Hi
I found that a 12V LED strip light with touch on/off wouldn't light when I wired it over my solar controll board. Removed it took it into the house and tried it on a seperate battery, perfect on off repeatedly every time I poked the touch pad.
So armed with a portable scope i went hunting. Didn't have to look far, right at the battery terminals superimposed on the 12V the was 5V AC spikes. 5V peak to peak and ringing for 10 micro seconds. switched the panels off still there. I have two controllers a MPPT with 750 W of solar and a PWM with 60W which will eventually moved to another building.
At this point I ran out ot time so had to shelve the hunt. But I think my easiest option is to build a little 5A common mode filter I have plenty of toroids that are suitable. Just a bit annoying that three 12V batteries in parallel (with buss bars) are not low enough impedance to keep the cr#p from a charge controller out of the connected circuits. I spent a lot of my working life keeping RF and pulse signals off DC PCB tracks.
Anyone else encountered this?
Brian