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Re: can 15 volt power adaptor be used on an 18volt...
Yes and no.yes you can use but there will be a slower or intermittent power.its best to use an adapter having same specs compatible with your unit.and no, because your adaptor may overheat and end up losing your adaptor, too.
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The charger input voltage should make no difference on the output voltage / current, if they are designed to run on that input particular voltage. A 240 volt charger will not work on 110 volt and vice versa. If in doubt check the output voltage of the charger with a voltmeter. Make sure you are getting around 20 volts dc.
The power adaptor has normally two voltages.
One is primary (Input) which is 110V AC in USA. 220V in UK and others.There are now a days Adaptors which accept both 220V and 110V. However the Adaptor pin will differ. It will be Flat pins for 110V and Round pins for 220V.
The other voltage is the Output which is fed to the Equipment and is Equipment specific. It can be 18V to 5.2 Volt DC. It varies equipment to equipment.. If a wrong Adaptor with output Voltage not matching with equipment requirement is selected, it may damage the equipment. Be careful.
Battery voltage is high, suspect alternator over charging and affecting the monitor. Connect an external volt meter across the battery and start engine 15volts or above will cause problems. If left charging high, it can shorten the life of the battery and damage electronics of the vehicle, things like abnormal amount of bulbs blowing. All electrical equipment is made to operate at around 13 volts with a percentage tolerance, constant running at a higher voltage will cause damage.
The voltage difference will not matter. This sounds like it is a poorly designed power supply. I suggest calling Shure Parts (800-516-2525, option 3) to order a new power supply that will work with the L4 receiver.
KVA is voltage multiplied by current. So if your genset can supply 450KVA at 15 Volts, by dividing 450 by 15 we get the maximum current available to be 30 amps. However you should never draw the maximum current as it would put a strain on the supply. It would be safe to draw up to 25 amps at 15volts
You can use any adaptor that supply 12V or more. If you have at least 800ma of current, and 12V or higher it will do the job. Higher voltage rating will charged it much quicker but you have to watch it.
First off it?s a fairly risky proposition to plug a power adaptor from one device into another without making absolutely sure it supplies the correct voltage, amperage and has the correct polarity. Your laptop needs 18.5 volts, 3.5 amps, and approximately 65 watts to charge the battery. If you power adaptor is less that 3.5 amps it will shut down to prevent any damage so that?s probably what is happening.
I would suggest going to the HP (now owns Compaq) or Ebay web sites and purchasing a replacement there.