In the last article, we learned what kind of lithium battery is the best value for you. In this article, we focus on 'what lithium battery size is the best for your application', our new lithium battery will feature a storage capacity measured in amp hours, large lithium batteries typically feature large storage capacity, with lithium ion battery offering more space efficiency than lead acid.
Image that last year during holiday period with some friends you planned to go to 3 days trekking in the wilderness. No food or water was available during the trip. So you had to figure out how much you had to carry with your friends. Not carrying enough food and water could be risky because you could run out of supplies. Carrying too much food and water would put too much weight in your backpack. It was not an easy decision.
A similar problem occurs when designing battery capacity. Your lithium battery must be large enough to meet your energy needs, but also small enough to reduce the total cost of the system.
｜Some application examples to show you how to choice the size of lithium battery
- Motor backup
How to calculate lithium battery capacity for your motor backup? You need three key elements of information:
1. Motor--need to confirm the power & voltage & efficiency of the motor,
2. Mileage--need to confirm what supportive mileage you need from the lithium battery;
3. Average speed--need to confirm average speed.
After you know the parameters above, follow these procedures when calculating the required lithium battery capacity of your motor backup:
Rated current = Rated motor power / Rated voltage;
Mileage Time = Mileage / Average speed;
Lithium battery capacity = Rated current* mileage time / Motor efficiency/ Lithium battery efficiency /Lithium battery DOD
Let’s make an example:
The motor rated parameters are 48V1000W, the mileage you need is 120km, the average speed is 40km/h, so what is the required lithium battery capacity?
Rated current of motor need = 1000W/ 48V = 21A
Mileage time = 120km / 40km / h = 3h
(80%DoD) Lithium Battery capacity = 21A*3h/80% /99%/80%= 100Ah
(100%DoD) Lithium battery capacity = 21A*3h/80% /99%/100%= 80Ah
Yilink lithium motor battery able to achieve 99% efficiency and deep cycles. So you need Yilink 48V80Ah to 100Ah motor backup lithium battery by calculation.
- Energy backup / Uninterrupted power / Solar system
How to calculate lithium battery capacity for solar system or your UPS? Adding up all the watt values of every appliance in your home, factory or data room to know how much energy your facility is consuming daily. You could also use your monthly electricity bill to estimate your average energy consumption per day. You need three key elements of information:
1. Average Load – what is your facility’s average load power daily (kw);
2. Max. load – What is your max. power device, what its power (kw)?
3. Hours— How many hours you need the lithium battery to run after fully charged;
4. Inverter-what is your inverter efficiency.
After you know the parameters above, follow these procedures when calculating the required lithium battery capacity of your energy backup or solar system.
Let’s make an example:
You daily energy consumption is 1500W with 5 hours backup time using 48V lithium battery that have 80% DOD, and your max. power device is 3500W so the required lithium battery capacity is:
Lithium battery energy = 1500W*5h /97%/80% = 9665Wh
Lithium battery capacity = 9665Wh /48V = 200Ah
Lithium battery need to support max. discharge current: 3500W/48V = 73A
You need a 48V200Ah solar lithium battery pack by calculation. And the lithium battery needs to able to support max. 73A, 3500W power.
- Outdoor adventure / emergency power supply
I believe that with the understanding of the capacity of the energy storage backup, the portable multi-functional energy storage station is much simpler, because it is an integrated system, only need to know the load power and load usage time, then the capacity can be calculated.
Let’s make an example:
You need 100W with 5 hours backup time using lithium batteries, and the required lithium battery capacity is:
Battery energy = 100W*5h /99% = 505Wh
So Yilink 600W portable multi-functional power station would be the great choice for your by calculation.
- Electronics
From the above calculation of the battery size, we can see that for polymer lithium batteries, there will be restrictions on the size, because most of them are installed in the inherent size space. It belongs to the custom type, and the general demanders will provide the litium battery capacity.
In the next article, we will focus on 'Lithium ion battery terminology' to further expand the knowledge of Yilink lithium battery.
Stay tuned!
