7.40 kWh 51.2V LiFePO4 (LFP) StorageDOCK Battery

The Storagedock ES7.4K is a high-capacity 51.2V LiFePO4 battery designed for professional-grade energy storage in demanding residential and commercial environments. Offering 7.40kWh of total energy, this unit features bolted Grade A Prismatic cells and a 10-year warranty, providing a powerful and scalable solution for 48V systems.

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Robust High-Capacity Energy Storage

The Storagedock ES7.4K (51.2V / 144Ah) is engineered for maximum reliability and power density. Built with bolted Grade A LiFePO4 Prismatic cells clamped at 5000N and protected by MICA-based dividers, this battery is designed for extreme durability and thermal stability. With 5.92kWh of usable energy at 80% Depth of Discharge and a rating of 4,000 cycles, it is an ideal choice for high-demand off-grid and backup applications.

Intelligent Monitoring & System Control

Equipped with a 3-page color touch screen, the ES7.4K provides instant on-site access to critical performance metrics. For advanced management, the battery includes a Bluetooth interface for mobile app connectivity (Android and iOS) and CAN-bus communication specifically designed for Victron Energy GX devices. The system continuously records historic parameters and features integrated SOC and SOH communications for precise battery bank management.

Advanced Safety & Industrial Scalability

The ES7.4K features a high-output 150A BMS and an integrated 125A circuit breaker with trip function. To ensure long-term cell health, a 3A active cell balancer works continuously to maintain voltage equilibrium across the pack. For larger infrastructure needs, up to 8 units can be connected in parallel, creating an expansive 59.2kWh energy storage system. The unit is housed in a rugged polymer-coated steel shell with a galvanized steel internal cell pack, suitable for wall or floor mounting.

Key Product Specifications

Battery Type: Grade A LiFePO4 Prismatic Cells (Bolted)
Nominal Voltage: 51.2 VDC
Total Energy Capacity: 7.40 kWh (144 Ah)
Usable Energy: 5.92 kWh (@ 80% DoD)
User Interface: 3-Page Color Touch Screen & Bluetooth App
Communication: CAN-bus (Victron Interface)
Protection: 125A Circuit Breaker (with trip) & 150A BMS
Recommended Inverter: 6kVA
Scalability: Parallel up to 8 Units
Warranty: 10 Years / 4000 Cycles @ 80% DoD

Technical Specifications ES7.4K – 51.2V
Product code	ES7.4K
Battery type	Grade A LiFePO₄ prismatic cells, bolted
Number of internal modules	1
Nominal voltage	51.2 V
Nominal Ah	144 Ah
Total energy capacity	7.40 kWh
Available energy @ 80% DOD	5.92 kWh
Recommended charge current	0.5C
Maximum charge current	100 A
Bulk / Absorption charge voltage	56.2 VDC
Float voltage	56.2 VDC
Sync voltage	Over ruled by BMS ± 55.2 VDC
Recommended discharge current	0.5C
Maximum discharge current	125 A
Protection: Circuit breaker type	125 A with trip
BMS ampere & number	150 A × 1
Recommended inverter size	6 kVA
Maximum parallel of units	8
Parallel ampere per unit: Discharge	125A / 250A / 325A / 400A / 400A / 400A / 400A / 400A
Parallel ampere per unit: Charge	100A / 200A / 250A / 300A / 300A / 300A / 300A / 300A
CAN-bus communication	Yes
Recommended operating temp: Charge	5° – 45°C
Recommended operating temp: Discharge	0° – 50°C
Warranty period	10 Years / 4000 cycles @ 80% DOD
Nett weight	60.4 kg
Dimensions (h x w x d)	670 mm x 495 mm x 180 mm
Recommended cable size	50 mm²
Installation type	Indoors – Wall / floor
Ventilation distance	200 mm
Installation conditions	Dry. Clean. Regulated temperature
Enclosure	Galvanized steel cell pack. Polymer coated steel shell
User interface	3 “page” colour touch screen
Essential accessories	Storagedock 125A cable kit

nolwandle mbalo

14:35 07 Mar 26

Great sales and service delivery from Lee, Quinton, and Madoda. Lee was exceptional, providing clear and detailed explanations throughout the process. Madoda was superb—very accommodating and responsive. Quinton ensured that the online connection was set up and working perfectly. Overall, excellent service.

Tanja

04:56 06 Mar 26

Specialized Solar Systems installed a small system for me six years ago. Their service and support has been outstanding over the years.

