Design Type

Brand & Model

Sol-Ark 12K

Tesla  Powerwall2x2

Generac PWRcell 

Enphase Encharge

LG/SolarEdge Energy Hub 

 Low Install Cost

63A 4ms transfer switch for subload panel, All-In-One Hybrid.Load Mgmt. not needed


Entire home transfer switch, All-In-One Hybrid, 8ch load Mgmt

Entire Home transfer switch

3rd Party Load Mgmt

Entire home transfer switch,

Small  Load Mgmt

Entire home transfer switch,

3rd Party Load Mgmt

Peak Current (Off Grid)

higher power=fewer support calls

67A

60A

50A

30A

24.6

On Grid

Continuous PV to AC Power

9kW

15.2kW

7.6kW

7.6kW

10-15kW

On Grid

Continuous PV to AC Power

9kW

10kW

7.6kW

5kW

3.84kW

Hardware Reliability 

20+ year design life, electronics isolated from  environment 

20+ year design life, electronics isolated from  environment 

10yr life
electronics exoosed to
humidity & dust or
clogged filter


20+ year design life,
electronics isolated from
environment

20+ year design life,
electronics isolated from
environment

Charging Battery from Generator 

Yes

No

No

No

No

PV to Battery to AC Efficiency @65%

93%

87.0%

85%

82%

87%

Customer Satisfaction  Rating

Number Of Reviews

133

366

26

26

1

Design Type

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC Transformer-less

AC

Coupled

AC

Coupled

Brand & Model

Sol-Ark 15K

Sol-Ark 12K

Sol-Ark 8K

Sol-Ark 5K

Outback Skybox 2XSBX5048

Generac PWRcell 7.6  +4xS2500

SolarEdge Energy Hub 7.6 32xP400

Panasonic (Darfon) 2xH5001

Enphase  2x10 +36xIQ7P

Tesla 2x Powerwall2 +String Inv

MSRP Price

$8,000

$6,900

$6,100

$4,500

$7,600

$6,500

$7,600

$6,200

$28,700

$19,400

 Solar PV

 Continuous Power

16KW

12KW

9KW

6.5KW

2x5.5KW

11KW

7.6KW

2X6KW

10.4KW

12KW

Inverter AC

Continuous Power

15KW

9KW

8KW

5KW

2x5KW

7.6KW

7.6W

2x5KW

10.4KW

2x5KW

Inverter Battery

Continuous Power

12KW

9KW

8KW

5KW

2x5KW

9KW

6.1KW

2x5.5KW

2x3.8KW

2x5KW

Off Grid Inverter AC (5s)

Peak Power

24KW

16KW

16KW

16KW

10KW

12KW

6.9KW

13KW

8.8KW

14KW

System Idle Power

90W

60W

60W

60W

280W

200W


78W

AC to DC Charger

250A

185A

185A

120A

200A

6.7KW

5KW?

120A

N/A

N/A

User  Interface

Color Touch

Color  Touch

Color  Touch 

Color  Touch 

Color Touch 

Text 

Text 

Text 

X

X

PV to Battery Efficiency @65%

97.5%

97.5%

97.5%

97.5%

81.0%

92.0%

92.5%

91.0%

92.0%

92.5%

AC to Battery Efficiency   @65%

96.0

96.0%

96.0%

96.0%

80%

93.0%

93.5%

90.0%

95.0%

95.0%

Battery to AC Efficiency @65%

95.5

95.5

95.5%

95.5%

94.5%

93.0%

93.5%

90.0%

95.0%

95.0%

On Grid PV to 

AC Efficiency  

@65%

96.5

96.5

96.5

96.5%

94%

95.5%

98.0%

95.5

97.0%

97.0%

Time of Use or Off Grid

PV-Battery-AC 

Losses

@65%

7%

7%

7%

7%

24%

15%

14%

19%

13%

13%

Grid Failure 

UPS Transfer Time

@65%

5ms

4ms

4ms

4ms

20ms

1000ms

3000ms

20ms

2000ms

2000ms

Low Cost Easy Install

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Warranty 

10 Yr

10 Yr

5/10 Yr

5 Yr

5/10 Yr

10 Yr

12/20/25 Yr

10 Yr

10 Yr

10 Yr

AC Coupling 

to Existing Inverters

Yes

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Parallel 

Stacking

Yes

Yes

No

No

Yes

No

Yes

Yes

Yes

Yes

120/240/208v 3Phase

Yes

Yes

No

No

No

Yes

No

No

No

Yes

Generator Charging 

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

AC Load Shedding for TOU % Off Grid

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

No

California  &             HECO              (Grid Sell)

