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Old 07-09-2013, 06:31 AM   #29
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Originally Posted by terry735001 View Post
1 24v 1 thats why you see 24v in alot of high end RVs it 1 to 1
The reason for 24V systems in cars is to reduce current in long runs of cable. Moving up to a 24V system reduces amperage exactly in half versus a 12v system. This means for long runs of cable you can run a smaller diameter cable(higher gauge). Also for large diesel motors, you need a 24V starter because the higher voltage starter will have more torque. This extra torque is needed to turn a large diesel motor in the winter due to cold heavy oil.

I think in your math you are going by RMS current(0.707 X Peak). But even if you are going by RMS you should always calculate based on wattage. Even then, you are still looking at about 7 amps (12vDC) for every 1 amp of 120AC. Keep in mind that most inverters only have 90% efficiency, so if you are using 100W of AC power, calculate the DC amperage for 111W of power.

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Old 07-09-2013, 08:23 PM   #30
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gggplaya i have a 12v system and a 24 system on the RV

i have lived off solar for house/Rv now for 6 or7 guessing years

i have had 12 24 48v systems

then all ways using a TriMetric Battery System
Bogart Engineering Products | Bogart Engineering

the numbers where all ways around what i sade and what i would see every day on stocking the numbers LOL yeah i know its not right on but around

pics are of my old houes 48v system and now the roof my rv
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