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Different types of Batteries

TGR Energy uses two types of batteries for solar electricity storage: Lead-acid (also called gel or AGM) and Lithium-ion (as well as lithium-ion's relatively new cousin, lithium-iron-phosphate) technology. When it comes to selecting the best battery for your needs, TGR Energy will take into consideration a range of aspects. Budget temperature, ambient temperatures, availability of space, patterns of usage and the kind of inverter and solar panel to choose are all crucial aspects to consider when we pair up the battery capacity of your system. Lithium-ion battery systems like Tesla Powerwall are able to tick a few essential boxes when it comes to endurance and performance, however they're still quite expensive and not as well-tested as conventional lead-acid batteries.

Modern lead-acid batteries continue perform quite well in comparison to the latest technologies. They're not just significantly less expensive, but they are also recyclable and boasting a century-long history of reliability. One of the downsides to Gel or Lead-Acid battery storage is that they're only suitable for slow cycling which means that they're continuously charged throughout the day, and then discharged over the whole night. The technology needed for quick and strong drawing are Lithium Ion - this is the reason they are so well-liked within Electric Vehicles.

Another advantage that comes with Lithium Ion battery as compared to Gel or Lead-Acid batteries is the space required to set up the installation. Traditional battery technologies can be discharged up to 40-50 percent of their capacity to be long-lasting enough to provide a decent return. That means you'll require a larger space than Lithium Ion bank, which can be discharged up to 90% and can last 20 years. Lead-Acid or Gel batteries will normally last only 7 to 10 years in a similar situation. Another crucial concept TGR Energy would like to explain to you will be Depth of Discharge (DoD) percent that is commonly associated with batteries.

To maximize cycle longevity (the quantity of recharge or discharge cycles in the lifetime of the battery) it is recommended that the battery not be discharged beyond around 80 percent of its capacity. This could be referred to as the 80% DoD. The exact number will vary based on the manufacturer and the chemical composition of the battery. DoD defines the extent of a battery being empty in relation to its total capacity. For instance, if have a battery bank that has the capacity of 10 kilowatts (kWh) and you are at 80percent DoD it will have only 3kWh remaining. This implies that a battery storage unit should be properly sized to optimize your system's efficiency and effectiveness as well as cost-effectiveness. TGR Energy has a team of highly skilled engineers who are available to assist you in the process of selecting the best batteries backup solution.

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Battery Comparison
Lithium-ion (and lithium-iron-phosphate)
Performance & Efficiency
  • Medium efficiency: a typical lead acid battery will provide 75-80 per cent of energy used during charging
  • A medium tolerance of deep discharge (DoD)
  • It is most effective when it is in a clean charge/discharge cycle Take energy slowly before charging back with a steady pace
  • High efficiency - A typical lithium-ion battery will provide 95 percent of the energy used when charging
  • A higher tolerance to deep discharging (DoD)
  • The ability to increase power and supply large amounts of power fast (this is what makes them extremely popular in Electric Vehicles)
It can last for more than 10 years in a clean charging and discharge regime
  • Long-lasting (measured in the charge/discharge cycles)
  • Can be discharged more frequently without compromising capacity
Proven, mature technology
Lower risk of explosions in gas because there isn't any hydrogen production
No safety rules for freight which means less hurdles to overcome in importing
The importer must comply with the restrictions on freight when they are
Recyclable and easily
There is no standardised recycling programme yet
There is no standardised recycling programme yet
High tolerance to temperatures up to 105°C.
Contemporary Gel as well as AGM are maintenance-free (no refilling with acid or water)
No Maintenance
Very Standard
There is no standardization of installation and usage (at this point) This means that batteries have to be carefully in conjunction to chargers and inverters
Cheap, but not Cheap.
Costs for upfront expenses that are higher

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