Medium Residential Grid-Interactive Hybrid Solar System 5kVA 12kWhrs per day

This complete Grid-Interactive Hybrid Solar System has been specially designed by Specialized Solar Systems. The solar system will reliably supply our customers with a daily average of 12kWhs of solar-generated electrical energy per day from the solar panel array.


Residential Complete Grid-Interactive Hybrid Solar System 5KV 12kWhr per day 

This complete Grid-Interactive Hybrid Solar System has been specially designed by Specialized Solar Systems. The solar system will reliably supply our customers with a daily average of 12kWhs of solar-generated electrical energy per day from the solar panel array.

A Grid-Interactive hybrid solar system intelligently gives you the best of both worlds with the added convenience of a grid-connected system including the ability to earn Feed-In-Tariff Credits (if your municipality allows) and the added security of a battery backup.  This means that you should always have electricity, even during power outages, during bad patches of weather,  or if your energy demand exceeds your solar systems energy delivery capacity. For more information about Residential Complete Grid-Interactive Hybrid Solar System please view over here

The Complete Grid-Interactive Hybrid Solar System 5KV 12kWhr per day includes the following equipment:

  • 2250Watt Solar Modules array – 10 Year manufacturer guarantee, 25 years 80% yield.
  • 1 x 85Amp MPPT-TR (Maximum Power Point Tracker) – 5 Year Manufacturer Guarantee.
  • 1 x 5KV 24V 120 Victron Multiplus Inverter/Charger – 5 Year Manufacturer Guarantee.
  • 530Amp hour 2V Cells with take-off leads, battery floats, log book, distilled water in 20L drums, interconnecting cables and hydrometer – 1Year Guarantee, 10-15Year Lifespan
  • 1 x Victron Blue Power Venus GX – 5 Year Manufacturer Guarantee.
  • System installation, programming and maintenance/owner Training – 1 Year Workmanship Guarantee – please inquire about these options.
  • Availability: The system can installed and delivered anywhere in Southern Africa – please enquire.
  • Delivery of products: 4 to 8 weeks from 50% deposit  – please enquire.
  • Terms and Conditions Apply – please enquire.

Please note: When requesting a quote or if you require expert help with choosing the correct Hybrid Solar System from Specialized Solar Systems, customers should please include the location where you plan to install your Hybrid Solar Energy System.

Grid-Interactive Hybrid Solar System 5KV 12kWhr per day solar system details:

Battery Storage Capacity

530Amp 2V Flooded Lead Acid Cells. Based on primary usage being consumed during the day these units will have the capacity in storage to support 3-4kWhrs per night and/or when Mains is unavailable to run approximately 9kWhrs before Eskom comes back online again.

Please note that this figure excludes the power being generated and supplied directly to loads from the solar modules during the day when Mains is offline. This will increase the amount of power in reserve when Mains fails.

 Solar Module Array to Supply

To achieve an average energy input solar generation of 12kWh/day with PV solar modules in George, Western Cape South Africa,  Specialized Solar Systems recommends a PV solar module array capacity of 2250Watt, at a fixed tilt angle of 34°.  Specialized Solar Systems PV solar modules have a 10-year manufacturer’s product guarantee and a terrestrial 25 year 80% yield.

Solar yield is determined by your location, PV solar panel orientation, PV solar panel shading, the PV solar panel surface condition, system usage, weather conditions,  and use at a 34° Tilt Angle Facing North with full day exposure to the sun i.e. no shading.


Solar Charge Controller – MPPT (Maximum Power Point Tracking)

PV voltage up to 150 V

  • The Blue Solar MPPT 150/70 and 150/85 charge controllers will charge a lower nominal-voltage battery from a higher nominal voltage PV array.
  • The controller will automatically adjust to a 12, 24, 36, or 48 V nominal battery voltage.

Ultra-fast Maximum Power Point Tracking (MPPT)

  • Especially in case of a clouded sky, when light intensity is changing continuously, an ultra-fast MPPT controller will improve energy harvest by up to 30% compared to PWM charge controllers and by up to 10% compared to slower MPPT controllers.

Advanced Maximum Power Point Detection in case of partial shading conditions

  • If partial shading occurs, two or more maximum power points may be present on the power-voltage curve.
  • Conventional MPPT’s tend to lock to a local MPP, which may not be the optimum MPP.
  • The innovative Blue Solar algorithm will always maximize energy harvest by locking to the optimum MPP.

Outstanding conversion efficiency

  • Maximum efficiency exceeds 98%. Full output current up to 40°C (104°F).

