Im planning a dual amplifier Aftermarket audio system upgrade for my 2019 Honda Fit EX of about 1000 to 1400 watts or more if possible but I'm concerned that the factory 105 amp alternator won't be able to supply enough current for the audio system amplifier upgrades and the cars electrical system. I'm considering purchasing this Power Bastard high output alternator upgrade for the 2019 Honda Fit.

220A High Output Alternator for Honda Fit, 2017 - 2020 1.5L L4

However I'm concerned about what effect a aftermarket High output alternator will have on the cars electrical systems. Will it potentially cause any problems or damage? Apart from the Big Zero High Oitput Alternator wiring upgrade what else would I need to do or get?

I've never done this before so I have to be very sure that any High output alternator upgrade to the car won't do any expensive damage to the cars electronics. Can anyone please give me information on the aforementioned issues I'm concerned about.

Thank you

 

I would assume the sound system will not take that full power contiuously for a long time anyways. Thinking how the car electric system works, all the electric power is taken from the battery, and the alternator keeps the battery charged. Therefore, instead of upgrading the alternator, I would suggest adding a secondary battery for the sound system, separated by a relay just like in RVs. That would be the buffer and energy storage for the sound system.

 

As long as field regulation works appropriately with ELD I believe you might be alright.

12 v @ 1400 watts continuous pulls about 116.66 repeating amps. So the extra 110a would be right there. I would run dual battery (one deep cycle) one LA just to stabilize voltage and power availability.

My main concern would be the field regulation through the VR so it's not 100% all the time, thus creating what I'd assume to be high IR on the alternator effectively cooking it.

If the field control does work properly though, have at it.