The battery can provide a buffer in the meantime. And even your amp, since even it's actual 7.5 amp power rating is only at high volumes and only when the music is really 'hitting'. Which is plenty for charging a few devices, running lights, etc. The 900 has about 6 or 7 amps of extra electrical power, if I remember correctly, according to the manual. There might also be an 'RMS' rating on the amp that could be accurate, which will give realistic power. If it is, you're around the 45~90 watt total power range. They just all advertise differently because, well, their job is to separate the money from you and your wallet. The reality is, it's probably somewhere in the 45w of actual power range like most amps. So unless you mounted a pair of aftermarket diesel truck alternators onto your 900 it's not running anywhere NEAR that. Given the inefficiencies that go into the voltage stepping and switching in an amplifier (22 watts RMS is the max on 12 volts so amps have to do some fancy footwork to get more power, by stepping up the voltage and drawing more amps) if your Amp was actually 2,000 watts (or even CLOSE to it) It would be drawing around 300~330 amps. There are plenty of car amps out there that will require a larger alternator and a bigger battery on a CAR and a stock alternator on a sub-compact from China is still much more powerful than the anemic charging system of the 900.Ī decently powerful car head unit is probably the limit for a stereo setup alternatively, one of a number of motorcycle amplifiers.

Point being, large car amplifiers and the like are going to suck a lot of juice.

Somewhere there should be an RMS output which is going to be a down to earth number, like 90 watts, which is what your actual output is. Click to expand.Amps are NOTORIOUS for severely over-estimated output.

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