How to calculate the configuration of lead acid batteries in the solar system?

What is the load voltage? What is the budget? What is the life expectancy? Are there other configurations, such as rectifier, oil engine, etc.?

Nowadays, the batteries used in the more mature solar systems are all 2V batteries.

Suppose it: if it is a 48V system, the power is 56W, then the working current is within 2A, the working time is 9 hours a day, that is, the discharge is less than 20A per day, and the maximum is 3 days when there is no sunshine, that is, the discharge is 144A, so it is recommended to use 200Ah batteries, that is, 24 200Ah batteries as backup power.

200ah battery, the discharge depth is 20 200 on weekdays, that is, ten percent, and the discharge depth is 144 200, that is, 72% when there is no sunshine, which can meet the demand. The service life depends on the operating temperature and other configurations, etc., to be determined.

Selection principle: The battery should meet the actual usage. That is, the maximum backup time is met.

From the load and working voltage, the working current is calculated, and the working current is recommended to be less than 10% of the battery capacity.

The minimum amount of power required for the battery is calculated from the load current and the maximum backup time. In terms of service life, this value should be within 80% of the battery capacity.

Considering the budget, if the budget is large, you can consider multiple groups in parallel or choose gel batteries.

Solar Relations Network to check it out.

First, the composition is different.

1. Solar battery: It is the application of 'battery' in the differential volt power generation of solar light cooker, and there are four kinds of lead-acid maintenance-free storage branch pond, ordinary lead-acid battery, colloidal battery and alkaline nickel-cadmium battery. The most widely used solar batteries are:

Lead-acid maintenance-free batteries and gel batteries, these two types of batteries.

2. Lead-acid battery: the electrode is composed of lead and lead oxide, and the electrolyte is an aqueous solution of sulfuric acid.

Second, the advantages and disadvantages are different.

1. Solar battery: it has the characteristics of "free" maintenance and less pollution to the environment.

2. Lead-acid battery: the main advantage is stable voltage and cheapness; The disadvantages are low specific energy (i.e. energy stored per kilogram of battery), short service life and frequent routine maintenance. The life of the old ordinary battery is generally about 2 years, and the height of the electrolyte needs to be checked regularly and distilled water is added.

Third, the application is different.

1. Solar battery: used in reliable solar power supply system, especially for unattended workstations.

2. Lead-acid battery: used in tractors, tricycles, car starters, etc., while maintenance-free lead-acid batteries have a wider range of applications, including uninterruptible power supply, electric vehicle power, electric bicycle batteries, etc. Lead-acid batteries are divided into constant current discharge (such as uninterruptible power supply) and instantaneous discharge (such as automobile starter battery) according to the application needs.

1. Determine the battery capacity according to the needs of electricity consumption, time (hours) = battery voltage (v) * battery capacity (ah) * 80% * 70% power consumption (w), in the formula for calculating the battery power time, 80% means that the battery can only use up 80% of the power, and after using photoelectricity, the battery life is shortened by 80%, and the inverter.

The efficiency is about 70%, 2, solar panels.

Design, the solar output voltage for 12V battery charging is 18V, calculated according to 9 hours of sunshine per day, search the local perennial sunshine days on the Internet to determine the charging current, charging current = battery capacity * 80% * 130% * 150% 9, 3, when charging, the battery is to convert electrical energy into chemical energy.

The conversion efficiency is about 50%, 4. When discharging, the battery can only discharge 80% of the power, over-discharge, which will shorten the life of the battery, and the over-discharge of the battery will shorten its life by 80%, 5. The average efficiency of the charger is about 70%.

There are two types of photovoltaic batteries, one is lead-acid battery and the other is gel battery.

In fact, both of these belong to lead-acid batteries, but the latter is new, the advantage is that the high temperature and low temperature resistance characteristics are good, the capacity is higher, the disadvantage is that it is higher, and it is mostly used in solar street lights. And the advantage of the former is that it is cheaper. The disadvantage is that the temperature resistance characteristics are not too good, and it is mostly used in solar power stations.

One is a lead-acid battery and the other is a gel battery.

Roughly the same, industrial batteries are lead-acid batteries for alternating current charging, and lead-acid batteries are also used for solar energy, and some solar energy uses lithium batteries with better performance, or nickel-metal hydride batteries, sunlight charging or alternating current charging.

The focus of the vehicle battery is that the instantaneous discharge current should be large, and the starter needs a large current when the vehicle is started.

The discharge current of solar batteries is generally relatively stable, and generally does not appear to be very current in a short period of time.

Therefore, the electrodes of vehicle batteries are cylindrical made of lead, and copper sheets are generally used as electrodes for solar energy.

The so-called "solar battery" refers to a battery specially designed for use in solar photovoltaic power generation systems.

The main differences between it and the lead-acid battery for vehicles are:

1.The special solar battery is usually a maintenance-free lead-acid battery, and the one on the car needs to be maintained;

2.Solar batteries are usually gel batteries with other components (such as sodium silicate) added to the traditional electrolyte, which are safer than ordinary lead-acid batteries used in cars, but the self-discharge is more obvious;

3.Solar batteries have a wider range of adaptability to charging voltage and temperature.

The solar special battery is an energy storage type with a small discharge current; Lead-acid batteries for vehicles are powered and can withstand large discharge currents.

Hello, generally speaking, the capacity of the solar panel on the solar panel calculator is very small, only a few tenths of a volt-ampere, and the basic voltage is also very small. The charging principle of the battery is that the battery voltage is in the positive direction when the output current is discharged, if the direction of the current output is the direction of the battery voltage, the battery is in a charging state, but to achieve this state, the applied voltage must be greater than the battery voltage. But what?

If you're trying to store electricity, you won't be able to store a small battery for a few cents, even if you leave your calculator in the sun all day long. That's why there's no need for that.

Maintenance-free also requires liquid addition, and the electrolyte inside will evaporate after a long time, and the instantaneous current and rated capacity of the battery used with the system must meet the working requirements.

The nature is similar, and the maintenance-free inside is also an electrolyte, and the water battery is not always maintained.

I use liquids for solar energy.