What to Know about batteries for grid or off grid solar power.

Battery Storage, Things you need to know.

The first step to understanding a traditional battery energy system using Tubular Gel, Flooded or similar is to look at the way a system is put together.
Watch out helpful Youtube video for visual understanding: https://youtu.be/ZsARidBjgHs 

A battery storage system consists of 6 main elements

  • Solar Panels
  • Solar Charge Controller
  • Direct Current -DC to Alternating Current-AC Inverter
  • Batteries Sealed lead acid-Tubular Gel or similar
  • Battery Charging.
  • Battery Cabinet with the balance of battery system inside.

Solar Panels:
Solar panels are the main source of renewable energy and converts sunlight into usable DC power.

Solar Charge controller:

The solar charge controller then takes the DC and regulates the voltage so that it can safely and efficiently charge the batteries. 

Standard solar charge controllers and battery storage systems operate at nominal 48volts


The DC to AC inverter converts the 48 volts DC from the batteries, and inverts it into 230 volts single Phase or 380 Volts three phase AC which is used to power all the devices in most commercial premises or your home


The Batteries are the core of an energy storage system, and are essential to store the electrical energy for use when needed. 

Most modern battery systems use 2 volt batteries connected in series 24 in total to create the nominal operating voltage of 48 Volts

C rating:

Each 2 volt battery will have specified discharge rate known as the “C” Rating.

The “C” rating of a battery determines how much energy each battery has available over a given period.

“C10” rating means the battery is designed to discharge all of its energy in only 10 hours.

a “C100” rating means the battery is designed to discharge all of its energy in 100 hours,

Most modern sites should be calculated at the “C10” it is generally expected that the energy will be available over this period, commercial communications sites or UPS units will have slightly different C rating needs.

Amp hours:

Amp hours is the amount of energy a battery has at a certain discharge rate, let use a “C10” rating.  48 volts multiplied by the amp hours of the batteries equals the stored capacity in watt hours over a 10 hour period.  2 volts x 1000 amp hours equals 2000 Watt hours.  This means this battery system can deliver 2 kilowatt hours in 10 hours until it is completely discharged, remembering we need 24 batteries to achieve 48 volt nominal operating voltage so in total we would have 48Kwh if fully discharged.

Depth of Discharge DOD:

The Depth of Discharge (DOD) of a battery is the percentage of energy which is allowable when calculating the life of the battery the greater the DOD the shorter the life of a battery..

 Most battery manufacturers recommend a daily DOD of 30% and no greater than 50% to get a reasonable service life from your batteries the amount of DOD determines the cycles.

Battery Cycles:

The amount of cycles a battery has is used to determine the estimated life of a battery.  A complete cycle consists of charge-discharge-charge this is not full discharge and recharge this is partial discharge and recharge constitutes one cycle.  Typical cycle life of a quality battery is 5,000 to 6,000 cycles if you were to partially discharge and charge the battery 3 times each day on average this would allow for 2,000 days divided by 365 days each year gives the expected life of the batteries as 5.47 years.

Battery Temperature

Charge and discharge inside the cells of a battery are affected by temperature. A higher temperature will allow for a more rapid discharge but a significant reduction in expected battery life, generally batteries nominated operating temperature is 25 Degrees.

Battery Charging:

Battery Charging, typical gel batteries or more traditional batteries used in off grid power solutions take 8 hours to charge to 80% and a further 8 hours to reach full state of charge, as result batteries need a regular super boost to get them to 100% state of charge if this isn’t achieved the battery life will also be reduced and may not be covered under warranty.

Cabinet or Housing:

Each battery and its location and its placement inside or outside will determine the cabinet design, no matter what the technology, batteries should be protected from the elements, good clean, dry, moderate temperature with good cross flow ventilation, in some cases a small fan may be needed inside

Calculator (enter your quartery kWh usage)

Calculator (enter quarterly bill amount)

This is averaging out you Peak and off peak at $0.15 pr kW. With 6 hours of sunlight each day

Solar Panels & Tesla

As Solar Power Brisbane specialists in solar power, whether its grid connect or off grid power system design, we service a national client base with world leading solar panels, inverters and Tesla batteries and Powerwall. Solar power installed nationally for residential and commercial sites.
 We provide German inverters and Solar panels, we design and install solar specific to your needs.
The products we use are exactly what we offer on our commercial solar installations.
We also offer the latest solar technology in the form of micro inverters and solar optimisers designed to increase solar panel performance by as much as 17%.
We have recently included Solaredge to our commercial installations with great success and now offer these systems to solar power Brisbane residential homes.

Tesla Batteries & Powerwall

Batteries - Off Grid Power

We can install both off grid and stand alone solar power battery units for domestic and commercial purposes, off grid power solutions using the best design practice and tier one products nationally.
Stand alone batteries and stand alone solar systems are now making ground in the market and removing the need to be grid connected. Whether your are in a remote area, building a new home and would like to consider your power options we have systems to meet all stand alone power needs for residential or commercial.
To find out more about how our battery units can be fitted directly to your current solar power system for little effort and cost, please visit our Off Grid Solar Power Units page. For new solar power systems, and full details on stand alone battery units please visit our Group Partner's page.

Off Grid Solar Units

Poultry Lighting & Power Factor

LED Lighting, Voltage Optimisation and Power Factor correction will significantly reduce operational costs, our observations have seen most sites running a Power factor of .72 to .88 which will see an increase of operating costs between 12% to 30% on most sites, our Voltage optimisation units, LED lights with built in sunrise sunset controllers coupled with our variable speed drives that operate the fans reduce power factor. VSDs will help stabilise the growing condition and improve returns, fans don't have to run at 1005 to get the best results through 80% of the growing cycle, if we reduce fans speed by 25 we increase savings by 20%.
Chicken farms are at the mercy of the energy providers and retailers, better energy supply and a controlled voltage equals better returns, less light failure, less burnt out or failing fans, less heat, and better overall growing conditions.

Chicken Shed Lighting Lighting Plans LED Lights

About Energy Wise Group

Energy Wise Group are Solar Power Brisbane specialists with a national installation and distribution group, operating out of the  Brisbane Technology Park (head office) Eight Mile Plains we offer energy specialists certified and recognised as system designers and integrators of not only solar power Brisbane, but also in energy reduction and integration, solar power Brisbane, voltage optimisation Brisbane, power factor correction and variable speed drives is just part of what we offer, experienced advice and installations for everything solar and energy. We use only the highest quality solar panels and electrical equipment, we will not install based on price alone.
This is truly a family business built on the back of quality service and products. we make no apologies for not being the cheapest in the market, we simply don't offer products or service that don't meet our expectations to many companies make this mistake and wont be around when they are needed.

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