Originally Posted by Ronald Rogala
Hi, can u explain to me why you like to break the current
to the panels... Is there any reason why its nice to do that?
I have to turn off my panels all the time, so I've mounted a big switch (actually a small battery
switch) in my targa bar, next to my 4 KC120 panels.
The problem is that a MPPT
controller uses a DC-DC converter. This takes the incoming PV power (usually ~17v), converts it to high-frequency AC, & then converts it back to DC to charge the batteries (usually 13-14v). The HF AC makes a racket in my SSB
so I have to turn off the MPPT
whenever I'm on the SSB
(& I'm pretty radio-active
). Turning off the entire PV array does that.
An alternative is to simply bypass the MPPT. I put a big(ish) switch to simply connect my PV power directly to my batteries while I'm on the SSB. The PV panels are putting out pretty pure DC so they're not a problem, & bypassing the MPPT shut down the HF noise
. But the currents are pretty high & I kept blowing up switches, so I eventually abandoned that route
, even though it's more efficient.
I've written a lot more about installing PV systems on boats here