How many amps does this stereo amp use per hour??

The average total power draw will be somewhere between 10 and 40ish watts.

Energy Use In The Home

GOTO Pg 3, The Executive Summary and look at the Graphs.

Speaking from experience, having worked extensively in acoustics, the average acoustic power produced will be less than 4 Watts and very likely less than 2 Watts.

EDIT: I have absolutely zero, nada, Zip experience with RVs and defer to everyone here as to the power required from the battery plus inverter system to provide that 10-40 Watts.

If your solar system can charge with 3A, you will be fine.

Guys, sorry I'm not technically savvy in the electronics world like you. I just asked a simple question to get in the ballpark.

Ummm forgive me for this...

How is any of this an issue? There are way and far gone too many missing values here to even make a ballpark guess as to the outcome. Is doing a dry-run driveway Chinese Fire Drill out of the question.

I know of few UH OH WRONG Practically no assumtive energy usage workups that turned out to be anything more than ludicrous.

Read the OPs parameters - he does not want to get technical about any of this. What's left is reality mirroring. If it works it works. If it doesn't it's a driveway grade failure not a ruined vacation.

Even outputting 10-20 watts per channel, you need a whole lot bigger amplifier, like 100-200 watts if you want good clean undistorted sound on the lowest Bass peaks. If your amp cannot supply the needed watts on the peak bass notes, it will distort, which most all low wattage systems do.
600 watts is not to play music screaming loud. It is needed to keep the lowest frequency Bass notes clean. And it could very well be using all the watts that are available, but only on the peaks. That's why the same music, playing at the same sound level, on 2 different amps, a 20 watt, and a 600 watt,....it will sound 10x better, especially on the heavy Bass notes.
Those low frequency notes that consume mega watts on the peaks, is consuming it for a small fraction of a second, therefore the system only needs to be fused for 20-50 watts of amp audio output.

600 watts is about 60 amps if you are drawing off the house batteries 5 amps if on 120 volts. but the Stereo draws more than that (Likely 2x) at full output

Another thing. You are not likely ever to hit Full Output with that device and thus ower consumption is reduced even farther

The only way to be sure is to plug in a Kill-a-watt meter plug the stereo into that and let it run for an hour or two.. Then by pushing buttons you get the total KWH used, total KW's used, and finally the Up Time of the meter.

Do the math and you have averages. Then we can do the math or you can do it, either way.

There's a lot of confusion here, partly because of confusion over units of measurement. The original question "how many amps per hour" asks for something that makes no sense. "amps" is not a quantity, it is a rate. Thus "amps per hour" is an acceleration. I know, "huh?"

Into the bargain, playing music does not lend itself easily to figuring out how much power (in terms of battery capacity, for instance) will be consumed. The reason is that not only does the answer depend on how loud the music is, it also depends on what kind of music, and will vary from second to second as the music plays because of both the very nature of music in general. Thus it is not amenable to simple calculation.

In purely practical terms, the only way for the OP to get his question answered satisfactorily is to see how long his battery lasts with whatever set up he has, then if necessary, add capacity to the system. If he can't get enough solar power to do the necessary recharge, then more is needed.

This is an impossible question to answer for anyone. Simply play the stereo for a typical time at a typical level, then recharge the batteries with a known charge rate and watch the clock. That's your AH rating

The reason car stereo speakers are 4 Ohm impedance is to increase power. Maximum power delivered to speakers is V*V/R(Z really). You either increase output voltage or lower the speaker impedance for highest power. All that is beside the point. There is only so much volume any human an tolerate. OP speakers would have to be unusually inefficient to require more power to achieve desired volume. That is why I suggest measuring actual DC current to get the picture.
I have Bose home audio system in my motorhome powered by an inverter and its contribution to total current at 12V nominal is less than 2A at any volume. Measured continuously by Blue-Sky IPN-PRO with shunt.

liborko wrote:
Forget 600W. Your stereo will never ever produce 600W. Average efficiency of speakers is around 95dB with one watt of power. That is a lot of noise. These things are notorious for overrating and there really is not any standard for rating. High quality home stereos are rated in RMS power usually into 8 Ohm load with stated level of distortion (THD). The only way to get any idea how much your stereo consumes is to measure DC current at 12 V at average volume and at high volume. My guess is it will be less than 3A. Multiply average DC current by hours of use to get rough estimate of ampere-hours(Ah) it will take from your batteries.

I mess around with all things audio. Your take is right on but there are two things that change the completely accurate measurement you state. Mobile speaker systems use 4 ohm speakers and the amplifiers are rated with that in mind. The amplifier will operate at a higher voltage than 12V. If only pushing two outdoor speakers, the amplifier will never output 600W (nor the 300W it is probably rated for into two channels).

FWIW, I operate two car audio amps in my truck, a 600W, four channel amp and a 1000W Class D amp. Neither sees the rated draw as I listen in moderate levels. IIRC, fusing I have is less than the highest rating of the amps. This system is powered by the single truck battery, the original I replaced at 10 yrs, 1 mon.