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Battery Storage Knowledge Bank

Commercial and Industrial Energy Storage Overview

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Commercial battery applications

The applications of commercical storage are covered in detail on this page.  In summary they are as follows:

Application  
Increased on-site use of solar power / micro-generation Yes if solar installed, better value for systems <= 30kWh which earn 'deemed' export tariff, not 'metered' export tariff.
Reduce peak demand chargers - 'buy cheap, use peak' Avoid TRIAD charges, reduce DUOS charges
Earn grid income e.g. FFR Capacity Market, Firm Frequency Regulation
Overcome grid constraints Yes e.g. trickle charge battery, fast charge EV cards.  Avoid peak demand constraints.
Commercial UPS battery back-up (in a power cut) Yes e.g. for emergency lighting, essential power.
Off-grid Yes, anything is possible with a generator and micro-generation.
Reduce carbon footprint Yes, reduce line losses, alleviate need for further fossil fuel investment by balancing supply and demand, thus reducing peak demand.

 

System components

There are three main system components:

  • battery inverter / charger (rated in kW) - charges and discharges power, converting ac to dc to charge the battery and dc to ac when discharging;
  • battery (rated in kWh) - stores charge;
  • battery management system.

Most of the system cost is attributable to the battery.

Most of the functionality (ability to provide back-up, peak charge avoidance, enablement of solar during a power cut) is attributable to the inverter / charger and the battery management system.

Key design considerations are as follows:

  • functionality;
  • upfront cost per kWh;
  • lifetime cost per kWh;
  • expected life and warranties;
  • safety;
  • sustainability.

Schematic

A system can either be assembled from individual components, combining for example a Samsung battery with an ABB converter (inverter / charger), or it can be purchased as a 'package' in which the battery and inverter / charger are packaged by the manufacturer, often into a single unit (e.g. Tesla Powerpack) or container (e.g. Sungrow-Samsung). 

Most systems are 'ac-coupled' i.e. connected to the ac wiring, either at low voltage or at high voltage. The system may or may not include solar panels:

AC coupled commercial energy storage system.pngBattery chemistries

There are five key chemistries:

  • NCM - lithium nickel cobalt managenese e.g. Panasonic (Tesla), LG Chem, Samsung, Tesvolt;
  • LFP - lithium ferro phosphate e.g. Sony (Sonnenbatterie), Simpli-phi;
  • TPPL - thin plate pure lead (e.g. Northstar);
  • flow - vanadium-redox (e.g. RedT, UET).
  • zinc based: zinc-air, copper zinc (e.g. EOS).

The application dictates the charge / discharge behaviour, generally making one particular chemistry more suitable and / or cost effective than the others. In general the lithium ion chemistries (NCM and LFP) are for faster charge and discharge applications (e.g. grid balancing FFR), whereas flow batteries and zinc based batteries are for slower charge and discharge applications (and tend to be cheaper).

Battery chemistry comparison

The table sets out a comparison of NCM, LFP, flow batteries and zinc-air batteries:

  Lithium nickel (NCM) Lithium ferro phosphate (LFP) Zinc hybrid Vanadium redox
No of life cycles ~ 5,000 life cycles at 80% Depth of discharge

For Simpli-phi:

- at 20% DofD, 46,800 life cycles expected, 40,000 warranted;

- at 80% DofD, 10,000 life cycles expected and warranted;

- at 100% DofD, 5,000 life cycles expected and warranted.

5,000 life cycles at 100% depth of discharge. 10,000 cycles at 100% depth of discharge.
Expected life at 250-300 life cycles per year 15 - 17 years 30 years 15-17 years 30 years
"End-of-life" capacity Typically guaranteed to operate at 60-70% of original capacity after 5,000 life cycles. Typically guaranteed to operate at 70% of original capacity after 10,000 lifecycles. Depends on application Depends on application
Temperature tolerance Optimum operating range 15C to 30C (some can operate between -20C and 50C. Packaged systems typically have in built ventilation. LFP does not require ventilation, cooling or thermal regulation (although inverters / switchgear need some ventilation and may require thermal regulation). Operating temperature of 0C to 45C without HVAC, -30C to 70C with HVAC. Operationg temperature of -40C to 50C.
Safety Very good with correct system choice. Suitable for residential or commercial use. Some hazard in the event of fire / thermal runaway, although good brands have multiple safety mechanisms in place. Invest in quality, and install and operate in accordance with manufacturer instructions. Very good - safest most environmentally benign lithium ion chemistry available - no risk of thermal runaway or fire. Non-flammable aqueous electrolyte has no flashpoint; non hazardous and non-corrosive when shipped. The battery is emissions free, non-flammable, non-explosive and contains no heavy metals.
Very rough cost per MWh USD 360-460. USD 890. USD 200. TBC
Environmental / reputational Child labour can be used to mine cobalt in the Congo – it is not clear whether Samsung is using cobalt from this source. Non-toxic, and non-hazardous recyclable materials. . Non-hazardous. After 25 years the vanadium electrolyte can be reused in a new system.
Brands Samsung, Tesla, Tesvolt, LG Chem Simpli-phi, Sony EOS  RedT, UET

 

Inverter chargers / packaged systems

The main inverter charger manufacturers are as follows:

  • Victron (up to 250kW);
  • SMA;
  • ABB;
  • Northern Power Systems;
  • Sungrow.

In addition there are 'packaged' systems in which the battery and inverter / charger are combined into one solution, usually containerised.  Some of the key players are as follows:

  • Tesla (Powerpack);
  • Samsung - Sungrow ESS;
  • BYD;
  • NEC;
  • EOS-Northern Power Systems.

Funded storage (> 1MW / 1MWh) for high electricity users

We work closely with financiers and are able to offer funded energy storage solutions to high electricity users, meeting these criteria:

  • an import connection sized at 1000kVa plus;
  • minimum base load of 500kW and / or potential for export connection;
  • long-term (10-15 year) intention to utilise premises (and maintain current load), satisfactory credit history.

Effectively the investment fund retains ownership of the battery to use to earn grid income, whilst you benefit from significantly reduced TRIAD charges and DUoS charges, and possibly a commercial UPS battery back-up.  Download our free fact sheet for more information:

Download Funded Battery Storage FactSheet  Funded commercial and industrial energy storage  Download Now