This might sound flaky,but...
Jul 13, 2006 | 09:05 PM
#1
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From: Cibolo Tx
This might sound flaky,but...
...has anyone tried running e-fans off AC from a DC-AC converter? I was wondering because you could use low-amperage fans (and avoid going to a larger alternator).
Instead of having to provide 30 to 40 amps at 12Vdc,you could use 3 to 4 amp ones running on 120Vac. Also,although there are zillions of AC fans,are there any that would fit?
Just kind of wondering,at this stage.
Instead of having to provide 30 to 40 amps at 12Vdc,you could use 3 to 4 amp ones running on 120Vac. Also,although there are zillions of AC fans,are there any that would fit?
Just kind of wondering,at this stage.
Last edited by shandy294; Jul 13, 2006 at 09:14 PM.
Jul 13, 2006 | 09:26 PM
#2
energy is a funny thing. If we could just figure out how to get an engine to run itself once the initial power is used to get it started!
On its simplest terms, you still have to feed the converter with DC power. So on the ac side you might be low on amperage draw for that particular voltage and ac/dc setting, but you still need to mathematically feed the converter with the required energy of the dc. Back to where you started.
277volts AC 10amps is (for arguments sake) 20amps on 120voltAC. Why doesn't houses use transformers to cut the amperage in half? Because you still need to feed the "line" or "power" side before you step it down or up. Make sense? You actcually have some energy lost inthe transformation as well.
disclaimer;I wasn't being mathematically accurate, just using vague comparisons.
On its simplest terms, you still have to feed the converter with DC power. So on the ac side you might be low on amperage draw for that particular voltage and ac/dc setting, but you still need to mathematically feed the converter with the required energy of the dc. Back to where you started.
277volts AC 10amps is (for arguments sake) 20amps on 120voltAC. Why doesn't houses use transformers to cut the amperage in half? Because you still need to feed the "line" or "power" side before you step it down or up. Make sense? You actcually have some energy lost inthe transformation as well.
disclaimer;I wasn't being mathematically accurate, just using vague comparisons.
Jul 14, 2006 | 06:17 AM
#3
Originally Posted by dewmanshu
energy is a funny thing. If we could just figure out how to get an engine to run itself once the initial power is used to get it started!
On its simplest terms, you still have to feed the converter with DC power. So on the ac side you might be low on amperage draw for that particular voltage and ac/dc setting, but you still need to mathematically feed the converter with the required energy of the dc. Back to where you started.
277volts AC 10amps is (for arguments sake) 20amps on 120voltAC. Why doesn't houses use transformers to cut the amperage in half? Because you still need to feed the "line" or "power" side before you step it down or up. Make sense? You actcually have some energy lost inthe transformation as well.
disclaimer;I wasn't being mathematically accurate, just using vague comparisons.
On its simplest terms, you still have to feed the converter with DC power. So on the ac side you might be low on amperage draw for that particular voltage and ac/dc setting, but you still need to mathematically feed the converter with the required energy of the dc. Back to where you started.
277volts AC 10amps is (for arguments sake) 20amps on 120voltAC. Why doesn't houses use transformers to cut the amperage in half? Because you still need to feed the "line" or "power" side before you step it down or up. Make sense? You actcually have some energy lost inthe transformation as well.
disclaimer;I wasn't being mathematically accurate, just using vague comparisons.
volts* amps = watts AC or DC
and with inverters you lose energy in the form of heat.
so in a perfect world an dc-ac inverter would do say 12vdc @20 amps = 120vac @ 2amps, but alas we do not live in a perfect world
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