Growatt DC Battery Storage

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Growatt New Energy Technology Co.,Ltd was established in 2010, focusing on providing solar inverters and system solutions for global market.

Growatt has an R&D team of more than 100 engineers, 40% of which have more than 10 years PV experience. Growatt's mission is to increase availability and efficiency, whilst applying continuous innovation to make Growatt products a cost effective yet quality choice. Growatt's self consumption solution is fast becoming a popular choice for those wanting to be less reliant on the grid.

How does this Self Consumption Solution Work?

A Growatt DC Battery storage device, such as the Growatt SP1000 , Growatt SP2000 or Growatt SP3000 is a charge controller that is added to the DC strings.

The controller constantly monitors the demands in the building and either lets the energy through to the inverter (where it is converted to AC as normal), or diverts it to the battery if the energy isn't needed in the building at that time. Once the demands in the building are greater than the available solar PV generation, the battery will start to discharge.

This type of battery system can be retro-fitted easily to an existing PV system and will work with almost any type of PV inverter. (DC to DC conversion (from controller to battery and back) losses must be taken into account. The amount of energy going through the generation meter will be lower.)

If the battery is fully charged, and there’s no demand for PV power in the building, it will be exported to the grid as normal.

This solution is unsuitable for grid backup use.

The Growatt SP1000 & Growatt SP2000 charge controllers are only a single MPPT, so can only work with DC strings from one roof elevation.

The Growatt SP3000 charge controller is designed for dual MPPT solar system arrays, i.e. PV panels on two different facing elevations.

Home Switch Ltd offer the Growatt battery storage solution, combining a battery controller and a lithium battery product - the perfect solution for self Consumption

Growatt DC Battery Storage Systems


Dual
MPPT

  1. Growatt SP1000
    Growatt SP1000
    The Growatt SP1000 DC battery based storage system is suitable for both adding in to pre-installed arrays and including during the installation of new ones. It has an internal DC switch and is a self-consumption unit with an extendible storage capacity. It is also compatible with RS232, Ethernet and Wi-Fi connections and comes with a comprehensive warranty program.
  2. Growatt SP2000
    Growatt SP2000
    The Growatt SP2000 DC battery based storage system is suitable for both adding in to pre-installed arrays and including during the installation of new ones. It has an internal DC switch and is a self-consumption unit with an extendible storage capacity. It is also compatible with RS232, Ethernet and Wi-Fi connections and comes with a comprehensive warranty program.
  3. Growatt SP3000
    Growatt SP3000
    The Growatt SP3000 DC battery based storage system is suitable for both adding in to pre-installed arrays and including during the installation of new ones. It has an internal DC switch and is a self-consumption unit with an extendible storage capacity. It is also compatible with RS232, Ethernet and Wi-Fi connections and comes with a comprehensive warranty program.
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About Growatt DC Battery Storage Systems

The Growatt SP1000, SP2000 & SP3000 Energy Storage System stores excess renewable energy power in a Lithium battery storage pack, giving around 2.5kw to 4kw of power which can be drawn when the PV panels are not generating.  This simple system can be retrofit to most standard Solar PV installations.

This Growatt SP1000 & SP2000 systems are a single MPPT tracking system only and is not compatible with micro-inverters or optimisers. Attention must be paid to compatibility of any inverters including voltage parameters. If necessary check compatibility. 

The Growatt SP3000 is a dual MPPT tracking controller and both DC and AC charging capability.

The Lithium Battery Pack is either a 1 x 2.7kw or 2 x 5kw 48HA 52v batteries in a single cabinet. These battery management systems gives a total capacity of 2.7kw or 5kw of which 80% can be drawn (you cannot 100% empty a battery) leaving 2.16Kw or 4kw available. The battery packs have there own inbuilt battery management system which manages the usage, temperature and performance of the batteries to retain the best lifetime performance possible. These batterys pack are installed close to the Controller unit and is connected by 2 cables – one for communication and one for transferring the power.  

The Sensor clamps on to the AC supply to the property. This then provides the information as to the flow of electricity in and out of the property, allowing the Controller to manage the newly generated DC power. The Sensor is connected vial an RJ45 cable which has a range of up to 25m, so attention is necessary when surveying an installation to ensure that access is possible for the sensor. Attention must be paid to the arrow on the Sensor which indicates the correct position for installation, putting it in the wrong way around will risk reverse information.

The Growatt SP1000, SP2000 & SP3000 Storage Systems stores DC electricity straight from the PV panels into a Lithium battery storage pack. The Growatt SP Storage System solar battery storage has a useable capacity of 4kw from fully charged. As renewable energy PV power is generated throughout daylight, the controller manages the available renewable energy power and ensures the most efficient use of the PV generated power. Priority is given to the property demands, with the Lithium battery storage being prioritised next and lastly the power will be exported to the grid.
EVEN THE STORED ELECTRICITY STILL GOES THROUGH THE GENERATION METER, so you are still paid for it, the renewable energy power simply comes from the solar battery storage as it is required instead of instantly as it is generated.

The system does not know if it is daylight or not, so on the occasion that it is during the day but there is low renewable energy generation from the PV but the house requires power, the solar battery storage will still discharge available power from the battery store.

Single MPPT Tracking:
The Growatt SP1000 & SP2000 Storage System controller is designed to accept multiple string input into the solar battery storage, but only on a single MPPT installation.
Where you have single or double string single tracking installations, you can put one or both of the string inputs into the inverter. This means that if you have Dual Tracking ( 2 MPPT) which is generally used for split installations such as East and West , or an odd number of panels per string, such as 9 and 6 panels, you can only use one of the strings for the solar battery storage. For more clarification or guidance contact your distributor.


