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12v 24v solar battery calculation II

Shenzhen Sinoli Electronic Co.,Ltd | Updated: Jan 13, 2019

Calculate the battery panel:


1. LVD lamp 40W, current: 1.67


2. Discharge time of 10 hours per day (take 7:00 p.m. - 5:00 a.m. as an example)


3. Reserve at least 20% of the batteries.


4. Local effective light is calculated with an average of 4 hours per day.


WP_17.4V=(1.67A*10h*120%) _4 H


WP = 87W


The actual constant current source loss, line loss and other comprehensive losses are about 20%.


Actual demand for battery panels = 87W * 120% = 104W


Actual batteries require 24V/104W, so two 12V batteries are needed: 208W.


Integrated component price: positive battery board 191W, 31 yuan/watt, 6448 yuan


Battery 300AH, 7 yuan/AH: 2100 yuan or so


40W LVD lamp: about 1000 yuan


Controller (only) about 150 yuan


About 700 yuan for 6m lamp pole


The total cost of this set of components is about 10398 yuan.


II. 40 W Option Configuration II (with regulated power)


1. LVD lamp, single channel, 40W, 24V system.


2. Effective illumination on local day is calculated in 4 hours.


3. The daily discharge time is 10 hours (take 7:00 p.m. - 5:00 a.m. as an example) through the controller at night.


The power of LVD lamp can be adjusted in different periods to reduce the total power consumption. The actual discharge time is 7 hours per day.


Example 1: 100% power from 7 p.m. to 11 p.m. and 50% power from 11 p.m. to 5 a.m. Total: 7h)


(Example 2: 7:00-10:30 is 100%, 10:30-4:30 is 50%, 4:30-5:00 is 100%)


4. Satisfy 5 consecutive rainy days (plus 6 days of electricity used overnight before rainy days).


Current = 40W_24V


= 1.67 A


Calculated accumulator = 1.67A*7h*5+1 day


=1.67A*42h


= 70 AH


Reserve 20% capacity for battery charging and discharging, and the actual current of street lamp is over 2A (plus 20%).


Losses, including constant current sources, line losses, etc.


Actual battery demand = 70AH plus 20% reserved capacity plus 20% loss


70AH_80%*120%=105AH


The actual battery is 24V/105AH, which requires two groups of 12V batteries totally: 210AH.


Calculating the Battery Plate


1. LVD lamp 40W, current: 1.67A


2. Discharge time is 10 hours per day. After power regulation, the actual calculation is based on 7 hours (power regulation is the same as storage battery).


3. Reserve at least 20% of the batteries.


4. Local effective light is calculated with an average of 4 hours per day.


WP_17.4V=(1.67A*7h*120%) _4 H


WP = 61W


The actual constant current source loss, line loss and other comprehensive losses are about 20%.


Actual demand for battery panels = 61W * 120% = 73W


Actual batteries require 24V/73W, so two 12V batteries are needed: 146W.


Simple and practical: Solar street lamp configuration calculation method:


1:


Module power = load power * working time /(local sunshine coefficient * 0.85 * 0.8 * 0.8)


0.85: Redundancy factor of components 0.8: efficiency factor of storage battery 0.8: working efficiency of the whole system


The above coefficients can fluctuate slightly according to environmental conditions (dust, temperature, etc.) and product quality.


It can also be simplified as: component power = (load power * working time) / (local sunshine coefficient * 0.544)


Light source: 14W working hours 8 hours, rainy days 4 days, assuming local sunshine coefficient: 5 (hours)


System Voltage: 12V


(14*8)/(5*0.544)=41W module power available: 40W


2:


Battery capacity = working current * working time * (rainy days + 1)} / 0.8


+1: Add the previous night's number of days, 0.8: battery utilization factor


Working current: 14/12 = 1.2A


Battery capacity={1.2*8*(4+1)}/0.8=(1.2*8*5)/0.8=48/0.8=60ah


Battery capacity: 12V60ah


3:


Controller has limitation of working current: so it is enough to exceed the working current of the system.


Controller: 12V5A


However, the price of 5A and 10A of the controller is similar, but 10A is slightly more efficient, usually 12V10A.