Paul Kruger

09:16 08 Oct 25

Dear Jonathan and team,
Thank you very much for your relentless support during and after the failure of the six year old 80/56 battery from a well-known supplier.
Your team had, over more than six months, endless challenges communicating with and soliciting corrective action from the supplier who in the end suggested an outright dangerous solution to rectify defective battery cells.
Thank you for replacing the defective battery with your impressive LV-COMMS stackable battery with superior BMS protection systems, programmed and manufactured here in George.
Congratulations on an effective and ethical team. Well done!
Thank you so much team.
Best regards.
Paul

Rob Blom

10:31 07 Oct 25

I had some small issues in the last couple of days. SSS responded within 10 minutes and remotely solved 1 problem and for the first problem they gave me a possible cause , and i was able to fix it myself (so no engineer needed to come in).
Great support

Frans Nortje

11:01 05 Aug 25

I had my solar system installed three years ago by Specialized Solar Systems, and I’ve been very satisfied with the performance and support ever since. The setup includes 10 solar panels—4 facing north, 4 west, and 2 east—paired with a Freedom Won 10/8 battery and a Victron system. The system has performed excellently.

In hindsight, I could have opted for a larger battery, as there is still surplus solar energy available at sunset. That said, the overall design has proven reliable and efficient. The support and assistance from Specialized Solar Systems have been outstanding, and I would not hesitate to recommend them.

Brett & Adela

16:20 24 Apr 25

SSS are fantastic. They installed my 20 kwa system 3.5 years ago. A couple of small issues in the beginning but they were there to sort out super quick. Very professional team, Dimitri, Gerrie, Lee , Madoda and the rest of the crew were great. Have recommended them to others and everyone is extremely satisfied with there product and service. Thanx guys

Charl Beukes

06:53 02 Jan 25

Really nice shop. Thank you for helping me.

hardy gouws

20:50 13 Dec 24

AJ MD

10:13 05 Dec 24

Great service and professional people. Will recommend them to anyone!

Gawie Malan

15:51 30 Nov 24

Leon Landsberg

09:17 29 Nov 24

Raymond

15:42 28 Nov 24

I had Specialized Solar Systems install a hybrid solar and battery backup system, and I couldn’t be happier with the result. They set up a Victron 5kVA x 2 system, paired with 3 x 5400kWh batteries and 2 MPPTs to support two banks of solar panels. The team was professional, accommodating, and truly went above and beyond throughout the entire process.

Their pricing for high-quality equipment is unbeatable, and their after-sale service is absolutely fantastic. The system has been running flawlessly for 11 months now. I also opted for the 10-year warranty (instead of 5 years), and the peace of mind it brings is worth every cent.

If you’re looking for top-notch solar solutions in the area, look no further—there’s nobody better! Highly recommended!

Noel Oberem

11:17 28 Nov 24

Another year has gone bye and our installation is 2 years old. SSS Did an excellent job installing what is without doubt superior equipment, Victron. I live in Worcester and opted not to use the locals. Got a better job done by a good team. Follow up and service since is without complaint.

Phillip Van Der Merwe

10:33 28 Nov 24

Good aftersale service. Thank you

Koos Griebenouw

10:15 28 Nov 24

Jacques De Villiers

Specialized Solar Systems is a special company. They are not only selling you a solar system, but also have excellent after sales support. My system had a technical issue, which was resolved by them on the same day I reported it. Thank you!

Simon Dyball

15:18 18 Nov 24

Great service, installation was quick and professional.

Dave Barnes

12:27 13 Nov 24

I am very happy with the service. The installation was well managed, the system has worked well, and I am pleased with the results.

Edie Homan

15:33 12 Nov 24

Excellent product, with excellent experienced customer service staff. Always willing to help, advise or be helpful with upgrades. Can highly recommend SSS

Sylvia Gurney

17:16 07 Nov 24

Exceptional!!

Nelis Willers

18:30 04 Nov 24

Terence Atterbury

10:23 01 Nov 24

Highly Professional service & conduct.
After sales service is outstanding.

14:54 30 Oct 24

Jonathan and his team are some of the most professional Solar Installers I have had the pleasure of dealing with. Their knowledge and product options are extensive and complimented by their customer centric solution approach. I found their post installation service great and I can recommended them with confidence.

Mark Harvey

14:50 30 Oct 24

Robert Haarburger

11:35 30 Oct 24

All good

Veronika Reich

10:34 30 Oct 24

We have had no issues over a long period, so there was no need to contact you guys. I do know however if I do contact you with a problem you are always available immediately.