Flexible charge algorithm

  • Several preconfigured algorithms.
  • One user programmable algorithm. Manual or automatic equalization. Battery temperature sensor. Battery voltage sense option.

Programmable auxiliary relay

  • For alarm or generator start purposes

Extensive electronic protection

  • Over-temperature protection and power derating when the temperature is high.
  • PV short circuit and PV reverse polarity protection.
  • Reverse current protection.

CAN bus

  • To parallel up to 25 units, to connect to a Color Control panel or to connect to a CAN bus network
  • PV short circuit and PV reverse polarity protection. Reverse current protection.

 Pure Sine Wave Bi-Directional Inverter/Charger

1 x 5000/24/120 Victron Multiplus Inverter/Charger

  • Continuous output power at 25’C (VA) per unit 5000
  • Continuous output power at 25’C (W) per unit   4500
  • Continuous output power at 40’C (W) per unit   4000
  • Peak Power (W) per unit  10 000

 Multi-functional, with intelligent power management

  • The Multiplus is a powerful true sine wave inverter, a sophisticated battery charger that features adaptive charge technology, and a high-speed AC transfer switch in a single compact enclosure. Next, to these primary functions, the Multiplus has several advanced features, as outlined below.

 Two AC Outputs

  • The main output has no-break functionality. The Multiplus takes over the supply to the connected loads in the event of a grid failure or when shore/generator power is disconnected. This happens so fast (less than 20 milliseconds) that computers and other electronic equipment will continue to operate without disruption. The second output is live only when AC is available on one of the inputs of the Multiplus. Loads that should not discharge the battery, like a water heater, for example, can be connected to this output (second output available on models with 50A transfer switch only).

 Virtually unlimited power thanks to parallel operation

  • Up to 6 Multi’s can operate in parallel to achieve higher power output. Six 24/5000/120 units, for example, will provide 25 kW / 30 kVA output power with 720 Amps charging capacity.

 Three phase capability

  • In addition to parallel connection, three units of the same model can be configured for three-phase output. But that’s not all: up to 6 sets of three units can be parallel connected for a huge 75 kW / 90 kVA inverter and more than 2000 Amps charging capacity.

 Power Control – Dealing with a limited generator, shore side or grid power

  • The Multi Plus is a very powerful battery charger. It will, therefore, draw a lot of current from the generator or shore side supply (nearly 10A per 5kVA Multi at 230VAC). With the Multi Control Panel, a maximum generator or shore current can be set. The Multi Plus will then take account of other AC loads and use whatever is extra for charging, thus preventing the generator or shore supply from being overloaded.

 Power Assist – Boosting the capacity of shore or generator power

  • This feature takes the principle of Power Control to a further dimension. It allows the Multi Plus to supplement the capacity of the alternative source. Where peak power is so often required only for a limited period, the Multi Plus will make sure that insufficient shore or generator power is immediately compensated for by power from the battery. When the load reduces, the spare power is used to recharge the battery.

 Four stage adaptive charger and dual bank battery charging

  • The main output provides a powerful charge to the battery system by means of advanced ‘adaptive charge’ software. The software fine-tunes the three-stage automatic process to suit the condition of the battery and adds a fourth-stage for long periods of float charging. The adaptive charge process is described in more detail on the Phoenix Charger datasheet and on our website, under Technical Information. In addition to this, the Multi Plus will charge the second battery using an independent trickle charge output intended for the main engine or generator starter battery (trickle charge output available on 12V and 24V models only).


The Venus GX

  • Provides intuitive control and monitoring for all Victron power systems. The list of Victron products that can be connected is endless: Inverters, Multis, Quattros, MPPT solar chargers, BMV battery monitors, Lynx Ion with Shunt and more.

VRM Online Portal

  • All readings are forwarded to our free remote monitoring website: the VRM Online Portal.

Remote Console on VRM

  • The way to access the device for setting up, as well as monitoring, is via Remote Console. Either via VRM, via the built-in WiFi Access Point, or on the local LAN/WiFi network.

Automatic Genset start/stop

  • A highly customizable start/stop system. Use state of charge, voltage, load and other parameters. Define a special set of rules for quiet times, and optionally a monthly test run.

The heart of ESS –Energy Storage System

  • The Venus GX is the Energy Manager in an ESS system.

Data logging

  • When connected to the internet, all data is sent to the VRM Portal. When there is no internet connection available, the Venus GX will store the data internally, up to 48 hours. By inserting a micro SD-card or USB stick, more data can be stored. These files can then be uploaded to the VRM Portal, or offline converted with the Victron Connect app, for analysis.



