How do you calculate the capacity of the battery properly?

Now the battery computing capacity usually use 10 hours discharge rate. Discharge current at I10 (10%) of the nominal capacity, discharge termination voltage set at 90% of U (90%) of the nominal voltage, discharge, if 10 hours after the battery is not reached termination voltage, battery capacity is 100%, if in 5 hours to termination voltage, capacity of only 50%, and so on!

【 introduction 】 battery

Chemical energy is converted into electrical energy device is called chemical battery, commonly referred to as "for the battery. After discharge, can make the internal active substances in charging way - to store the electric energy to chemical energy regeneration; When need to discharge to convert chemical energy to electrical energy again. Call this type of battery storage battery (Storage Battery), also known as the secondary battery. So-called is chemical energy storage battery, necessary release electricity an electrochemical device.

The algorithm of UPS backup time after 2010-03-25

UPS battery discharge time calculation method

1) calculate the biggest battery discharge current value:

I biggest = Pcos ф/(eta critical * * E N) note: P - the nominal output power UPS power supply

Cos ф - UPS power output of the power factor (UPS generally 0.8)

Eta to EPS inverter efficiency, average of 0.88 ~ 0.94 (the actual calculation can take 0.9)

E critical - critical discharge voltage of the battery (The 12 v battery about 10.5 V, 2 V battery is about 1.7 V)

N - the number of cells in each group

2) according to the selected battery backup time, find out the battery discharge rate value C, then according to:

The nominal capacity of the battery pack = I most C/C time and discharge rate

15 minutes 30 minutes 60 minutes, 90 minutes, 120 minutes, 180 minutes 1.98 C0.92 C0.61 C0.5 C0.42 C0.29 C

3) such as 400 kva time delay for 15 minutes

Battery rated power the maximum discharge current of 1058 a = 400000 va x 0.8 present each section efficiency (0.9 * 32 * 10.5 V batteries discharge voltage)

The nominal capacity of the battery pack = 1058 a present 1.98 C = 534.3 AH

The total capacity of the battery pack = 534.3 AH * section 32 * 12 v = 205171.2 AH so configuration section 12 v150ah32 section 4

Chemical energy is converted into electrical energy device is called chemical battery, commonly referred to as "for the battery. After discharge, can make the internal active substances in charging way - to store the electric energy to chemical energy regeneration; When need to discharge to convert chemical energy to electrical energy again. Call this type of battery storage battery (Storage Battery), also known as the secondary battery.

So-called is chemical energy storage battery, a necessary release electricity an electrochemical device.

Battery (Storage Battery) is a kind of chemical energy directly into electrical energy device, is designed according to the rechargeable batteries, rechargeable by reversible chemical reactions, usually is refers to the lead-acid battery, it is one of the battery, belongs to the secondary battery. How it works: when charging use external power to make the internal active substances, to store the electric energy to chemical energy, need discharge to convert chemical energy to electrical energy output, such as mobile phone battery is commonly used in life.

Fill it with sponge lead lead substrate grid (body) is also called the grid as negative, fill lead dioxide lead substrate grid as the anode, and the density of 1.26-1.33 g/MLG/ml dilute sulphuric acid as electrolyte. Battery during discharge, the metal lead is negative, the oxidation reaction, generate the lead sulfate; Lead dioxide is positive, reduction reaction, generate lead sulfate. When used in dc rechargeable batteries, the poles producing elemental lead and lead dioxide respectively. Remove the power supply, it back to the front of the discharge state, form a chemical battery. Lead-acid batteries can be recharged, discharge, and its monomer voltage is 2 v, the battery is made up of one or more of the monomer battery pack, referred to as "battery, one of the most common is 6 v, there are other 2 v, 4 v, 8 v, 24 v battery. With such as the car battery (commonly known as battery) is 6 lead battery series into the 12 v battery pack.

Battery diagram

Battery diagram

For traditional dry lotus lead battery (such as car dry battery, dry lotus motorcycle battery, etc.) in use after period of time to add distilled water, keep the dilute sulphuric acid electrolyte density of 1.28 g/ml;For maintenance-free battery, the using until the termination of life are no longer need to add distilled water.

The chemical principle

The equation is as follows:

Overall reaction: the Pb (s) + PbO2 (s) + 2 - h2so4 (aq) reversible symbol 2 pbso4 (s) + 2 h2o (l)

Discharge: negative Pb (s) - 2 - + SO42 - (aq) = e PbSO4 (s)

PbO2 (s) + 2 e - + SO42 - (aq) + 4 h + (aq) = PbSO4 (s) + 2 h2o (l)

The total Pb (s) + PbO2 (s) + 2 - h2so4 (aq) = 2 pbso4 (s) + 2 h2o (l)

Electrolytic cell when charging

Cathode PbSO4 (s) + 2 e - = Pb (s) + SO42 - (aq)

Anode PbSO4 (s) + 2 h2o (l) - 2 e - = Pbo2 (s) + SO42 - (aq) + 4 h + (a

Note (charging cathode discharge cathode)

The physical form

Form the main ingredients of lead-acid batteries are as follows:

Lead oxide anode plate (. PbO2) - > active substances

Lead cathode plate (sponge. Pb) -- - > active substances

(dilute sulphuric acid electrolyte) - > (- H2SO4) sulfate + distilled water (H2O)

Battery shell and cover (PPABS flame retardant)

Isolation plate (AGM)

The relief valve

Across the column, across the column, etc.

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