Requirement：Battery bank must be 144V, colloid battery  is suggested. Battery’ capacity is decided by system design, The table 1 shows the relationship of energy storage capacity with battery capacity.

Battery type Battery Number(pcs) Energy Storage(kWh)

12V/12Ah 12 1.7

12V/20Ah 12 2.88

12V/38Ah 12 5.47

12V/50Ah 12 7.2

12V/65Ah 12 9.36

12V/100Ah 12 14.4

Table 1PV system design can be 3kW, 4kW, 5kW,solar panel string open voltage should be large than 200V. Table 2 shows the relationship of pv system with inverter.

PV System(kW) 250Wp Solar panel Number(pcs) Inverter model

3 12 S3600TL

4 16 S4400TL

5 20 S5000TL

Table 2

Function：After system installed, customer can set enable or disable if the power storage in the battery be discharge or not in the night time.

If customer can sell power to grid, we suggest disable this function, since this can make battery life long. If no fit, customer can enable this function, so in the night time, system will detect the load consumption, then discharge equivalent power from battery. This function will make battery life short, since battery lifetime is decided by charge/discharge cycles.1. In the daytime

Grid Fit(if power to grid have fit)

Battery full or low

Behavior

Normal Yes Full Both 2 panel string will work on parallel mode, pv power will be depleted by load or inject to grid. Pls refer to note 1

Normal Yes Low 1st string will work on parallel mode, and 2nd string will charge battery, after battery full, 2nd string will also work on parallel mode

Normal No Full Both 2 panel string will work on parallel mode, but it will automatically detect load, then adjust pv power equal load. Pls refer to note 2

Normal No Low 1st panel string will work on parallel mode, but it will automatically detect load, then adjust pv power equal load. 2nd

string will charge battery

Off -- -- System will go to off grid mode to supply load, both 2 panel string will charge battery.

2 In the night time

Grid Fit(if power to grid have fit)

Battery full or low

Behavior

Normal Yes Full No action

Normal Yes Low No action

Normal No Full System will start on parallel mode, discharge power is decided by the load. Pls refer to note 3

Normal No Low No action

Off -- -- System will start to off grid mode to supply load.

Note1: For example, when sunlight is good, pv power is 4kw, load is 3kw, so 1kw power will be sold to grid; if pv power is 4kw, load 5kw, all pv power will be consumed by load.Note2: For example, when sunlight is good, pv power is 4kw, load is 3kw, so 1kw power will be sold to grid, if anti reflux function is enabled the system will automatically decrease pv power to 3kw, make it equal to load. Under this condition, all pv power is consumed by load, no power to grid. If load increase from 3kw to 5kw, the system will automatically increase pv power to 4kw.Note3:For example, load is 1kw, system will discharge battery with 1kw to make load power from battery, and at the same time, no power inject to grid, since system is monitoring load consumption all the time.