Duel MPPT Tracking: 
The Growatt SP3000 has purposely been designed and built for Dual MPPT tracking PV systems.

The Growatt DC Battery Storage System:
There are 3 main parts to the Growatt SP2000 Storage System - The Controller, the Lithium Battery pack, and the Sensor.
The Controller can manage PV renewable energy installations from 2-8kw in total. The more renewable energy PV  on the installation, the more residual power will be available to charge the Lithium Battery pack, which is a battery management system. The Controller monitors the level of renewable energy power being supplied by the PV panels, and the level of flow in and out of the property. The Controller requires a standard AC supply to plug into, so this must be considered when surveying and installation.

The Controller will prioritise the demands of the property first, then allocate any residual power to the battery management system, filling the batteries of the solar storage system, and the last thing it will do is to export to the grid. Often you will have a combination of these functions going on – power to the house, excess to the battery management system, with residual going to the grid.
The controller has an interface panel which allows you to see the status of the system at any time. There is also an LCD display screen which allows you to access a range of real-time data.

The Lithium Battery Pack is 2 x 48HA 52v batteries in a single cabinet. This battery management system gives a total capacity of 5kw of which 80% can be drawn (you cannot 100% empty a battery) leaving 4kw available. The battery pack has its own inbuilt battery management system which manages the usage, temperature and performance of the batteries to retain the best lifetime performance possible. This battery pack is installed close to the Controller unit and is connected by 2 cables – one for communication and one for transferring the power.  The Lithium Battery Pack will be fully charged in 2 ½ hours by 2 kw of Solar PV power. 

The Sensor clamps on to the AC supply to the property. This then provides the information as to the flow of electricity in and out of the property, allowing the Controller to manage the newly generated DC power. The Sensor is connected vial an RJ45 cable which has a range of up to 25m, so attention is necessary when surveying an installation to ensure that access is possible for the sensor. Attention must be paid to the arrow on the Sensor which indicates the correct position for installation, putting it in the wrong way around will risk reverse information.

Installation:
As with all installations a good survey will help with the efficiency of installation.
The Growatt DC Battery Storage System Controller unit is installed between the PV panels and the inverter. They most likely installation location is close to the inverter, alternatives are possible. Limiting installing long additional runs of DC cable will maintain efficiency of the overall installation.
As shown in the installation manual, the string inputs can go directly into the controller (via MC4 connections) and then new cables are used to take the connection from the controller as it was previously.
The controller requires an AC standard plug supply, and an RJ45 cable needs to run from the controller to the AC supply to the property – these are the main variables for the installation.
The Lithium Battery pack weighs 45kg, so forward thinking to lift it up to its final installation position is sensible.
This is not a complicated installation. A clear survey will minimise the amount of time required. It is a 2 man job to lift the battery pack into place, however all other areas of the installation are achievable by a single installer.

Monitoring the Growatt DC Battery Storage System performance
The Growatt DC Battery Storage Controller Unit has a display on the front. This display will show the status of the Growatt SP2000 Storage System at all times. By following the arrows you can see where any power is moving around the system.
If you have a wireless router in the property you can use a Wifi Dongle which is installed into the controller and will remotely link to an online monitoring platform which will allow full information as to the daily weekly and monthly performance of you energy back up system. If you have I phone then you can access this information through an ‘Phone App’ straight to your phone.

F.A.Q.

Q:Does this work in a power cut?

A: The Growatt SP2000 battery storage system is a means of saving renewable energy from Solar PV panels via a battery management system and creating a solar battery back up. The power is supplied to the battery storage as DC power. ThSP2000 is not an inverter storage battery, it is not inverter integrated. Therefore the rules of G83 still apply to the inverter which means that it will switch off if a power cut is detected. 

Q:Is the system Dual Tracking ( 2 Answers)

A: No, the SP1000 &SP2000 battery management system cannot take renewable energy inputs from uneven inputs such as east and west arrays, or odd numbers of panels on the string inputs. The SP1000 & SP2000 has multiple string input – so if you have 2 strings of 7  etc. all on the same orientation, then the generated renewable energy can be input into the solar battery storage.

A: Yes, the Growatt SP3000 which is new to the market has been designed for both MPPT dual tracking solar PV systems and AC charging.

Q:How much electricity will I save?

A: The SP2000 battery storage system has a gross capacity of 5kw, which is Net 4kw (80% discharge on the lithium battery pack). However the amount of renewable energy you will save depends on 2 important factors. Firstly the amount of PV power you have available – ie is it a 3kw or a 4 kw installation – how much household usage do you have – if you are using a lot of power then you will have less residual power to fill the batteries. The battery storage system has spare power diverted by the battery management system. It therefore depends on how much spare power is generated. There is no fixed answer, but data of other installations can be requested to give examples of savings.

Q:How much power is needed to charge the solar battery storage unit?

A: The Lithium Battery pack will charge in around 2 ½ hours from a supply of 2kw. If the renewable energy supply can provide 2kw of constant power via the battery management system to the battery storage then the batteries can fill quickly. One of the major benefits of Lithium batteries in the solar battery backup system is that it charges quickly.

Downloads:

For all supporting documents please click on the relevant Growatt model below:


Growatt SP1000................ Click Here

Growatt SP1000................ Click Here

Growatt SP1000................ Click Here