Protect wiring from damage. If wire conduit is not used, install the wire bushings (supplied) to
protect the wiring from damage. Clearly labeling all wiring with permanent wire markers will simplify
installation and help prevent wiring errors. Write the wire designations on the MPPT500 wiring diagram.
Documenting the installation will help troubleshoot any problems in the future. Permanent wire labels are
available from most electrical parts suppliers. Route wiring as directly as possible to the photovoltaic
panels and batteries. Take care to follow the wiring diagram exactly.
BATTERY VOLTAGE SELECTION:
SW-1 on the MPPT500 circuit board selects the battery voltage.
The switch is marked 12, 24 and 48 corresponding to the battery voltage. Select the battery voltage by
depressing the required battery voltage white switch to the right. As shipped SW-1 is set for 12 volt and
flooded battery. To change the battery from 12 volts to 24 volts, press SW-1 position 4 (marked 12) to the
left and press SW-1 position 3 (marked 24) to the right. For 48 volt operation, press SW-1 position 2
(marked 48) to the right. Position 1 on SW-1 open (as shipped) is set for flooded batteries. For sealed
batteries, depress position 1 rocker to the closed (right) position.
FOR 12 VOLT INSTALLATIONS USING FLOODED BATTERIES
NO ADJUSTMENTS ARE REQUIRED.
WIRE SIZING:
For best operation use properly sized wire. Refer to the wire size chart to determine
minimum wire size. Wire sizes specified are the minimum required, a larger wire size than specified may
be used.
WIRE SIZING CHART
TOTAL PV
INPUT
WATTS
1-10 FT
11-20 FT
21-30 FT
31-40 FT
41-50 FT
100 TO 250
WATTS
# 10 AWG
# 8 AWG
# 6 AWG
# 4 AWG
# 2 AWG
251 TO 500
WATTS
# 8 AWG
# 6 AWG
# 4 AWG
# 2 AWG
# 1/0 AWG
USE CAUTION WHEN CHANGING FUSES
FUSES:
Separate fuses are required for the solar panel and battery circuits. Use properly rated fuses in all
circuits. See wiring diagram (last page) for more information.
FUSE RATINGS:
Properly rated fuses are required in all installations. Refer to the fuse selection chart
and wiring diagram to determine the proper fuse ratings.
Summary of Contents for MPPT500
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