Stray- Current Corrosion, or Galvanic Corrosion, or?????...Help

[rbk]

[senormechanico]

I was kidding of course, but I DO harvest 240 volts AC off my home's roof grid tie with the Enphase system.

There's a grid tied mppt controller / inverter mounted under each panel which feeds a trunk line.

The inverters output more voltage in phase with the grid than is being supplied by the utility, hence the feed TO the grid.


If the OP is indeed getting AC from the panel(s), it's first going through some hokey inverter.

[Corrosion-Eng]

They use electronics to control the output. Those electronics require 5 volts Dc so they invert part of normal output into AC then rectify to 5 volts DC.


The AC is leaking to batteries because of inadequate smoothing.

[GordMay]

Solar cells produce DC, but you can buy PV panels with built-in microinverters, which allow PV modules to supply AC directly.
➥ AC PV Modules | Solar Panels With Micro-Inverters
➥ https://www.waaree.com/solar-ac-modu...to-get-smarter

[masonc]

Originally Posted by GordMay

Solar cells produce DC, but you can buy PV panels with built-in microinverters, which allow PV modules to supply AC directly.
➥ AC PV Modules | Solar Panels With Micro-Inverters
➥ https://www.waaree.com/solar-ac-modu...to-get-smarter

Microinverters are for grid tied systems only.

[Corrosion-Eng]

It may not be appropriate for present day domestic marine but best quality mobile homes, trucks and top quality professional, commercial and military vehicles use AC power distribution. One vessel manufacture is trialing an AC vessel.



That vastly reduces electrolysis corrosion. AC cannot create the by far primary cause of corrosion - electrolysis capable current as a particle removed in the first half cycle (Hertz) will be replaced when current reverses direction in the second half cycle.


Glen Bishop

[rbk]

Uh oh he used the ‘E’ word again

[boatpoker]

Originally Posted by rbk

Uh oh he used the ‘E’ word again

isn't that what women do for hair removal ?

[rbk]

Originally Posted by boatpoker

isn't that what women do for hair removal ?

You beat me to it

[a64pilot]

AC is more efficient and has many advantages, and to my knowledge only one real disadvantage, safety.
However AC systems may be difficult to find, I’ve not seen an AC plotter, depth finder, Radio etc.

[sailorchic34]

Originally Posted by Corrosion-Eng

They use electronics to control the output. Those electronics require 5 volts Dc so they invert part of normal output into AC then rectify to 5 volts DC.

Ah, no. For small DC power circuits that need 5v for TTL circuits, it is far easier to use a monolithic voltage regulator, that is a single part, to get 1 to 5 amps at 3.3 or 5 volts, without messing around with AC inversion.



Could it be done DC to AC to DC yes. But it's an overly complicated circuit, in low-power applications

[Uncle Bob]

Originally Posted by Corrosion-Eng

They use electronics to control the output. Those electronics require 5 volts Dc so they invert part of normal output into AC then rectify to 5 volts DC.


The AC is leaking to batteries because of inadequate smoothing.

Reminds me so much of a certain refrigeration guru.

[senormechanico]

Originally Posted by boatpoker

isn't that what women do for hair removal ?

You made me look !
You can find anything on the internet...


https://www.electrology.com/hair-rem...s-for-men.html

[transmitterdan]

OMG, not another one...

[rbk]

Originally Posted by a64pilot

AC is more efficient and has many advantages, and to my knowledge only one real disadvantage, safety.

Yes and no. Dc is ‘safer’ but Ac being more efficient, not so much. Each has its advantages and drawbacks. Biggest drawback for dc right now are economics infrastructure and technology. Our systems are all based around ac from generation, distribution to appliance and it’s cheap comparatively. But the tech to step up/down dc is advancing and very well could one day take over ac (not in our life time). Other half of the tech is our ability to produce ac vs dc but advances are being made and once the tech becomes widely available the costs should drop and the economics will follow. Dc is better for long distance transmission, safer, more efficient from lights to motors, smaller cable or more power on similar ac cable and so on. Now back to the show