Help With Low Charging Voltage

[Skyliner33]

After reading posts by @Dellmassive I decided to get a Quicklynks bluetooth battery monitor 2.

SO having installed it on the leisure battery I decided to have a look at what the App does.

A couple of tings have surprised me.

1. I did a charge test, and I'm now worried I might have a problem:




2. Its now 45 mins since I got out out of the van. My battery appears to still be charging.

 

[Deaky]

Definitely not right. What DC-DC charger are you using?

 

[Dellmassive]

Glad you like the BM2 unit..

Dont worry too much about the bit in tests as they are more specific to a standard alternator system and not so much the stop/start system in the T6.

I take it your not running solar?

Also how is the leisure batt charged?

Factory relay or DC-DC charger?

 

[Dellmassive]

Oh also the 13.5v seems high for 45mins later.

They call it surface charge.... so if you switch on a load for a min or so its should settle the battery to its rest voltage of 12.6v or below.

Here's my readout from yesterday....

.

 

[Dellmassive]

Did you connect the BM2 direct across the battery... and have you double checked the voltage reading with a multimeter?

 

[Skyliner33]

Thanks for the replies guys.

No solar

Redarc 1240 dc-dc charger for charging the leisure battery.

Did you connect the BM2 direct across the battery... and have you double checked the voltage reading with a multimeter?

Yes, directly across the leisure battery. I thought that was the best way?

 

[Skyliner33]

More info. DMM has a flat battery or its broken.
Voltmeter wired to leisure battery is reading 13.1V now.
App reading was at 13.14V.

The voltmeter with ignition off is 13.0. It’s usually at 12.9 or 12.8

 

[Dellmassive]

same as me

Redarc BCDC1240-LV

 

[Dellmassive]

View attachment 45558 View attachment 45559 More info. DMM has a flat battery or its broken.
Voltmeter wired to leisure battery is reading 13.1V now.
App reading was at 13.14V.

The voltmeter with ignition off is 13.0. It’s usually at 12.9 or 12.8

That sound like a good battery that . . . . LOL.

still sounds like surface charge to me that will gradually drop back down to the 12.8v..

have you got any loads that you can switch on (connected to the leisure battery) for a few mins to bleed off the surface charge?

or more to the point . . . . what IS connected to the AUX battery?

 

[Dellmassive]

heres a few readouts from my crappy 75Ah oem AUX battery. (it seems to like sitting at 12.3v)

.

 

[Dellmassive]

and here are a few readout from the OEM starter battery . . . .

.

 

[Skyliner33]

Do you have the BM2 on the starter as well?

Aux battery is a 110Ah AGM and at the moment is connected to..... well not a lot yet. Some LEDs in the tailgate, the voltmeter, a usb charger and a 12V cigarette charger socket. (these have a switch and are left off most of the time.)

 

[Dellmassive]

I have a second BM2 on the starter . . . . . and a few others else where.

but all connected to the same app on the phone. ( just add them as you did the first)

like this :

 

[Dellmassive]

Did you run your rear LED lights for a while?

Has the battery voltage settled?

 

[Skyliner33]

Did you run your rear LED lights for a while?

Has the battery voltage settled?

Not had time yet. Will give it a go later and report back.

 

[Dellmassive]

so whats does yesterday and todays BM2 readouts look like?

 

[Skyliner33]

so whats does yesterday and todays BM2 readouts look like?

I’m not sure why the big spike yesterday

 

[Dellmassive]

very nice, looks like you have a very good battery there.... (no problems, all look perfect)

it taking 6+ hours to settle back down of its own accord.....signs of good battery cell health.

Have a you got a couple of pics of your battery/redarc/bm2 setup?


your be getting a second one now for your starter battery next . . . . lol !

 

[Skyliner33]

As requested. Pics of setup:
Back of drivers seat:


Front of drivers seat


Behind the panel


A month or so ago.

 

[Dellmassive]

Nice, what battery was that?