Faq

A solar battery is a battery that stores energy from a solar PV system when panels absorb energy from the sun and convert it to electricity through the inverter for your home to use. A battery is an additional component which allows store energy produced from your panels and use the energy at a later time, such as in the evening when your panels are no longer producing energy.

For an off-grid system, your solar PV system is connected to the electricity grid, which allows your home to continue to receive electricity if your panels aren’t producing enough to meet your energy demands. When your system production is more than your energy consumption, the excess energy gets sent back to the grid, you will get a credit on your next electricity bill which will reduce your payment amount with hybrid inverter system. But for those who are off-grid or would rather store the excess energy themselves instead of sending it back to the grid, solar batteries can be a great addition to their solar PV system.

When choosing the type of battery to use for energy storage, consider the following:

1. Battery life and warranty
2. Power capacity
3. Depth of discharge (DoD)

LISUN Power battery is working with the longest cycles Lifepo4 cells and generally battery lifespan from five to 15 years, warranties for batteries are stated in years or cycles. ( 10 years or 6,000 cycles )

Power capacity refers to the total amount of electricity that the battery can keep. Youth Power Solar batteries are usually stackable, meaning you can have multiple battery storages at home to increase capacity.

Battery DOD measures the degree to which a battery can be used relative to its total capacity. If a battery has a 100% DoD , means you can use the full battery storage amount to power your home. LISUN Power battery encourages with 80% DOD for the purpose of longer battery lifespan cycles while lead acid battery has quite a low DOD and outdated.

Capacity is the total amount of electricity that a solar battery can store, measured in kilowatt-hours (kWh). Most home solar batteries are designed to be “stackable,” which means that you can include multiple batteries with your solar-plus-storage system to get extra capacity.

While capacity tells you how big your battery is, it doesn’t tell you how much electricity a battery can provide at a given moment. To get the full picture, you also need to consider the battery’s power rating. In the context of solar batteries, a power rating is the amount of electricity that a battery can deliver at one time. It is measured in kilowatts (kW).

A battery with a high capacity and a low power rating would deliver a low amount of electricity (enough to run a few crucial appliances) for a long time. A battery with low capacity and a high power rating could run your entire home, but only for a few hours.

Deep Cycle battery is a kind of battery that focused on deep discharge and charge performance.

In the traditional concept, it usually refers to lead-acid batteries with thicker plates, which are more suitable for deep discharge cycling. It includes Deep Cycle AGM Battery, Gel Battery, FLA, OPzS, and OPzV battery.

With the development of Li-ion battery technology, especially LiFePO4 technology, the meaning of deep cycle battery extended. Due to its safety and super long cycle life, LFP battery is more suitable for deep cycle applications.

In recent years, with its light weight, environmental protection and long service life, lithium solar batteries have become more and more popular, especially after many first-tier cities have released the legal license of electric vehicles, the lithium solar batteries of electric vehicles have gone crazy again. Once, but many small partners do not pay attention to daily maintenance, which often greatly affects their life cycle. How to maintain and maintain lithium solar batteries?

 

1. Using the original charger for charging can play a role in protecting the circuit to maintain the power circuit.

2. Moderate charge and discharge to prevent damage; overcharge and overdischarge will cause damage to the rechargeable battery. Therefore, do not wait until the battery is exhausted to recharge, and do not need to charge for a long time. Generally, keep the battery for one to one after the charger light turns green. after two hours;

3. Pay attention to the natural environment of battery charging to avoid safety risks; charging in rain and snow in winter can easily cause short circuits, and in summer, charging in hot sun can easily cause spontaneous combustion. For safety, you should choose a dry, ventilated, and cool environment.

Storage System Configuration:

1. Battery configuration and calculation

1.1.Battery capacity：

E= (Battery module voltage(V) x Battery module capacity (AH) x Module number/1000) KWH

e.g.：The battery module is 48V/50AH, 4PCS in parallel

E=48V*50AH*4/1000=9.6kwh

1.2. SOC：F

State of charge，Battery total capacity divided by battery remaining capacity.

E.g. 9.6kwh SOC=0.8，E=9.6kwh*0.8=7.68kwh。

1.3. DOD：

Depth of discharge: Percentage rate of battery rated capacity divided by battery discharged capacity.

e.g.：9.6kwh DOD=50%，the discharged capacity E=9.6kwh*50%=4.8kwh。

1.4. Charge Discharge Ratio C：

C：The rated current divided by the current when charging and discharging

e.g.：100AH battery allow 1C discharge，0.5C charge，means discharging current is 100A, charging current is 50A.