  • All Pictures shown are for illustration purpose only. Actual product may vary due to product type and enhancements.
  • Errors and omissions excepted (E&OE)
  • Please inquire about Specialized Solar Systems T & C’s



Advantages of LiFePO4 Batteries

Optimise your Stationary Power by using LiFePO4

Lithium Iron Phosphate (LiFePO4) – No one can afford to be outside of this revolution!

It is not a case of LiFePO4 being affordable, it is a case of can one afford to use lead acid? The life cycle cost of LiFePO4 batteries is a quarter of lead acid batteries. The upfront costs for a pack vary from similar to 50% more for lithium depending on the application, but one must consider that in 3 to 6 years’ time the lead-acid batteries must be replaced and the LiFePO4 battery will last 15 to 20 years depending on the application.

LiFePO4 technology has revolutionised the potential and life cycle cost of operating battery-based power systems. LiFePO4 has a cycle life 10 times that of typical deep cycle lead-acid batteries. They only cost 10-50% more to purchase upfront (depending on size), however, the saving on life-cycle cost is massive.

LiFePO4 batteries from Freedom Won are available in a wide range of sizes to accommodate loads of a few amps to over 2000 amps. They can deliver sustained high power without excessive heat generation. There are no gases released and LiFePO4 cells are also thermally stable. They can be charged repeatedly to full capacity in less than 60 minutes with no appreciable loss in performance.

Backup and Off Grid Battery Packs Using Superior Lithium Iron Phosphate (LiFePO4) Cells – the next Generation of Energy Storage

By: Antony J English, Co-founder of Freedom Won Pty Ltd

Lithium Iron Phosphate cells,  or LiFePO4 for short,  are now dominating the alternate energy storage sphere amongst the more discerning designers and customers in the more advanced markets including Europe, Australia and South Africa.

Freedom Won has been using these cells in electric vehicles since 2010 and in stationary storage since 2014.

Freedom Won provides competitive prices made possible by high volume manufacturing in South Africa and guarantees market leading technical backup and design assistance. Freedom Won has the market leading battery warranty of 10 years with no fine print or diminishing value spurred by our confidence gained from our own test programme in electric vehicles, which is far more demanding on the batteries than stationary power systems. The expected life in off grid systems is more than 15 years, and more than 20 years in grid connected back up installations with occasional cycling. The end of life is defined by when the cells contain 60% of their Beginning of Life (BoL) capacity. The capacity deterioration over time is linear (the deterioration does not become substantially more rapid with extended use), and the cells could therefore be used for even longer periods if a lower end of life capacity is acceptable.

The initial cost of installing a LiFePO4 system as compared to Lead batteries is only marginally higher since the 2018 price decreases in the Freedom Won range. For smaller batteries up to 10kWh this premium is about 40% but for batteries larger than 100kWh this premium is only about 10%.

These premiums in initial cost are dramatically overshadowed by the savings in the total life cycle cost, calculated as a cost per kWh delivered by the battery pack during its lifetime. The lifetime cost per kWh can be as low as 25% of the cost of typical lead acid deep cycle batteries. The main reason for this is that the cells offer up to 10 times the number of cycles than your average deep cycle lead battery and as much as 5 times that of the more robust single cell flooded lead acid types.

Another top benefit to the customer is the far greater efficiency of the LiFePO4 technology, which is typically better than 98%. A typical efficiency for lead batteries is 65%, although this can be as low as 55% in a house PV system where the Depth of Discharge (DoD) is limited to 20% as a measure to lengthen the life of the lead acid cells. In a grid connected back up scenario this high efficiency results in significant energy savings when recharging the batteries, and in a Photo Voltaic (PV) installation it enables a reduction of the size of the array by as much as 30% with the same usable energy.

The advantages of LiFePO4 cells over lead cells are extensive so a full elaboration is not included in this article. A summary is however provided in the table below, and further questions posed to Freedom Won will be welcomed.

Table: Summary of Benefits of Using LiFePO4 Cells in Stationary Power Applications

