Battery BMS causing RF interfernce

Submitted: Friday, Jul 31, 2020 at 18:52
ThreadID: 140305 Views:656 Replies:3 FollowUps:4
Hoping the electronics/radio engineers amongst us can confirm my thoughts.

Folks have a like jayco windup camper (minus the slide out bed extensions) with 2 x lithium batteries and Redarc manager under one of beds.

I was having a convo with folks last night at ge grey rest area east of pt hedland. speaking to SWMBO everything was fine apart from bit distant. passed phone over to old man and phone call became very patchy broken to point I hung up on them.

Would having all the elecrics under his bed be causing some form of electrical interference to the mobile phone ? .

Speaking to them today when in Port Hedland call was perfectly OK, he also mentioned he puts the AM/FM radio on her bed away from his bed for better reception as well.

Would lining the bed base with aluminum cladding assist shield the interference like a faraday shield ?

I'm also bit wary of adding too much insulation as management system gets tad warm and really needs good airflow like the built in fridge. I'm also considering installing a vent and possibly a fan to vent some heat out as done on fridge.

Thoughts welcome
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Reply By: Member - Boobook - Friday, Jul 31, 2020 at 19:09

Friday, Jul 31, 2020 at 19:09
Move the camper and try again. I seriously doubt it was any local interference that would affect a phone. Probably just a dark reception area.
AnswerID: 632782

Follow Up By: RMD - Friday, Jul 31, 2020 at 19:17

Friday, Jul 31, 2020 at 19:17
If the BMS has an operating frequency locked into it's design and it coincides with phone frequencies and/or radio frequencies then I would think being close to the BMS, interference is quite possible. Older 12v fluoro units were great for hash. Some 12v LED dimmers do
it too.
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FollowupID: 909662

Follow Up By: Bob Y. - Qld - Friday, Jul 31, 2020 at 19:33

Friday, Jul 31, 2020 at 19:33
I’m with Boobook on this. I doubt if anything would upset the UHF frequencies of current phones, other than signal shielding or poor signal.

Bob

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Can't remember most of it.

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Follow Up By: Member - Vince M (NSW) - Saturday, Aug 01, 2020 at 11:13

Saturday, Aug 01, 2020 at 11:13
The balast system on a 24v HIN light force light does the same, affects phone & radio (hard not to be close on a cab over)
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FollowupID: 909678

Follow Up By: RMD - Saturday, Aug 01, 2020 at 12:56

Saturday, Aug 01, 2020 at 12:56
Vince M
Yes they certainly do emit hash and the frequencies only have to be a division of the phone or radio frequency tuning. ie, 5 divides into 55 , 11 times so every 11th cycle of the higher unit is picking up something.
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FollowupID: 909680

Reply By: Member - Vince M (NSW) - Saturday, Aug 01, 2020 at 11:16

Saturday, Aug 01, 2020 at 11:16
While you were east of port headland did you stay at Indee Station with Colin & Betty ?
AnswerID: 632787

Reply By: Dean K3 - Sunday, Aug 02, 2020 at 18:01

Sunday, Aug 02, 2020 at 18:01
Bit hard to move camper to try replicate the same conditions, move don further west since then.

Suspect maybe something with the BMS but I'll have to try and repliacet the same situation, time will tell on that one.

Maybe signal strength issue but seems odd worked OK for one person and bugger all for another all within 2m of each other.

I gave the locations involved no point in supplying further details outside of the specified subject area.
AnswerID: 632805

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