Lead acid battery kinetics questions,how to fix a rusted battery compartment,new car battery pre charged quartz,isuzu truck battery replacement instructions - Good Point

02.01.2014
Fully Charged Mode: LED is Green, Reaching this stage may take some time, longer battery life can be preserved by avoiding fully charging. The charger should be horizontally place and operate in well ventilated condition, avoid from wet and keep it away from inflammable explosive material.
Using this to keep a 20 Ah gelcel battery charged that runs a 12Vdc pump that pressurizes our water supply. Instead it gracefully accepts the occasional 10A draw from the battery, and then happily tops it up -- no errors, no mysterious shutdowns.
It is critical to continuously monitor and report the battery’s state of charge (SoC) and state of health (SoH). Nothing wrong with Battery Junction, but they would sell a lot more via Amazon, and then I could count on the product persisting in the marketplace (and perhaps being upgraded with a thermostatically controlled fan). This article discusses in depth why accurate monitoring of these battery parameters is essential and how that monitoring will benefit end users. Lead-acid batteries have been in vogue since 1859 and are still popular due to their rugged design, lower cost and better recycling infrastructure [1].
They have been the battery of choice for automotive application such as starting-lighting-ignition (SLI) and for motive applications such as boats, forklifts and golf carts that involve deep discharge.
With the proliferation of data servers and remote wireless base stations, battery backup has become indispensable — and again lead-acid batteries have been the preferred choice.
In all of these applications, it is essential to monitor and report the battery’s state of charge (SoC) and state of health (SoH) instead of just monitoring the battery terminal voltage.


For battery backup applications, it is critical to know whether the battery can deliver the required power when called upon for service since the impact from loss of mission-critical data or wireless coverage would be significant.
State of charge and state of health State of charge (SoC) of a lead-acid battery, expressed in %, is the ratio of the remaining capacity (RC) to the full charge capacity (FCC) (see Fig. FCC is derived from battery full chemical capacity (QMAX) and battery impedance (RBAT) (See Fig.
For example, for a new lead-acid battery of 100 Ah design capacity, when it is fully charged, the SoC is 100% since the FCC is 100 Ah and RC is also 100 Ah. As the battery ages, its full chemical capacity (QMAX) tends to be lower than the design capacity due to chemical degradation. SoH monitors this chemical degradation and is reported in % as the ratio of the FCCH to the design capacity, where FCCH is FCC at 25°C for design charge or discharge rate (Fig. For example, if the battery with design capacity of 100 Ah has a FCCH of only 85 Ah after one year in use, then its SoH is 85%. In short, SoC indicates how much charge is left before a recharge is needed, while SoH indicates when a battery will have to be replaced. The biggest impact comes from the chemical kinetics during charge and discharge of the battery.
To get a reasonable estimate of the SoC from voltage measurement, the battery needs to rest for at least few hours (for example, four hours) to attain equilibrium before the open circuit voltage (OCV), in other words, no-load voltage, can be measured. See Table 1 for the Battery Council International (BCI) recommended values for a 12-V lead-acid starter battery [2].


While an approximate SoC can be assessed at rest state, it is not possible to continuously assess it during charge and discharge by voltage measurement. Also, it is not possible to assess SoH with just terminal voltage measurement since it does not fully reflect the impact from battery aging.
Measuring specific gravity (SG) of the battery electrolyte is another approximation method that is applicable to the flooded lead-acid battery type. But this method also suffers from lack of SoH information, from limitations due to temperature effects, stratified electrolyte concentration, and from the need for the electrolyte to stabilize before taking the SG reading. TI’s bq34z110, the latest lead-acid gas gauge, uses Impedance Track gauging technology to accurately monitor and report SoC and SoH of the battery [3]. When the battery is in rest mode and when the current is below a user chosen threshold, the SoC is determined using the measured battery voltage and a predefined OCV to SoC relationship table that is temperature compensated and unique to that battery type and chemistry [4]. During charge and discharge, the SoC is continuously calculated using FCC and RC while the SoH is calculated using FCCH and design capacity. Both the SoC and SoH calculations depend on an accurate estimate of QMAX and battery impedance (RBAT).
With nearly two decades of engineering experience, he has been awarded nine patents, with another six in review.



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