Colin Fair

12:33 21 Oct 24

Incredible product knowledge and professional, friendly staff. Thank you

Jacobus Smit

09:10 11 Sep 24

Very good service from the beginning. Bobby assisted me very professionally in getting the best option. The installation was done quickly and neatly, Lee and his team worked together as one. I am very happy with their service and can highly recommend them.

herman erasmus

08:33 05 Sep 24

I HAD A SYSTEM INSTALLED IN 2017 (42 PANELS 15KVA INVERTER AND 30/24 LITHIUM BATTERY)AND EVER SINCE ALWAYS HAD GOOD SERVICE, LAST YEAR I ADDED A SYSTEM TO THE FARM AND CABIN. (10 PANELS ,5KVA INVERTER SYSTEM)

Francois De Wet

08:50 03 Sep 24

Daniel Roux

07:48 03 Sep 24

Specialized Solar Systems (SSS) is very professional in its services and products. SSS has always provided us with worry-free support/services at the best possible prices. Bobby / Ryan / Lee thank you very much it is appreciated

Charl Möller

15:29 02 Sep 24

We had inverter and battery installed in August 2022. In February 2023 we contracted SSS again for panels and another battery. The service was very good both times and the equipment is working faultlessly. Will gladly recommend SSS to future customers.

Wilhelm Daniel Vermeulen

11:24 02 Sep 24

Product good and service on tops

Pam Ross

09:25 02 Sep 24

Excellent Service at all times !
SSS is the Best !

Paul van Niekerk

08:18 02 Sep 24

Top rated- Professional customer service with attention to detail

rahasya lavoipierre

07:36 02 Sep 24

always helpful and knowledgeable and willing to help
glad to have them as my supplier
keep it up

Andre van Straaten

05:08 28 Aug 24

Excellent service, sorted my Solar charging problem out! Thanks

Marè Collett

18:30 27 Aug 24

Jenny Coetzee

15:30 27 Aug 24

Many of our friends have used your service.
I will gladly recommend your service to the public.

Willem Adrian

13:37 27 Aug 24

The support and advice received from John and team is excellent, and accurate. With a wide spectrum of solar products and self built units, it makes a decision a lot easier.
Well done !

11:32 27 Aug 24

Johan labuschagne

06:37 27 Aug 24

Professional,on time and great service/price.

Johan Vermeulen

07:07 15 Aug 24

Natasha Reznichenko

06:32 27 Jul 24

Gert Fourie

06:56 24 May 24

This business and its people are just in another class. Great service and top-notch after-sales service. Gerrie and Malherbe are real stars.
Your service and kindness is appreciated. Surely an example for many!!

Paul Richard Zwarts

13:08 13 May 24

Very professional experience from initial brief to implementation & follow up. Ray & his team were provided a wonderful service & the the Solar PV System has met our expecations

Guy Rice

06:57 10 May 24

Jonathan and his team are the best!
Thank you for your great support and service.

unmesh.jagtap

00:57 10 May 24

carole lewis

13:31 09 May 24

First class service with a lack of in depth explanation. In time I was able to sort it out in my mind. Dealt with Ryan Gill who proved his dedication both to me and your company. I would have no hesitation in recommending your company to anyone seeking an installation.

P M

09:58 09 May 24

Incredible! I am so glad I chose SSS, totally competent, fantastic support, great communication, from technical to dale, to accounts, to administration.. and what a wonderful intelligent and reliable system.. i could not be happier with my choice.. for them it’s all about the customer.. thank you

Brigitte Behrmann

15:16 23 Apr 24

Have had my system for 3 years now, been a life saver!! Had our first maintenance procedure and solar panel cleaning service today. I love how professional the team are, knowledgeable of their product, friendly and customer orientated. Thanks SS George team and Bobby, another happy customer.

Louis Botha

11:54 27 Mar 24

Bobby and team thank you for your friendly ,efficient and proffesional service. It was such an nice experience dealing with you.
You delivered the system sooner than I expected and it was neatly installed.
I will recommend you to everyone and has already.
Keep up your good work.
Louis Botha

John Coates

09:15 04 Sep 23

I have been dealing with SSS for several years, organized a Solar system from my design with their specialized advice, bought the components at good prices and installed it. It was so good to have their backing as when I did have problems with their equipment, they were very quick to get it replaced without any fuss. Excellent service.

Christopher Horsley

14:54 20 May 23

Specialized Solar Systems installed my home solar system (inverter, battery, solar panels) with the utmost of professionalism and technical competence right from sales to the installation staff. A very happy customer. Thank you. Perhaps an area of improvement could be more effective internal communication between sales and the installation team. Best, Chris Horsley.