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

Yes

NEC UL1699B Arc Fault

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Yes

Yes

Outdoor Enclosure

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Yes

Yes

Battery

Bank

20KWh 6000cycles +$13K

20KWh 6000cycles +$13K

20KWh +$13K

20KWh +$13K

20KWh +$13K

18KWh 3500c +$13K

2x9.8KWh 3000c +12K

18KWh  3000c +$12K

21.0KWh 6000cycles

28KWh 3500cycles

Design Type

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC Transformer-less

DC

Coupled


DC

Coupled

DC

Coupled

AC

Coupled

AC

Coupled

AC

Coupled

AC

Coupled

Brand & Model

Sol-Ark 12K

Sol-Ark 8K

Sol-Ark 5K

Outback Skybox 2XSBX5048

Generac PWRcell 7.6  +4xS2500

SolarEdge  StorEdge 7.6 32xP400

SolarEdge Energy Hub 7.6 32xP400

Panasonic (Darfon) 2xH5001

Outback Radian     FPR-8048A

Schneider XWPro6.8 +3MPPT80

Victron 2xQuattro5K +3xMPPT150

SMA

11000TL + 2x4548

Enphase  2x10 +36xIQ7P

Sonnen   ECO-20 +String Inv

Tesla 2x Powerwall2 +String Inv

MSRP Price

$6,900

$6,100

$4,500

$7,600

$6,500

$6,900

$7,600

$6,200

$7,200

$9,900

$9,200

$9,800

$28,700

$24,000

$19,400

 Solar PV

 Continuous Power

12KW

9KW

6.5KW

2x5.5KW

11KW

7.6KW

7.6KW

2X6KW

7.7KW

11.6KW

12KW

11KW

10.4KW

12KW

12KW

Inverter AC

Continuous Power

9KW

8KW

5KW

2x5KW

7.6KW

7.6KW

7.6W

2x5KW

8KW

6.8Kw

8KW

11KW

10.4KW

8KW

2x5KW

Inverter Battery

Continuous Power

9KW

8KW

5KW

2x5KW

9KW

5KW

6.1KW

2x5.5KW

8KW

6.8KW

8KW

2x4.5KW

2x3.8KW

8KW

2x5KW

Off Grid Inverter AC (5s)

Peak Power

16KW

16KW

16KW

10KW

12KW

7.6KW

6.9KW

13KW

12KW

12KW

20KW

20KW

8.8KW

12KW

14KW

System Idle Power

60W

60W

60W

280W

200W

76KW

48W

75W

50KW


60W

78W

AC to DC Charger

185A

185A

120A

200A

6.7KW

5KW

5KW?

120A

115A

140A

255A

170A

N/A

115A

N/A

User  Interface

Color  Touch

Color  Touch 

Color  Touch 

Color Touch 

Text 

Text 

Text 

Text 

Text 

Text 

Color  Touch 

Text 

X

Color  Touch 

X

PV to Battery Efficiency @65%

97.5%

97.5%

97.5%

81.0%

92.0%

91.0%

92.5%

91.0%

97.5%

96.0%

97.5

78.0%

92.0%

82.0%

92.5%

AC to Battery Efficiency   @65%

96.0%

96.0%

96.0%

80%

93.0%

91.0%

93.5%

90.0%

85.0%

91.5%

85.0%

80.0%

95.0%

85.0%

95.0%

Battery to AC Efficiency @65%

95.5

95.5%

95.5%

94.5%

93.0%

91.0%

93.5%

90.0%

93.0%

92.5%

91.5%

94.5

95.0%

93.0%

95.0%

On Grid PV to 

AC Efficiency  

@65%

96.5

96.5

96.5%

94%

95.5%

96.5%

98.0%

95.5

90.2%

88.5%

89.2%

98.0%

97.0%

97%

97.0%

Time of Use or Off Grid

PV-Battery-AC 

Losses

@65%

7%

7%

7%

24%

15%

18%

14%

19%

10%

12%

11%

28%

13%

25%

13%

Grid Failure 

UPS Transfer Time

@65%

4ms

4ms

4ms

20ms

1000ms

2000ms

3000ms

20ms

8ms

8ms

20ms

35ms

2000ms

100ms

2000ms

Low Cost Easy Install

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

Yes

Yes

Yes

Yes

Warranty 

10 Yr

5/10 Yr

5 Yr

5/10 Yr

10 Yr

5/10/25 Yr

12/20/25 Yr

10 Yr

5/10 Yr

10 Yr

5 Yr

10 Yr

10 Yr

10 Yr

10 Yr

AC Coupling 

to Existing Inverters

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Parallel 

Stacking

Yes

No

No

Yes

No

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Yes

120/240/208v 

 3Phase

Yes

No

No

No

Yes

No

No

No

No

Yes

Yes

Yes

No

No

Yes

Generator Charging 

Yes

Yes

Yes

Yes

No

No

No

No

Yes

Yes

Yes

Yes

No

Yes

No

AC Load Shedding for TOU % Off Grid

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

Yes

No

No

Yes

No

California  & HECO      (Grid Sell)

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

NEC UL1699B Arc Fault

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Yes

No

No

Yes

Yes

Yes

Yes

Outdoor Enclosure

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

No

Yes

Yes

No

Yes

Battery

Bank

20KWh 6000cycles +$13K

20KWh +$13K

20KWh +$13K

20KWh +$13K

18KWh 3500c +$13K

2x9.8KWh 3000c +$12K

2x9.8KWh 3000c +12K

18KWh  3000c +$12K

20KWh

+$13K

20KWh

+$13K

20KWh +$13K

20KWh +$13K

21.0KWh 6000cycles

20KWh 6000cycles

28KWh 3500cycles

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