WattGrid Overview and Component specifications

Watt ES series inverter (hybrid Inverter) is bidirectional, which applies to Grid connected PV systems with battery stored energy. Energy produced by the PV system is used to optimize self-consumption; excess energy is used to charge the batteries, and then the batteries supplement the House load when the PV energy is inadequate.

When PV energy output is insufficient to support connected loads, the system automatically gets energy
from the batteries if battery capacity is above 40% SOC. If the battery capacity is insufficient to meet
consumption requirements, electricity will be drawn from the grid.

WattGrid ES Series Inverter has a UPS function (uninterrupted power supply),
so in event of blackout the UPS will support designated backup circuits.

basic_hybrid_PV_system_overview

Figure 1-1 Basic hybrid PV system overview


There are 4 basic work Modes to the system

Mode 1

Energy produced by the PV is preferred by the local loads and excess energy is
used for charging the batteries.

Mode 2

If there is no PV, Batteries will supplement the house load along with the grid.

Mode 3

Grid Failure, When, blackout occurs the UPS function, automatically powers
designated Backup circuits such as Lighting and Fridge circuits.

Mode 4

Time of use customers – Battery supplies energy only in peak hour times ensuring
maximum ROI.

Technical Specifications

Model

GW5048D-ES

GW3648D-ES

Solar

* Max. DC power(W)

5400

4200

Max. DC voltage (V)

580

580

MPPT voltage range (V)

125~550

125~550

Starting voltage (V)

125

125

Max. DC current (A)

15/15

15/15

DC overcurrent protection(A)

20

20

No. of DC connectors

2

2

No. of MPPTs

2(can parallel)

2(can parallel)

DC overvoltage category

Category Ⅱ

DC connector

SUNCLIX / MC4 (Optional)

Battery

Battery Type

Lead-acid or Li-Ion

Lead-acid or Li-Ion

Battery Rated voltage (V)

48

48

MAX Discharge power (W)

4600

4600

Charge current (A)

5-50 A continuous, programmable

5-50 A continuous, programmable

Battery capacity (Ah)

>100-500AH(depending requirement)

>100-500AH(depending requirement)

Charging curve

3-stage adaptive with maintenance

3-stage adaptive with maintenance

Charging voltage

57V

57V

Battery temperature compensation

included(Li-Ion)

included(Li-Ion)

Battery voltage sense

integrated

integrated

Current shunt

integrated

integrated

AC Output Data

Nominal AC power(W)

4600

3600

Max. AC power(W)

4600

3600

Peak power (Back-up)(W)

1.5x Pnom, 10sec

1.5x Pnom, 10sec

Max. AC current(A)

20

16

AC overcurrent protection(A)

30

24

Nominal AC output

50/60Hz; 230Vac

AC output range

45~55Hz/55~65Hz;
180~270Vac

AC output (Back-up)

230Vac ±2%, 50Hz ±0.2%, THD
v<3%(linear load)

THD

<1.5%

Power factor

0.9 leading~0.9 lagging

Grid connection

Single phase

AC overvoltage category

Category Ⅲ

Efficiency

Max. efficiency

97.6%

97.6%

Euro efficiency

97.0%

97.0%

MPPT adaptation efficiency

99.9%

NB It is recommended that total PV power should not exceed 130% of maximum DC power


Safety Specifications

Model

GW5048D-ES

GW3648D-ES

Protection

Residual current monitoring unit

Integrated

Anti-islanding protection

Integrated

DC switch(PV)

Integrated (optional)

AC over current protection

Integrated

Insulation monitoring

Integrated

Certifications & Standards

Grid regulation

VDE4105, VDE 0126-1-1+A1,
G83/2, G59/2, AS4777.2/.3, IEC62109-2

Safety

IEC62109-1&-2, AS3100,
IEC62040-1

EMC

EN61000-6-1, EN61000-6-2,
EN61000-6-3, EN61000-6-4, EN61000-3-11, EN61000-3-12

General Data

Dimensions (WxHxD)

516*440*184mm

516*440*184mm

Weight (kg)

30

30

Mounting

Wall-mounted Bracket

Ambient temperature range

-25~60°C (>45°C derating)

Relative humidity

0~95%

Moisture location category

4K4H

Max. operating altitude

2000m

Protection degree

IP65

Environment category

Outdoor & indoor

External environment pollution degree

Grade1、2、3

Topology

Transformer-less

Standby losses(W)

<8

Cooling

Natural convection

Noise emission(dB)

<25

Display

LED light & APP

Communication

USB2.0 or Wi-Fi

Standard warranty(years)

5/10/15/20/25 (optional)


Battery Technology

Deep cycle gel batteries are a proven technology with over 50 years of testing and improvement.
OPzV Gel batteries are regarded as the most robust and maintenance free, with proven cycle life in isolated regions.

Main Technical Advantages

* Plate: positive plate uses Pz tubular plate which can prevent active material falling, and adopts multi- component alloy frame, has fine corrosion resisting performance and long service life.

* Negative plate uses special radiated structure.

* Separator: uses Amer-Sil, micro-pore PVC- separator from Europe, separator has large porosity and low resistance.

* Electrolyte: From Germany gas silicon dioxide, Sio2 electrolyte in gel state in the battery without flowing, leakage and lamination can be avoided.

* Safety valve: uses Germany technology, constant opening and closing, accumulator case expansion, so damage and electrolyte dry up can be avoided.


Constant Current Discharge (Amperes) at 20 0C (680F )

F.V/Time

10min

15min

30min

1h

2h

3h

5h

8h

10h

1.85V/cell

274

253

206

157

105

81.0

55.5

38.7

32.8

1.80V/cell

337

306

240

176

115

88.1

59.8

41.4

35.0

1.75V/cell

399

343

256

183

119

90.1

61.0

42.1

35.6

1.70V/cell

448

374

271

191

122

91.9

61.9

42.7

36.0

1.65V/cell

481

395

282

196

124

93.6

62.9

43.2

36.3

1.60V/cell

503

409

289

199

126

94.7

63.5

43.5

36.6


Constant Current Discharge (Amperes) at 20 0C (680F )

F.V/Time

10min

15min

30min

1h

2h

3h

5h

8h

10h

1.85V/cell

510

475

394

303

204

158

109

76.7

65.2

1.80V/cell

616

567

455

339

223

171

117

82.0

70.5

1.75V/cell

717

626

480

350

228

174

119

83.2

70.5

1.70V/cell

790

673

503

362

233

177

121

84.1

71.2

1.65V/cell

833

700

518

369

237

180

122

84.9

71.8

1.60V/cell

855

715

526

373

239

181

123

85.3

72.2


Dimensions

image1

image2