I was wondering if anybody had any thoughts on whether it is possible to implement powerline communication on a lead-acid battery fed-12V power network.

Characteristics:

 - voltage: 12 V
 - Fed by a battery-bank of 3 X 140 Ah, AGM lead-acid, non-spiral
 - typical currents: 2-150 A
 - wires: stranded copper 1.5 mm² to 50 mm², PVC isolation
 - wires for powerline communication: 30 mm²
 - typical wire lengths: upto 30 m

My worry is two-fold:

 1. will I be able to drive up the voltage in the system to allow communication - or is the battery going to "absorb" it as "charging" current?
 2. how "noisy" is such a network typically in the frequency range of 133kHz? I.e. how strongly am I likely to have to drive it to enable communication? (The system comprises several 12V DC motors, an alternator, chargers, etc.)

For implementaion I am looking at Cypress CY8CPLC10 and similar.