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WARNING: You may observe a spark when making the connection because current can flow to charge the
capacitors in the inverter. Do not make this connection in the presence of flammable fumes. Explosion or
fire may result. Thoroughly ventilate the battery compartment before making this connection.
All power connections to your Cobra inverter must be Positive to Positive and Negative to Negative.
CAUTION: Electrical installations must meet local and national wiring codes, and should be performed by
a qualified electrician.
CAUTION: Do not connect the inverter and another AC source (such as a generator or utility power) to the
AC wiring at the same time. The inverter will be damaged if its output is connected to AC voltage from
another source. Damage can even occur if the inverter is switched off.
CAUTION: It is not recommended to operate loads at the maximum rated output for permanent or
extended periods of time. For continuous operation (greater than 60 minutes), it is recommended to
operate a load 20% less than the inverter maximum output rating. For example, for a 1500 Watt inverter,
a maximum load of 1200 Watts is recommended.
CAUTION: Loose connectors result in excessive voltage drop and may cause over heated wires and
melted insulation.
CAUTION: Reverse polarity connections (positive to negative) will blow internal fuses in the inverter and
may permanently damage the unit. Such damage is not covered by the warranty.
CAUTION: We recommend a main fuse in the battery’s positive cable to protect against DC wiring short
circuits (external to the inverter). The fuse should be as close to the battery as possible. We recommend
(1) 150 Amp ANL fuse or equivalent for the PRO 500W power inverter. The specific fuse ampere rating
should be sized to allow operation of all your DC powered equipment.
CAUTION: Remove any jewelry (watch, ring, etc.). Be careful not to short circuit the battery with any
metallic object (wrench, etc.).
WARNING: If you are making a permanent AC connection to the inverter, make sure that the AC wiring
steps are performed before any DC wiring is done. (DC hook-up energizes internal components,
regardless of the position of the On/Off Switch). Working on AC connections in such a circumstance may
result in an electric shock.
WARNING: 115 volt AC power is potentially lethal. Do not work on AC wiring when it is connected to the
inverter (even if it is switched off) unless the DC power source is physically disconnected from the
inverter. Also, do not work on AC wiring if it is connected to another AC power source such as a generator
or the utility line.
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