Before Installation - NDS Dometic SMART-IN SM400-12 Operating Manual

EN
• Low battery voltage alarm.
• Low and high battery voltage shutdown.
• Overload shutdown.
• Protection against short-circuit, overtemperature, overload, and reverse polarity.
• So start function.

8 Before installation

Battery requirements
Battery type and size can strongly affect the performance of inverters. Therefore, the type of loads the inverter will be
powering and the duration of use between recharging must be indentified. To determine the minimum battery re-
quirements for an application, do the following:
1. Determine the wattage from the labels of each appliance to be used simultaneously from the inverter. Usual-
ly, power consumptions shown in watts. If it is shown in amps, multiply by the value by 230 V to determine the
wattage.
2. Estimate the number of hours the equipment will be in use before recharging of the battery.
3. Calculate the total energy required in Wh (Watt hours) by multiplying the time determined above with the sum of
wattage. Divide the result by 10 if the inverter input is 12 V, or by 20 if it is 24 V. The resulting value in Ah repre-
sents the power requirement of the application.
Note When possible, recharge the battery when about 50 % discharged or earlier. This gives the battery
a much longer life cycle, opposed to only recharging it when it is deeply discharged.
Troubleshooting interference problems
Some inexpensive sound systems may emit a buzzing noise from the loudspeakers when operated from the invert-
er. This occurs because the power supply in the sound system does not adequately filter the modified sine wave pro-
duced by the inverter. The solution is to use a sound system that has a high quality power supply, or use a pure sine
wave inverter. When the inverter is operating, it can interfere with television reception on some channels. If interfer-
ence occurs, try the following:
1. Make sure that the chassis ground screw of the inverter is connected to the ground of the vehicle.
2. Make sure that the television antenna provides an adequate signal and the antenna cable is in good condition.
3. Keep the cables between the battery and the inverter as short as possible, and twist them together to reduce
the radiated emissions.
4. Move the television as far away from the inverter as possible.
5. Do not operate high power loads with the inverter when the television is on.
Ground leak protection (excluding the SP1000I-12, SP1500I-12 and SP2000I-12
models)
NOTICE! Damage hazard
For the safe operation of multiple appliances, it is essential that a circuit breaker (residual current circuit
breaker) is built into the socket distribution circuit.
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