Comparison Aspect Lead Acid LiFePO4
Cycle Life (50% DoD with 70% remaining capacity, 30 deg C ambient temperature) 500 to 1300 cycles depending on manufacturer and model More than 7000 cycles
Calendar Life Average (poor in high temperature or partial/full discharge condition or infrequent cycling) Excellent – no sulphation, partial charge storage is no problem, regular cycling is not required, heat tolerant
Charge – discharge (round trip) efficiency [%] 60-70% typical depending on current. Typically rated capacity is based on 10 hour discharge (C10) 96%, consistent throughout current range. Rated capacity is based on 20 minute discharge (3C), a one hour or longer discharge will actually give 10% more than the rated capacity.
Temperature resilience Poor – temperatures above 25 deg C significantly reduce the calendar life Excellent – ambient temperatures up to 45 deg C will not affect the life of the cell at all.
Up Front Cost Cheaper 10 to 50% more expensive up front than Lead Acid depending on what lead acid cells are used for comparison and the size of the battery – the Lithium premium on a larger Freedom Lite battery is lower.
Life Cycle Cost per kWh R3.00 (USD0,21) to R6 (USD0,41) depending on battery type and model R1,20 (USD0,08) (approx.)
Quick Charge Time Typically should not be done in less than 5 hours 2 hour standard, 45 min quick
Discharge Current Higher discharge than C10 (10 hours), or 0.1xC rating causes substantial loss in efficiency and affects life C1 (one hour discharge) is standard, higher currents are also acceptable up to 3C (3 x Ah rating) continuous with negligible loss in efficiency and cell life
Gravimetric Energy Density Poor Weigh 3 to 4 times less – reduced transport costs and installation effort.Volumetric density more than 2 times higher – less than half the space required
Pack Capacity Loss of 30% in heat (70% pack efficiency) means pack must be larger to meet a specific output objectiveMax practical DoD is 50%, which requires a larger pack to stay above this DoD to prevent rapid life deterioration Pack can be sized to 50% of the “rated” capacity of a lead acid pack because of 98% efficiency and ability to discharge on regular occasion to 90% DoD with negligible effect on life reduction
Charging Energy Source Size The charging energy source must provide an additional 30 to 40% energy to overcome the inefficiency of the pack at substantial cost Only about 2% of the energy is lost to heat – big savings in charging energy and capital on PV installations etc

When sizing a LiFePO4 pack, the rating of the cells cannot be compared to a typical lead acid rating without making some adjustments. Owing to the much higher efficiency and the ability to discharge more deeply without rapid capacity deterioration over time means that a LiFePO4 can be sized to about 50% of the lead battery in terms of Ampere hours. This factor originates simply from the fact that only 65% of the rated total energy is available from a lead acid battery in most high power backup applications, whilst 100% of the rated energy is available from LiFePO4 cells.

Because it is practical to use a lower DoD in LiFePO4 cells and still achieve an excellent cycle life the designer can reduce the LiFePO4 pack size and still provide superior performance over a lead battery pack. A typical scenario could be 50% DoD for a lead acid pack compared to 70% DoD for a LiFePO4 pack. This ultimately makes the LiFEPO4 pack energy capacity (kWh) rating 50% of the lead acid rating.

LiFePO4 cells maintain their rated nominal voltage for about 95% of the discharge, whilst a lead cell voltage drops continuously. When working out the Wh of a lead 12V battery one must use about 11.4V for the average voltage under load (1,9V per cell). The nominal voltage for LiFePO4 is 3.2V per cell or 52V for a typical “48V” system.

An example comparing a 200Ah LiFePO4 pack to a 400Ah lead pack is included in the below table. The theoretical energy capacity for the lead battery is reduced to 85% of the rated capacity to replicate a real world discharge scenario vs the manufacturer’s 10 hour constant current test regime used for the nameplate Ah rating. The usable capacities are adjusted to be in line with the typical DoD expected in the design of 50% and 70% for the lead and lithium examples respectively.  The LiFePO4 pack costs only 40% more than the Lead battery, however, after taking into account the cycle life and the kWh produced in the lifetime of the packs it is clear that LiFePO4 costs only 22% of the Lead batteries used in this example.

Table: Comparison Example of Lead Battery vs. LiFePO4

Lead Acid   LiFePO4
8 200Ah Lead Acid/Gel 16  units of Sinopoly SP-LFP200AHA (Freedom Lite 20/14)
4 Batteries (units) in Series 16 cells in each string
2 Strings 1 Strings
200 Ah Nameplate Capacity 200 Ah Cell Nameplate Capacity
200 Ah each @ 10hr rate 220 Ah at 3 hour rate (one cell per unit)
12 V per battery nameplate 3,4 V per cell nameplate
11,4 V per battery during discharge 3,2 V per cell during discharge
400 Ah total pack 220 Ah total pack
48 V rated total 54 V rated total
45,6 V nom of pack during discharge 51,2 V nom of pack during discharge
18240 Wh @ 10 hr discharge (260AhX44V) 11264 Wh available and rated for 100% DOD
85% Derating of 10hr Capacity 100% No derating required
15504 Wh available for 100% DOD 11264 Wh available and rated for 100% DOD
7752 Wh available for 50% DOD 7885 Wh available for 70% DOD
50% Percent of LiFePO4 pack rated capacity required to match Lead Acid