is high capacity power. For the Normal one, we can reach to 3C charge ability, and if you have any special demand, you can use our high capacity power battery, they can reach to 10C charge ability .
And for the Lead Acid battery, if we use the good qualiy, they only have charge ability at 0.2C . when under the weak sunshine, the Lead Acid can not absorb the solar energy, and for the LiFePo4 battery, still can absorb, that because the LiFePo4 battery is at lower volt (just more higher than3.5V/Cell) which still can charging.
The charging rate of LiFePO4 can reach 3C.if any special requirement,it can withstand 10C charge rate.while for the high quality of lead acid battery,the maximum charge rate is only 0.2C.
when under the weak sunshine, the Lead Acid can not absorb the solar energy.but LiFePo4 battery still has strong capability of absorbing energy even under weak sunshine. Moreover,the charging voltage is relatively lower,only if the voltage is over 3.5v,the batteries can be charged and its available charging time is longer.
2. For the Lead acid battery, they only can charge (0.2C charging ability) , if over charging which will affect the lifetime of the battery, (for the LiFePo4 battery, we will design for the BMS system, which means they will prevent the over-charging and discharging which can protect the battery pack, and LiFePo4 also has the balacing function，which can keep as consistency for every battery all the time .) and here is 2C charging ability for the LiFePo4, that means its charging ability is ten times of Lead Acid battery. This characteristic plays an important role in designing of Solar modules.
For example, most strong sunshine is at noon time, if the Solar module can convert as 10A charging current, Then we need at least 50AH lead acid battery that can completely absord the charging current of 10A(since lead acid battery has only 0.2C charing capability).
However the battery lifespan is two years and it also decays during usage,then we have to add 40% more of the capacity .therefore we need at least 70ah lead acid battery to ensure it has the ability to abosorbing 10A charging current within two years.meanwhile for this 70ah lead acid battery,it can not be fully charged after
a whole day’s sunshine.but without such large capacity of 70ah,it can not absorb the current that is produced by solar pannel during its highest efficiency.thus it is a waste of energy and cost from this point.means if you use Lead Acid battery, the lead aicd battery must have 50A current ability which can absorb the 10A current from the solar modules(Charging ability). But we deduct the lifetime 2 years for the Lead Acid battery, and we also must take attenuation into consideration, means we must add 40% current , so we must need 70A current lead acid battery, can reach to our requirement which can have ability for 10A charging current about in one year time.
But after whole day’s sunshine, it can not be charged fully in the Lead Acid battery. But if you not use so big current which can not absorb the best current under best efficiency from the solar modules, so it is waste a lot.
Lead acid battery can only withstand no more than 0.2C charge rate.when over 0.2C,they are like to get damaged.while LiFePO4 battery can be charged with 2C,that is to say the charging capacity of Lifepo4 is as ten times as that of lead aci battery
3. But if you choose the LiFePo4 battery, you don’t need to consider the charging ability at all, you just need to consider how much current and power can get from the solar modules. For example, most strong sunshine is at noon time, if the solar modules can convert as 10A charging current, so it can storage 30A current at most,
that means you just need a 30Ah LiFePo4 battery and no need to consider how high or low of charging current
4． from above we can conclude that,when selecting what capacity of battery you need, you have to consider charging current for lead acid battery,while for LiFePO4 battery, you only need consider charging capacity
Why LiFePo4 battery for solarsystem?Why LiFePo4 battery for solar system ?Why LiFePo4 batteryforsolar system ? Totally not to need to consider the problem of charging current, and for the 30Ah LiFePo4 battery, its charging can reach to 90Ah which will not affect the life time or get hot.