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Old 06-26-2011, 11:52 AM   #1
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Inverter advice.

My inverter, 800 watt digital readout Duracell, has expired-quit-died. I'm sure I hooked it up following supplied directions to the "T." I'm powering it with 480 Amps. The inverter worked for a little while, an hour or so, and now it's headed to the inverter graveyard.

Question: Is 480 Amps too much to connect to an 800 watt inverter? I wouldn't think so, volts are volts, right? Anyway, I'm open for inverter recomendations. I never use more than 400 watts.

Thanks
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Old 06-26-2011, 12:51 PM   #2
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Boyd,

Power, as measured in watts, is a function of amperage times voltage.

The voltage you are feeding the inverter is 12 volts. Amps drawn depends on LOAD. If you normally use 400 watts, then 400 watts divided by 12 volts means you are pulling 33 amps from your battery continuously.

I seriously question you have a battery bank capable of delivering 480 amps per hour. Most batteries used in the industry are rated from 50 (cheaper Dual Purpose Marine batteries) to 200 amp hours (dedicated 6 volt "golf cart" type deep discharge batteries).

Remember if you have 6 volt batteries then the amp hours of the battery are not summed together when they are connected in series to provide 12 volts.

So having said that any GOOD 500 to 1000 Watt True (Pure) Sine Wave inverter will work well for you.

Samlex 600 Watt 12 Volt Sine Wave Inverter
Samlex 1000 Watt 12 Volt Sine Wave Inverter
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Old 06-26-2011, 01:59 PM   #3
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Amperage ~ Ah

Thanks for the information, I always feel more confident after sitting in your class.

My rig/coach (Not including the engine battery) has a total of four 12 volt batteries. One is a 60 Ah from the factory and three aftermarket 140 Ah. I think that totals 480 Ah when wired in parallel. But, here again, I'm the student.

Thanks Herk, later, I'm going battery shopping.
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Old 06-26-2011, 07:20 PM   #4
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Quote:
Originally Posted by Boyd View Post
Thanks for the information, I always feel more confident after sitting in your class.

My rig/coach (Not including the engine battery) has a total of four 12 volt batteries. One is a 60 Ah from the factory and three aftermarket 140 Ah. I think that totals 480 Ah when wired in parallel. But, here again, I'm the student.

Thanks Herk, later, I'm going battery shopping.
Sounds like you have plenty!

However I would remove the 60 AH battery and replace it with an exact duplicate of the remaining three. The lower capacity battery is a drain on the system since the other three will be constantly trying to charge the 60 AH battery. When wired in parallel cells with equi-length battery cables like they are supposed to be, the drain is evenly distributed over all four batteries. This causes the 60AH voltage to drop lower then the other 3 as its capacity is used up before the others.

While the photo is of 6 - 6 volt batteries; for explanation purposes treat the 2 sixes as a single 12 volt battery. So:

Here is how a 3 battery bank of "12 volt batteries" is wired as three "cells". A four battery bank would be wires similarly. Remember the positive lead from the camper goes to the FIRST battery positive and the negative lead goes to the LAST battery in the bank.

The attached article explains it better than I can.
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