AC vs. DC Coupling - AEE Solar...Adara Power (JuiceBox) –since 2013 | San Jose, CA –NMC XanBus...

AC vs. DC

CouplingDesign Considerations

Confidential Property of Schneider Electric

Presented by: Eric Bentsen

Page 2Confidential Property of Schneider Electric |

DC coupling overview


Advantage to using XW charge controllers

Schneider Electric offers two models of Maximum Power Point

Tracking (MPPT) solar charge controllers. The MPPT60-150

provides up to 60A of DC current to the battery, and

accommodates up to 150VDC from the array . The MPPT80-600

provides up to 80A to the battery, and accommodates up to

600VDC array voltage.

Effectively supplying the battery with solar power


DC Coupling with Conext SW-NASimilar to XW+NA, without sell capability


DC coupling off-grid


Grid tie inverters – How they work


Why AC couple in the first place?

• Most already have a PV inverter

• Desire backup

• Better efficiency


Why AC couple in the first place?

• Easy

• Less expensive




• Frequency shift for non-curtailing

• Grid tie inverter must shut down

• Aux port may be used to drive

external AC disconnect relay


• Frequency shift for curtailing

• Grid tie inverter reduces output

• Power continues to flow at load demand


AC coupling with generator?Typically not, unless special application

• Incorporate disconnect

relay

• Relay coil activates by

generator AC

• Limited to equal power ratings

• 60A Pass-Thru limit

• Consider battery charge current


What if I have many PV inverters?Limits of AC coupling


AC coupling off grid?Possible with curtailment

• Off grid designs may spec AC coupling

• Battery regulation not ideal if non-curtailing


AC coupling off gridLoads should equal solar production in real time for greatest efficiency


AC coupling off gridStored energy should support loads during non-solar hours


AC coupling off gridLet’s compare losses

• > load means < efficiency


DC coupling off gridLet’s compare losses

• MPPT80 = 96% efficiency

• MPPT60 = 98% efficiency

• Reliable grid

• New install vs. existing

• Amount of PV

• Size of battery bank


ConsiderationsManaging customer expectations

• Usually multi-unit XW systems

• XW sells to offset grid draw

• Cannot sell to generator

• Similar concept to Multi-Cluster


Designing around 60A pass-thru limitUtilize external transfer switch

• AC or DC coupling multi-clusters

• Community electrification

• Mini-grids


What is possible?Next generation of solar solutions


Conext SW – Off-grid Cabin – Stacked System - CanadaStacked system – 2 x CSW4048

Application: Off-grid

Location: Gander River, Newfoundland, Canada

System: 6kW PV 2x MPPT-60, Stacked 2xCSW 4048

Source: Newfound Energies, Canadian Energy


Conext XW+ – Off-grid Island RetreatStacked system – 18kW

Application: Off-grid with solar and generator

Location: Gambier Island, BC, Canada

System: (3) XW+6848, (4) MPPT80

Source: Eric Smiley, Camp Fircom


Conext XW+NA - AC coupled – San Juan Capistrano, CAStacked system – 3 x XW+NA6848, (2) SMA Sunny Boy 5kW


Conext XW+NA - AC coupled –Irvine, CAStacked system – 9 x XW+NA6848, 39kW micro-inverters, 3200Ah Iron Edison LiFePO4


Conext XW+NA - DC coupled – IIT, ChicagoStacked system – 6 x XW+NA6848,(6) MPPT80


Conext XW- DC coupled – Appledore Island, NHStacked system – (3) 6 x XW+NA6848,(8) MPPT80

Page 29

Key features of battery:

• 8.6kWh or 17.2kWh

• Outdoor/Indoor, wall/floor mounted

• AC & DC coupling

• Auto-setup via XanBus integration

• Peak shift, backup

• Cellular connection and cloud software

• Designed for 2-man install

Contact Info:

• Neil Maguire [email protected]

• www.adarapower.com

Adara Power (JuiceBox) – since 2013 | San Jose, CA – NMC

XanBus integrated residential ESS, plug-n-play commissioning and remote updates

AC-coupled 8.6kWh System – Hawaii CSS Listed

Battery Model AP86

Voltage, Ah 50V, 172Ah

Cycles @ DOD% 4000+

Max # in parallel 2 – units

Warranty 10 – years

Presentation by Schneider Electric |

Page 30


• XanBus Enabled – Plug-n-play

compatible with Schneider Electric

Conext Systems

• Integrated BMS – Dynamically

controlled charging for

reduced charge times and

efficient cell balancing.

• Robust and stable Lithium

chemistry

Contact Info:

• Brendon Sauer,

brendon.sauer@discover-

energy.com

• www.discover-energy.com

Discover Energy – since 1949 | Vancouver, Canada – Li-ion LiFePO4

Broad application and product knowledge with 67 years of lead acid experience.

3 Phase Conext XW+ System with 66.5kWh of energy storage.


Page 31

IronEdison– since 2010 | Lakewood, CO – LFP

Designs custom battery solutions backed by outstanding technical support and years of off-grid

system design experience.


• Included BMS and overcurrent protection

• Remotely monitor battery performance

• Capacities range from 9 to >500 kWh

• Designed and assembled in USA

• Lifetime technical support

• High-capacity single prismatic cells

used for fewer parallel connections

Contact Info:

• Brandon Williams

• [email protected]

Remote telecom site using (2) Conext XW+6848 inverters

Battery Model Lithium Iron

Voltage, Ah

Using 1000Ah

cells

52V, 5000Ah

Cycles @

DOD%

5,000 @ 50%

Max # in parallel 5 – units

Warranty 7 – years


Page 32


• Safety: BMS & integrated 80A Breaker

• 98% Round Trip; 10,000 Cycles

• Operating Temp: -20F to 140F

• No Thermal Runaway - Non Hazardous

• No active thermal management

• PbA Drop-In Replacement

• UL1973: PHI 3.4, PHI 2.6 (IP)

Contact Info:

• Ben Widmer, [email protected]

• For more info: http://simpliphipower.com/

SimpliPhi Power, Inc. - Since 2010 | Ojai, CA - LFP

93.6kWh @ 48V with Qty 3 Conext XW+ and PDPs

Battery Model PHI 2.6 PHI 3.4

Voltage, Ah 51.2,

51.2

51.2, 67

Cycles @

DOD%

10K @ 80% DOD

Max # in

parallel

No Limit

Warranty 10 years


http://simpliphipower.com/

Questions?


[email protected]

sesolar.com

mailto:[email protected]

Date post:	13-Sep-2020
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AC vs. DC Coupling - AEE Solar...Adara Power (JuiceBox) –since 2013 | San Jose, CA –NMC XanBus...

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