1.5. System Storage Design:

1.5.1 General restrictive factor, e.g. the max charge & discharge current shall not be higher than battery charge & discharge ratio C.

1.5.2. Load day power consumption, lasting time, DOD

e.g. load day power consumption Ed=3kwh, lasting time is 2 days, DOD is not over 60%, the energy storage capacity shall be as below:

E=Ed*2/DOD=3kwh*2/60%=10kwh

Verify：For 50V system, battery capacity is 200AH，allowing max 0.25C discharging, the max discharging current is 50A. Then check the peak power of the load to see whether the discharging current is enough, if not，the system storage capacity shall be increased or system voltage can be raised.

2. PV configuration

2.1. Before configure the PV, please check the PV data for PCS:

Take the PV in the table for example:

PV Data
Max PV Power	4200W	5400W
Max PV Voltage	580Vdc
MPPT Voltage Range	125-550Vdc
Max DC Current	15A/15A
Input Strings/MPPT Tracker	2/2 ( parallel enabled)

2.2. Firstly to confirm the system day generation:

Two factors to determine day generation：one is day consumption，the other is feeding in grid ratio

e.g.：day consumption is 10kwh（part of energy will be consumed directly in daylight，the other part will be stroed and used at night），feeding in grid ratio is 30%. System efficiency 95% .

The day generation is Ewp=10kwh/（1-30%）/95%=15kwh（considering system loss)

2.3. Calculate PV system capacity and panel config:

System storage is based on day generation and average sunshine duration：

Wp=Ewp/Hd（Hd is 3.5 hours as an example）=15kwh/3.5h=4.3kw

Then calculate the panels quantity based on the one panel:

N=Wp/We(We is 250Wp as an example）=4.3kw/250w=18PCS

Two independent MPPT Input，9PCS of panels for one string

Verify：

250Wp mono or ploy panel，open circuit voltage is about 43.7V，MPPT voltage is about 37V

Voc（open circuit voltage）=43.7*9=393V

Vmppt=37*9=333V

2.4. Installation

Each MPPT string has below requirement:

–Same model

–Same panel quantity for each string

–Same deployment

–Same angle

3. Determine factor for system power

3.1. Backup Load:

It indicates the loads that need hybrid inverter to power when they are off grid, so the backup load power shall not be higher than the backup power of the hybrid inverter.

3.2. Bypass Load:

It indicates the loads that can be powered up when they are on grid. It depends on the system grid input power, which is our configured MCB and Meter.

4. Load Configuration

4.1. The system has two load terminals: one is for Backup，the other is for Bypass.

Take the PCS in the table for example:

Rated Power		3.6kva	4.6kva
Max Continuous Output Power	Back-up	3.6kva	4.6kva
Bypass	5.7kva	7.3kva

4.1.1. Backup Load is the loads that can be powered up when there is off grid. If there is grid, the loads can be powered up by PV, battery or grid based on the system working mode. When grid is off, the loads will be powered up by the PV, batter.

Backup power depends on the output power of the PCS.

4.1.2. Bypass load is the loads that can be powered up only when there is on grid. And it can be powered up by PV, battery and grid if there is grid. Once grid is off, the bypass load will be powered off.

Bypass power depends on the grid capacity and the internal MCB current.

LISUN POWER offers a 10-year full warranty on all its components. This means that your investment is protected for 10 years or 6,000 cycles, whichever comes first.

Many times the battery we use is with certain capacity, but many of us hope that the higher the battery capacity, the better. Generally speaking, the higher the capacity, the higher the battery quality. Is there any way to solve this problem? That is to increase the battery voltage.

According to laboratory statistics, when the voltage rises, in the same discharge time and the same capacity, the time for a battery with a normal voltage to run out is lower than the time for a battery with a high voltage to run out. This fully shows that high-voltage batteries can extend the working of the battery.

What are the characteristics of high-voltage battery modules?

High-voltage batteries mean high energy density and high discharge platform. Under the same conditions of use, high-voltage batteries can release more capacity. So its battery life is longer and its power is stronger. Under normal circumstances, the battery life of UPower’s high-voltage battery will increase by 15%-25%. This is also one of Upower’s core technologies. It has the following advantages:

1. High energy density, longer battery working time, up to 15% than ordinary batteries;

2. The discharge platform is high and stable, and frequent use does not affect the life of the battery;

3. The cycle performance can meet the requirement of SOC 80% of the original capacity after 4000 times;

4. Reliability test is carried out by simulating actual use, which can meet the service life of 10 years and meet the requirements of different requirements for power industry applications;

5.LISUN POWER have the capability of mass production and good battery consistency.