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Inverter opinion

Discussion in 'Questions From New Drivers' started by Elendil, Apr 7, 2011.

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Apr 9, 2011 #11

scottied67 Road Train Member

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Mar 14, 2010

california norte

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dab11999 said: ↑

Most power cigarette lighter receptacles on the dash or in the bunk are designed to handle 150 watts. If you are using more than that, then you need to connect directly to the battery.
Watts = Volts x Amps
example; 19volts x 1.5 amps = 28.5 watts
As for sine wave, it does help give a better deep cycle battery charge for laptops. You can get around that by keeping it plugged in and not using the battery as much as possible. Doesn't really effect cell phone chargers.
As for how long you can use it without the running the batteries down depends on how much reserve capacity your batteries have. As batteries get older they lose their reserve capacity until they eventually can't hold a charge. If you run an inverter you will need to keep your batteries in good shape.
Reserve Capacity, (RC) is a battery industry rating, defining a battery's ability to power a vehicle with an inoperative alternator or fan belt. The rating is the number of minutes a battery at 80 degrees F can be discharged at 25 amps and maintain a voltage of 10.5 volts for a 12 volt battery. The higher the reserve rating, the longer your vehicle can operate should your alternator or fan belt fail.
If you are using more than 25 amps through an inverter then you will need to adjust for the amount of time. The higher the amps, the lower the minutes. Reserve capacity is usually on the battery label. As a rule of thumb, when using an inverter, start the motor every two hours.
Click to expand...

So something drawing 25 amps would last about 1 hour?--

25 amps times 10.5 volts = 2500 watts? more or less.

Is it 1 hour for 1 battery or 1 hour for 4 batteries?

scottied67, Apr 9, 2011

scottied67, Apr 9, 2011

#11
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