ohm load on stock elec.?

[terra 5,000+ posts]

Is there a difference in terms of the load on my stock electrical between running 1200 watts at 2 ohm as opposed to .5 ohm? if so could someone explain why?

and how do u figure out how many watts my stock alt can support? saw a formula somewhere but i cant find it

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[ent3rdadragon 10+ year member]

I don't think so because you're still running 1200 watts. The amount of current needed to dish out 1200 watts will still be the same I think.

 

[terra 5,000+ posts]

I don't think so because you're still running 1200 watts. The amount of current needed to dish out 1200 watts will still be the same I think.

thats what i assumed but im not really 100% when it comes to affects of ohm loads

 

[terra 5,000+ posts]

bump

 

[IgnoreMe 5,000+ posts]

Is there a difference in terms of the load on my stock electrical between running 1200 watts at 2 ohm as opposed to .5 ohm? if so could someone explain why?and how do u figure out how many watts my stock alt can support? saw a formula somewhere but i cant find it

yes there is. the higher your ohm load, the higher your efficiency.

2000 watts @ 2 ohms pulls X amount of amps @ 90% effeciency.

2000 watts @ .5 ohms pulls a good bit more amps @ say, 70% efficiency.

so yes, you need more amperage to run the same amount of power, at lower loads.

 

[terra 5,000+ posts]

yes there is. the higher your ohm load, the higher your efficiency.
2000 watts @ 2 ohms pulls X amount of amps @ 90% effeciency.

2000 watts @ .5 ohms pulls a good bit more amps @ say, 70% efficiency.

so yes, you need more amperage to run the same amount of power, at lower loads.

so then itd be easier for my car to push the 1500 i want at 2 ohm? good to know. thanks

 

[bumpin buick 5,000+ posts]

90% and 70% are just example numbers correct?

 

[IgnoreMe 5,000+ posts]

so then itd be easier for my car to push the 1500 i want at 2 ohm? good to know. thanks

correct.

 

[IgnoreMe 5,000+ posts]

90% and 70% are just example numbers correct?

sort of.

i have seen the zx2500.1, where people have claimed to see 90% efficiency @ 4 ohms (calculated, so it doesnt factor in the power factor and what the amps are truly putting out, so it would be a bit skewed). and then i have seen the 20.1 from IA sit at ~65% efficinecy (more accurate for the 20.1 because the lower your impedance is, the more accurate your power results are, even when you dont factor in the power factor) because they were wired to .35 ohms or something similar.

average efficiency for 1 ohm is usually in the 70-75% range for class d amps.