18
Section 5 |
operation
To get an estimate of the current (in Amps) that the battery is delivering to power a particular AC side
load, divide the load's AC consumption power (in Watts) by (10).
Keep in mind that most appliances are not operating for long periods of time. for example, a typical
home-use coffee maker draws 500 Watts during its brew time of 5 minutes, but it maintains the
temperature of the pot at about 100 Watts. Typical use of a microwave is only for a few minutes,
sometimes at low power. Similarly, refrigerator compressor does not remain oN at full rated power at
all times but switches oN and off based on its thermostat setting, ambient temperature, frequency of
opening/closing and the temperature of food item(s) when first stored. As a rule of Thumb, its operating
Duty Cycle [oN Time ÷ (oN Time + off Time)] is around 30%. Hence, a refrigerator rated at say 100W
will draw Watt-Hour energy of 720 Watt Hour in a 24 Hour cycle [(100W x 24Hrs) x 30% = 720W]. Some
exceptions to brief operating times are TVs, computers etc.
In most instances, the inverter can be left connected to the battery when not in use. However, make sure
that the inverter is switched off using the oN/off Switch (2 in fig 3.1.1 and 3.2.1) or using the oN/off
button on the remote Control Model SSW-r1-12b (Section 4.9). This will prevent unnecessary drain on
the batteries due to self consumption and operation of cooling fan(s).
battery performance drops in low temperature environment. Higher capacity batteries should be
installed if the environmental temperature is below 20
o
C.
note: Please see detailed symptoms, causes and remedies in the troubleshooting Guide at Section 7.
sectIOn 6 |
Protections
6.1 oVeR teMPeRAtURe PRotectIon
The unit is cooled by 2-speed fan(s) (9 in fig 3.1.2 and 3.2.2). The fan(s) will run at slower speed from
the time the unit is switched till around 10% of rated power and at full speed thereafter. In case the
fan(s) fails or if the cooling is inadequate due to higher ambient temperature or restricted air flow, the
temperature inside the inverter will rise. Temperature rise is sensed at one of the DC side Mosfets. If this
temperature exceeds 90-100°C, the AC output will be switched off. The inverter will be latched in off
condition till it is manually reset by switching off the oN/off switching, waiting for 15 min for the unit
to cool down and switching oN again.
refer to Section 7 - Troubleshooting Guide for more details of symptoms, causes and remedies related to
this protection.
6.2 LoW BAtteRY VoLtAGe PRotectIon
This condition is not harmful to the inverter but could reduce life of the batteries. The inverter
automatically shuts down when input voltage drops to 10.5V ± 0.3V. Auto-reset at 11.5 ± 0.2V.
refer to Section 7 - Troubleshooting Guide for more details of symptoms, causes and remedies related to
this protection.
6.3 oVeR VoLtAGe PRotectIon
The inverter will automatically shut down when the input voltage exceeds 15.3V ± 0.3V. The unit will reset
automatically when the voltage drops to 14.9 ± 0.2V. Input voltage exceeding 16V could damage the inverter.
refer to Section 7 - Troubleshooting Guide for more details of symptoms, causes and remedies related to
this protection.
Summary of Contents for SSW-1000-12A
Page 25: ...NOTES ...
