Hi there! Thanks for writing in.
A 5kw solar system requires at least 200Ah of battery storage. To calculate this, you can use the following formula:
5kw = 5,000 watts
5kw x 3 hours (average daily sun hours) = 15,000Wh of energy per day
200Ah of storage will hold enough energy to power the entire house for about 3 hours. So if you have a 5kw solar system that runs from dawn until dusk every day, it&#;ll need 200Ah of storage capacity.
You will need two 200 Ah batteries for a 5kw lithium ion battery. The capacity of the battery is measured in Amp-hours, or Ah. A 100 Ah battery will be able to discharge at a current equal to its capacity for 100 hours. So, a 200 Ah battery will be able to discharge at a current equal to its capacity for 200 hours.
The solar panel you choose will determine how much power your system will generate, so it&#;s important to make sure that the number of batteries you purchase matches up with the wattage of your panels. For example, if you have a 2kW solar panel and choose to use 400Ah batteries, then you&#;ll need four of them&#;two in each battery compartment (or &#;string&#;).
If you have multiple strings&#;for example, one string per room&#;then you can add more batteries for redundancy purposes. In this case, each string would need two 200Ah batteries connected in parallel; this means that if one battery fails in one string, there will still be enough power from the other connected batteries in that string to keep going until repairs can be made.
Link to GECONA SOLAR
When planning for backup power or off-grid energy solutions, knowing how long a battery will last is crucial. A 200Ah (amp-hour) battery is a common choice for many applications, including solar power systems, RVs, and backup power for homes. To accurately determine how long a 200Ah battery will last, several factors must be considered.
This article uses a 200Ah battery as an example to explore the factors affecting battery runtime and provides a detailed method for calculating it. We will explain the relationship between battery capacity and the number of hours household appliances can run, as well as how to predict battery backup time based on energy demand.
Before the explanation on how long will a 200Ah battery run, it&#;s necessary to clear one thing up: There is no way to calculate the running time of battery precisely, because it is influenced by many factors.
However, we can consider 5 key factors to estimate the running time as accurately as possible for optimal battery use.
The voltage in a battery refers to the potential difference between the positive and negative terminals of the battery. But the battery voltage will gradually decrease as the power passes, so we just can use the nominal voltage of the battery(12v, 24v, 36v,48v) to estimate the battery run time.
Battery capacity, measured in amp-hours (Ah), is obvious from the name, it is Current x Time. According to Charge Conservation, Ah can be interpreted as the amount of charge for charging and discharging in a lithium battery during a certain period of time. A 200Ah battery, theoretically, can deliver 200amps of current for one hour or 20 amps for 10 hours.
Usually, the voltage and ampere-hours together indicate the capacity of the battery, such as 12V 200AH, 12V 100AH. The same voltage of the battery, the higher the ampere-hour, the larger the capacity.
For a more direct understanding, it's practical to convert ah to kwh, because it's a standardized way to measure and compare energy capacities and consumption. This is especially useful when comparing different energy sources or storage systems.
Depth of discharge(DoD) is the ratio of the power released from the battery to the rated capacity of the battery.
For example, the rated capacity of the battery is 200Ah, the capacity remaining after discharge is 100Ah, the actual discharge capacity is 100Ah, then the depth of discharge of the battery is 50%.
Usually, the battery with the depth of discharge from 10% to 80% is called shallow cycle discharge battery, and another with the 80% depth of discharge is deep cycle battery.
The two main types of solar batteries in this size range are lead acid battery and lithium phosphate battery. Each has its own pros and cons. Lithium phosphate batteries are more expensive but offer significant benefits, the most notable being their intrinsic deep-cycle capability.
Energy consumption is the amount of power that your devices use, typically measured in watts (W). To calculate battery runtime, you need to know the total energy consumption of all devices that will be powered by the battery. This includes everything from lights and appliances to electronic devices. Knowing the total wattage of the devices will run is necessary for an accurate calculation.
The efficiency of the inverter, expressed as a percentage, indicates how much energy it converts from the battery's DC power into the AC power needed by most appliances. No inverter is 100% efficient; some energy is always lost in the conversion process. Higher efficiency means less energy is wasted, resulting in longer battery runtime.
To calculate how long a 200Ah battery will last, you can use the following formula:
If you want to learn more, please visit our website Home Solar Lithium 48v 200ah LiFePO4 Battery.
Battery Run Time = (Battery Capacity x Battery Voltage x Depth of Discharge x Efficiency of Inverter) / Energy Consumption
We can estimate the runtime of a battery by either assuming the inverter operates at full rated power or by summing the power of all connected devices. Below, we will demonstrate these two methods to determine how long a 200Ah battery will last.
Let's calculate the backup time of a 48V 200Ah battery, using the PowMr 48V 200Ah battery (80% Depth of Discharge) paired with a W inverter boasting 95% efficiency.
Rated at 48v, a 200Ah battery connected to a W inverter(95% efficiency) working at full rated, it will last for 2.432 hours.
200Ah battery run time = (200Ah x 48v x 0.8 x 0.95) / W = 2.432 Hours
Moreover, if solely powering a 400W fridge with this 200Ah battery, it could run for approximately 18.24 hours.
200Ah battery run time = (200Ah x 48v x 0.8 x 0.95) / 400W = 18.24 Hours
Given that two parallel-connected 100Ah batteries (DoD 100%) form a 12V 200Ah battery system, and are connected to a W inverter for 12v battery (operating at full rated capacity with 92% efficiency), it will last approximately 1.104 hours.
200Ah battery run time = (200Ah x 12v x 0.92) / W = 1.104 Hours
Moreover, if you are using a 12V 200Ah battery solely as a backup to power a small 400W fridge in your RV, it could run for approximately 5.52 hours.
200Ah battery run time = (200Ah x 12v x 0.92) / 400W = 5.52 Hours
Assume a 24V, 200Ah battery system composed of four 12V, 100Ah batteries (DoD 100%), configured with two batteries in parallel (200Ah) and then connected in series to achieve 24V. This setup powers a W inverter with 92% efficiency.
Related Post:
Wiring Batteries in Series vs Parallel in Solar Power System
When the W inverter is operating at full capacity, the 24V, 200Ah battery system will last for approximately 2.208 hours.
200Ah battery run time = (200Ah x 24v x 0.92) / W = 2.208 Hours
If the energy from the battery is used to power a 400W appliance, the 200Ah battery can run for approximately 11.04 hours.
200Ah battery run time = (200Ah x 24v x 0.92) / 400W = 11.04 Hours
The company is the world’s best Cheng Longjia supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.