Carol Cronje

13:53 17 May 23

Excellent products and exceptional service makes choosing Specialized Solar Systems as our well researched solar service provider four years ago, the best choice that we could have made. Friendly and professional service with our initial installation, an extension to our solar system and all the questions and adjustments over the past years. You guys remain undoubtedly the BEST !!

Everest Dekker

03:59 07 Apr 23

A great end result from a dedicated, professional and very hard working SSS team that didn't leave until our installation in Oudtshoorn was done way past office hours. These guys won't give up no matter how long it takes! Finally we are less dependent on Eskom and what a wonderful feeling and privilege. Thank you Malherbe, Gerrie, Bobby, Madoda, Quinton and Mr. positive (owners, please mention his name in your reply) Just bear in mind that the current demand is very high so keep your expectations realistic regarding installation time frames.

George Jennings

08:51 06 Apr 23

We were referred to Specialized Solar System by a close business colleague. It has been a breeze dealing with Bobby Hodgson and his team. Our installation was very neatly installed and is all up and running very efficiently. Added to this is SSS are Green Card accredited which adds more peace of mind that we have chosen a well established quality Company. Thank you guys!!

Gareth McDonald

09:19 27 Jan 23

SkyNet Solar is proud to be an Associated Partner of SSS. It's an absolute privilege to work with such a knowledgeable and enthusiastic team!!

The ongoing product development and innovation is truly impressive. We have been incredibly impressed with the quality and reliability of the EnergyDock and StorageDock range, as have our customers.

Martin Warnes

13:46 12 Sep 22

The guys at Approved Solar provided a very high quality and professional service They were extremely helpful, providing answers when needed and keeping us up to date. The installation far exceeded my expectations and unlike what is the norm these days the service provided was above and beyond. I would have no hesitation recommending any solution recommened by these guys.

Ben Olivier

09:22 08 Sep 22

I recently had an issue with my Inverter and the team managed to update software to it and fix the problem remotely and in record time

Alda Lambrechts

11:23 10 Aug 22

Thank you to Bobby and the team for excellent work!!!!

Carl Firmin

16:18 28 Jul 22

Excellent workmanship and service. Neat job. Value for money. Good advice on our requirements, after sales follow up and speedy feedback on questions. Thanks Bobby & team! We really happy with our tailored solar system solution.

Sharon de Reuck

09:52 27 Jun 22

What a pleasant experience! Thank you Bobby Hodgson and Team SSS, you are all amazing and what was daunting at first became the best experience and decision to make. Highly recommended.

Miena Bester

07:12 10 Jun 22

Excellent service, great system. Thank you Bobby and team. You are awesome!

Tulz M

20:33 12 Dec 20

I used the Gauteng supplier, Approved Solar Systems, and I truly appreciate the professionalism showed by the team. They consulted on my needs and answered all of my questions. The turn around was really fast. Most importantly they were warm and friendly to deal with. The positive experience was worth every penny. Thanks for an amazing service...it's a lost art these days.

Ronel Pieterse

15:04 05 Nov 20

Professional, knowledgable, on time. I appreciated the attention to detail and answering my endless questions and requests to quote. With so many solar charlatans out there these days; this is one company you can trust!

lukas du preez

07:08 14 Oct 19

I was very satisfied with the professionalism and quality of the service provided by SSS at my home in Welgelegen George, installing a solar system.To put the cherry on top, I was informed by SSS about 2 weeks after the job was finished and paid for, that I have overpaid them by R32000 and that they would refund me! I was not aware of this and they could have kept quiet and I would never have known. This reflects great business ethics and I can really recommend these guys!

Martiens Prinsloo

09:49 20 May 19

I've been investigating a solar solution for our house in Randburg for the past 5 years. From all the interaction I had with various companies SSS is by far the most professional. They are the only company that was willing to do a decent study of our power usage before making a recommendation of what is needed. The level of service I received was world class. The CEO was actually interacting with me directly via phone and e-mail and explaining everything in a way I can understand. Thank you for time Jonathan! You and your team really showed what service is all about. The installation is very neat and I can already see a huge reduction in my grid consumption. No need to stress about load shedding anymore.

Des Muller

08:53 04 Mar 15

I like when people know their stuff and are not too wrapped up in their expertise to spend time with those who are not so knowledgeable to explain things. I had a good experience and liked the calm confidence the staff projects.