7
8
3.3 Solar Charger connection
3.3.1Battery connection
User can choose proper capacity lead acid battery with a nominal voltage at 48V.
CAUTION: For safety operation and regulation compliance, it's requested to install a
separate DC over-current protector or disconnect device between battery and Solar
Charger 3500. It may not be requested to have a disconnect device in some applic-
ations, however, it's still requested to have over-current protection installed.
WARNING! All wiring must be performed by a qualified personnel.
WARNING! It's very important for system safety and efficient operation to use
appropriate cable for battery connection. To reduce risk of injury, please use the
proper recommended cable and terminal size as below.
Ring terminal:
Figure 3.5
Note: for lead acid battery, the recommended charge current is 0.2C(C-battery capacity)
Please follow below steps to implement lead-acid battery connection:
1.Assemble battery ring terminal based on recommended battery cable and terminal size.
2.Connect all battery packs as units requires. It's suggested to connect at least 350Ah
capacity battery for Solar Charger 3500.
Insert the ring terminal of battery cable flatly into battery connector of inverter and make
sure the bolts are tightened with torque of 2-3Nm.Make sure polarity at both the battery
and the inverter/charge is correctly connected and ring terminals are tightly screwed to
the battery terminals.
Figure 3.4
Recommended battery cable and terminal size:
Model
Max.
charging
Current
Capaci
ty
Diamete
r
Dimension
（
mm
）
Torque
Cross-
section
Inner
diameter
Length
Solar
Charger
3500
70A
350AH
1*8AW
G
8
6.4
23.8
2-3Nm
Table
3
.
1
