2.0 SAFETY INSTRUCTIONS
• Follow these instructions carefully during installation.
•
WARNING
- Be very careful when working with batteries. Lead
acid batteries can generate explosive gases, and short circuits
can draw thousands of amps from the battery. Read all instruc-
tions provided with the battery.
• Do not exceed the voltage or current ratings of the controller.
Use only with a 12 volt battery.
•
Do not SHORT CIRCUIT
the solar array while connected to
the controller. This will
DAMAGE
the controller.
• The negative system conductor should be properly grounded
for most effective lightning protection.
3.0 OPERATION AND FUNCTIONS
• 100% SOLID STATE: All power switching is done with
MOSFETs. No mechanical relays are used.
• The SunGuard wires are rated for outdoor use, size 16 AWG,
with Hypalon insulation.
• BATTERY CHARGE REGULATION: SunGuard uses an
advanced series PWM charge control for constant voltage
charging. A true 0 to 100% PWM duty cycle is very fast and
stable for highly efficient charging.
• TEMPERATURE COMPENSATION: A sensor measures ambient
temperature and corrects the constant voltage setpoint by
–28 mV per ˚C with a 25˚C reference. This works best if the
SunGuard and battery are in a similar thermal environment.
• The SunGuard prevents the battery from discharging through
the solar array at night. There is no need to install a blocking
diode for this purpose.
