Transcript EV CHARGING STATION

EV CHARGING STATION
JACOB JACKSON, HUSSAIN MOHAMMAD
PROBLEM STATEMENT
• Problem statement…
As two employees at Second Solar, we are asked to build a stand-alone
PV system that can charge an electric vehicle. The following requirements
have to be met:
● The system must operate day/night
● Completely off the grid
● Enough storage for 2 days of autonomy
EV CHARGING STATION APPROACH
• Goal and driving forces
• Evaluation of load
• Inverter and charge controller
• Batteries
• Modules
GOALS AND DRIVING FORCES
• Second Solar hit some hard times, and went through layoffs
• Because of our daredevil nature, we went to work for ZERO Motorcycles
in Santa Cruz, CA. We are opening their AZ branch.
• The objective: design an off-grid PV charging station with 2 days of
autonomy that’s compatible all their models of electric motorcycles
EVALUATION OF LOAD
• 13 kWh capacity
• 1.3kW charger
• 110 or 220 V AC input
• Assume 1 full charge a day
EVALUATION OF LOAD, CONTINUED
• Losses to consider
Inverter efficiency – 92%
Charge controllers efficiency –
97.5%
Battery efficiency – 85%
Depth of discharge limitations
– 80%
Wire Losses – 2%
• Total capacity: ~22.3 kWh
• 2 days of autonomy: 45 kWh total capacity
INVERTER AND CHARGE CONTROLLER
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Not the cheapest
but…
Very reliable
Economy of scale
One provider
Excellent reviews
INVERTE
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Relevant Specs
DC Input Range: 40-64V
AC Output Voltage: 210-250V AC (Selectable)
Continuous AC Output Current: 15.2
Temperature Range: -40 to 60
Charge Controller
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Relevant Specs
Nominal Battery Voltage: 12-60 (Selectable)
Max Current: 80A
PV Open Circuit Voltage: 150V
Temperature Range: -40 to 60
System Specs
Battery DC Input Voltage: 57.6V
Charging Current: ~44 A (22 per charge
controller)
Continuous AC Output Voltage: 220V
Continuous AC Output Current: ~6.5A
Battery Selection
Two choices in battery selection…
● Lead Acid (Golf car Battery)
● Li-ion
Battery Type
Cost
Performance
Safety
Size & Weight
Total
Li-ion
3
9
6
8
26
Lead Acid
9
2
5
2
18
Li-ion is a better choice!
Battery Selection
● Lithium-ion LiFeYPO4
● Made by Wenston
● 3.2 V / 400 Ah
● 57.6 V Output & 14400 Ah
● 2 parallel strings needed of 18 batteries in series
● 5000 Cycles @ 80% DOD
MODULE CALCULATION AND SELECTION
Total system capacity: 45kWh
Phoenix average PSH in the
winter: 5.78
Total System Size: 7.9kW
Module
Selection…
MODULE CALCULATION AND SELECTION,
CONTINUED
TrinaSmart 295W
• Minimum of 26 modules needed
• 32 modules - 8 strings 4 in series
• Trina: Large, reliable, excellent warranty. Not going to go out of business
• TrinaSmart: Built in shade handling, safety, and data logging
Economics
Component
Operating T
Price ($)
Units Needed
Total Cost
Trina Solar
TSM-295-PD14
295W
-40 to 85 C
268.98
32
8607.4
Outback Power
Radian
GS7048E
Export Inverter
-40 to 60 C
4350
1
4350.0
Outback Power
FlexMax FM80
Charge
Controller
-40 to 60 C
520
2
1040.0
GWL/Power
WBLYP400AHA
LiFeYPO4
(3.2V/400Ah)
-40 to 85 C
538.2
36
19375.2
Stand-Alone PV
system
$33,373
Manufacturers & Sellers
Component
Manufacturer
Seller
TrinaSolar
https://www.civicsolar.com/product/trinasolar-tsm-295-pd14-295w-poly-slvwht1000v-solar-panel
Trina Solar TSM-295-PD14 295W
Outback Power Radian GS7048E Export
Inverter
Outback
Outback Power FlexMax 80 Charge
Controller
Outback
GWL/Power WB-LYP400AHA LiFeYPO4
(3.2V/400Ah)
Wenston
http://www.wholesalesolar.com/2550099/
outback-power/inverters/outback-powerradian-gs7048e-export-inverter
http://www.wholesalesolar.com/3510605/
outback-power/chargecontrollers/outback-power-flexmax-fm80charge-controller
https://www.ev-power.eu/Winston-40Ah200Ah/WB-LYP400AHA-LiFeYPO4-32V-400Ah.html
Final Design
Outcomes
Stand alone PV systems are costly
Stand-alone systems can be efficient to power our everyday appliances
For the performance of this system, they’re a must have for ZERO
Motorcycle.