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Peak shaving utilizing batteries in commercial and retail properties
by Ian Burger, SOLA Future Energy
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[1] G.H. Muller and C.F. Landy: "Lithium Ion Battery costs and market", Bloomberg new energy finance, July 2017
Decrease in Lithium-ion Batteries
and increasing tariffs
0%
5%
10%
15%
20%
25%
30%
35%
R-
R100.00
R200.00
R300.00
R400.00
R500.00
R600.00
R700.00
2007 2009 2011 2013 2015 2017 2019 2021 2023 2025 2027 2029
Tariff Increase Demand 2017
0
200
400
600
800
1000
1200
Total Load PV Provided Grid (Grid & PV)
New peak Old peak
Demand savings – Ideal case
Demand savings – Retail with
wider load profiles
New peakOld peak
Impact of batteries on demand saving
48% reduction in battery storage capacity when coupled with PV
Full month load, incomer and
battery contribution
Current Jul 2018 Jul 2019 Jul 2020
Input
Batteries (R/kWh) R3 735 R4 047 R4 414 R4 796Inverters (R/kWp) R1 200 R1 200 R1 200 R1 200Control and BoS (Fixed) R990 000 R990 000 R990 000 R990 000CoCT LPU MV Energy (c/kWh) 72,4c 81,8c 92,5c 104,5cCoCT LPU MV Demand (R/kVA) R204,70 R231,31 R261,38 R295,36O&M R18 000 R19 080 R20 225 R21 438
OutputInverter size (kVA) 150 150 150 150Battery capacity (kWh) 300 300 300 300IRR (%) 16% 18,5% 21,3% 24,4%
Model parameters
Impact of reducing battery price and increase tariff on IRR
Optimisation curves for inverter
size and battery capacity
0.00%2.00%4.00%6.00%8.00%
10.00%12.00%14.00%16.00%18.00%20.00%
50 100 150 200 250 300 350 400 450
IRR
Inverter Size (kVa)
0.00%
2.00%
4.00%
6.00%
8.00%
10.00%
12.00%
14.00%
16.00%
18.00%
20.00%
300 350 400 450 500 550 600 650 700 750 800 850 900 950
IRR
Storage Size (kWh)50 kVa 100 kVa 150 kVa
Conclusion
• Ancillary services:• frequency regulation;
• voltage support
• reactive power correction
• Adding stability to the grid, the hybrid PV battery systems
should incentivize the regulator to encourage more of these
systems to the grid.
• Battery system retrofitted or installed as hybrid with new PV
plants
• Demand saving guarantee rather than risk
• Hybrid PV battery systems will be essential part of future
energy mix
www.solafuture.co.za |[email protected]
SOLA FUTURE ENERGY
@solafuture
@solafuture
facebook.com/solafuture
Ian Burger: [email protected]
