I have 6 40Ah batteries to run my shack, which is a single all-band, all-mode radio, a couple of scanners and an LED strip.
The batteries are AGM. I charge them with a CTEK 3300 smartcharger http://smartercharger.com/battery-chargers/#CTEK%20Multi%20US%203300
, which I chose because it charges at over 14.7 volts (per the battery manufacturer's suggestion).
Of course, the charger puts off some fairly serious RFI on the low bands. It is bad enough when I am just charging the batteries but if I try to run the rig off the batteries while the charger is plugged in to AC it's way worse.
This noise is most prevalent from 3 MHZ to about 12 MHZ on AM, a little less on SSB. For the ham bands I use, it makes 40 meters almost unusable, 80 meters usable while putting up with the noise.
I have put some ferrite cores on the DC line to the radio and on the AC line of the charger, but I don't notice a reduction in the noise.
I don't see any indication that this charger is FCC Part 15 compliant.
Any suggestions that don't involve getting a different charger?
I am running the shack on a power supply now, which works fine, but I'd love to run it on the batteries.
P.S. This is not
related to my previous RFI question involving the low-pass filter and 10 meters. That issue was while I was running on the power supply.