Battery charger - electrical interference

Submitted: Wednesday, Jul 12, 2017 at 13:11
ThreadID: 135241 Views:5879 Replies:3 FollowUps:18
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To the electrical gurus out there please

Its a 40 ah 5 stage 240v charger that causes the following frustrations. (But firstly a description of the power/sound system set up in the caravan)

# The van is wired so that the radio feeds to roof speakers
# The TV sound is connected via jacks and cable to the radio and hence the speakers
# Our van is all 12v (compressor fridge etc) and the issue is only relevant when we are forced to stay in caravan parks and the solar panels are shaded at that site...hence we need the 240v.

* When on "battery charge mode" it causes significant electrical interference to the sound system in the caravan. ...a high pitched oscillating whining noise making the sound system unusable.
* When on "supply mode" the issue goes away
* If I pull the sound out jack from the TV then the issue goes away ( when on battery charge mode) and we can listen but the TV speakers leave a lot to be desired as far as volume and sound quality.
* What I cant understand is that on supply mode our house batteries are slowly losing charge.......now after 4 days they are down to 74% SOC.........
* They would be a down to less than 50% ...in this time frame out in the bush with solar panels inoperative (like now) so therefore they must be getting some trickle top up from the 'supply mode'...but are losing ground

< So what is "supply mode" doing...a constant 12v supply I guess...and some trickle charge?...Like a full charge battery connected in Parallel to a discharged battery...they sort of equal out?

## If we run the generator out in the bush on battery charge mode the genny hunts something chronic....like fuel starving........I assume the charger electronic conflict with the genny electronics?....

Appreciate some diagnostic help please and and a fix if possible and a more definitive understanding of what the 2 modes are meant to do

Cheers

Life is a journey, it is not how we fall down, it is how we get up.
VKS 1341

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