A tendency to suffer allergies is often hereditary. The most common causes of hay fever are: tree pollen such as elder, elm, hazel and especially birch (spring hay fever) grass pollen (summer hay fever) mugwort and hybrids such as chrysanthemum (autumn hay fever)
A power inverter, or inverter, is an electronic device or circuitry that changes direct current (DC) to alternating current (AC).The input voltage, output voltage and frequency, and overall power handling depend on the design of the specific device or circuitry.he AC output voltage of a power inverter device is often the same as the standard power line voltage, such as household 120 VAC or 240 VAC. This allows the inverter to power numerous types of equipment designed to operate off the standard line power.
A power inverter changes direct current (DC) power from a battery, usually 12V or 24V, into conventional mains alternating current (AC) power at 230V. This means that you can use one to operate all kinds of devices ... electric lights, kitchen appliances, power tools, TVs, radios, computers, to name just a few.ust connect the inverter to a battery, and plug your AC devices into the inverter and you've got portable power whenever and wherever you need it. The inverter draws its power from a 12V or 24V battery (preferably deep-cycle), or several batteries wired in parallel.