Car issues dying

I recently gotten my Alternator replaced twice,  the
initial problem started when my swrv belt popped
off and I took it to shop to be replaced,  2 days
later my car needs to be jumped, the shop replaced
the alternator n 3 more days after driving with my
A/c my car felt like it wasnt getting power on
highway when pedal to the floor. I bought a jump
start box car starts up immediately, the shop told
me they replaced 2 alternator if it continues it may
be the module or something electrical any ideas?
My battery isnt bad but when they test alternator
brand new my car still doesnt put out more than
12-13 watts when mechanic told me it should be
14 or more any ideas what the real issue may be?