Because inverters operate from a DC (Direct Current) power source, usually a battery bank (one or more batteries), the battery source will have to be recharged at some point. (Remember that a battery discharged more than 50% is probably close to being dead.) Most cars and trucks recharge their batteries from an onboard alternator. Depending on the inverter load and runtime required, most power use applications will be covered by the charged battery, augmented by the operating alternator supplying a continuous charge to the battery. If the load is large (air conditioner, large draw power tools, large microwave, food freezer, ice cream machine, etc.), the user should verify that the installed vehicle alternator is of large enough capacity to operate the vehicle's power requirement as well as to fulfill the capacity of the inverter load. If it’s not, a motor throttle installation may be required to carry a small load, a larger alternator may be required, or a larger alternator, battery isolator and additional onboard battery bank may be required in order to meet the power requirement of the large load. Remember: it takes 12 DC Amps (at 12 VDC) to run 1 AC Amp (at 120 VAC single-phase) of power because there are voltage and efficiency factors to take into consideration.
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UPS – UNINTERRUPTIBLE POWER SUPPLY Uninterruptible power supplies provide protection against mains power faults to computer equipment. These faults include voltage spikes/interference, over voltage and under voltage, mains supply interruptions and surge protection etc. These faults can cause computer and electronic equipment that are connected to an unprotected mains supply to malfunction and/or sometimes fail. A common problem, when burning Cds, DVDs etc. any slight power interruptions to the burning process will halt the recording process and rendered the disc useless. There two type of Uninterruptible Power Supplies The lower powered and cheaper type UPS are switch-over types, when the mains supply fails, the UPS switches over to the batteries and inverter in milli-seconds which then supplies mains power to the computer and peripherals. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails. NOTE : The mains waveform from these UPS is a pseudo sine wave (i.e. not a true sine wave). The true UPS types are usually the higher KVA units (over 1500 VA) that supply continuous mains power. The mains power is connected to a charger which charges the batteries and then the inverter draws power from these batteries and converts it to true sine wave mains power to the computer equipment, therefore there is no switch over time lag when the mains supply fails.
UNINTERRUPTABLE POWER SUPPLY Batteries in the UPS typically last 3 to 5 years and it depends upon several factors. Including the number of times the unit must go on battery power and environmental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only be a float charge/voltage and a true indication of the battery voltage and condition requires the batteries to be tested under a load. If one battery is faulty in a set of batteries it will causes the whole battery system to fail and indicate a battery fault. A faulty charging circuit will not charge the batteries and will also cause a fault condition. Lower powered and cheaper type UPS are switch over types, when the mains supply fails, the UPS switches over to the battery and inverter in milli-seconds which then supplies mains power to the computer and peripherals. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails. NOTE the power waveform from these UPS is a pseudo sine wave (i.e. not a true sine wave).
The true UPS types are usually the higher KVA units (over 1500 VA) that supply continuous mains power. The mains power is connected to a charger which charges the batteries and the inverter draws power from these batteries and converts it to true sine wave mains power to the computer equipment, therefore there is no switch over time lag when the mains supply fails.
A true UPS requires a battery to be connected to the inverter at all times. Mains power is used to charge the battery constantly and battery is required to continually supply power to the inverter which then converts the voltage to mains supply voltage.
A lower powered and cheaper type UPS areswitch-over types, when the mains supply fails, the UPS switches over to thebatteries and the inverter in milli-seconds which then supplies mains power to thecomputer and peripherals. This type UPS may operate without a battery, but it depends upon the design of the UPS and the battery error detection system In most cases I doubt it can operate without a battery. You can try the UPS without a battery, make sure the battery terminals do not short against each other.
Inverters convert dc voltage to AC voltage - they don't charge.
If you have a remote/emergency power supply, it has a separate battery charger circuit - apart from the inverter... and it probably has an internal cartrige fuse. If blown, replace and retry.
If your not getting enough voltage to the inverter it will beep to let you know you don't have enough power. Most common cause is a lose connection thru your cigarette lighter. Also if you turn your key off it might be shutting down power to your plug. Make sure you have a good connection with your battery or plug adapter. You also need a good battery so you don't go into a low voltage condition which will make your inverter beep.