bts temp question

[BlackwaterPark]

Hey there, i have the bts installed half way up the side of a middle battery (4 t105re, 24v) between the two batteries in the middle, and under the temp sub menu,  the remote is reading 37° c, fet 44.7... its right around peak charging time for me, at peaks of 16-17amps... House is around 75° f.  Is this a normal temp reading?  Seems a bit high.  I was attempting to set the t-comp values when i noticed this.

[SM-Viper]

Hey there.  I'm no expert, but 37c is 98.6f and that does sound a bit high to me if your ambient temp, (your house I assume), is around 75f (23.9c). Is there some other kind of heat source nearby that could account for this? Do your batteries feel warm?

[Halfcrazy]

fets are the device inside the classic that do the switching so they will run hot if the classic is charging

[BlackwaterPark]

It's actually in the coolest part of the house.  The batteries don't feel even remotely close to that temp,  either.   Something i noticed since posting however... Under the remote reading is the "battery" reading, which was 16.6 c... is that the actual temp?  I thought it would have been the remote reading...i must be wrong about that.

[Westbranch]

Do you have an infra red temp gun? If not a belated Christmas present ?

They are indispensable for battery checking during an EQ etc...

[BlackwaterPark]

Unfortunately not.  A good hydrometer is next on the list so i can verify what the wbjr is telling me regarding the SoC.  Should I be going by wrist the temp says on the wb screen? On that screen it reports a temp of 26°C... that seems more normal.  I have yet to see an EQ cycle,  but then again is only been online for like a week.  Speaking of hydrometers, I was looking at a hydrovolt... is that a decent one?   I remember seeing a midnight solar sg tester... is that the same thing?

[Westbranch]

Hydrovolt = yes, that is a german made hydrometer, getting a good review for ease of use and  accuracy .  do a search for it here and at NAWS forum

[boB]

Those temperatures are about right.

The remote temperature sensor is on a board with some semi-warm electronics components and can't be
placed out in the open so that is why you see 37 degrees C or so.

Completely normal.

boB

[Halfcrazy]

So to explain what you see:

Battery Temp = What the blue plug in sensor is feeling
Remote Temp = The temperature on the MNGP (Display)
FET Temp = The temperature of the switching FETs should be considerably higher than ambient
PCB Temp = The temperature of the main circuit board on the classic semi close to the FET Temp sensor

[BlackwaterPark]

Thanks guys, your the best! My sole complaint about midnight solar is that you guys don't make inverters and all the other components I need that, well...you don't make.  Customer service is beyond belief.

[Westbranch]

The remote temperature sensor is on a board with some semi-warm electronics components and can't be placed out in the open so that is why you see 37 degrees C or so.
boB

boB, a question about the 'remote' temp sensor readout.  So  are you saying the board inside the KID is overriding the BTS due to the board being in a hot spot or is this really the average internal temp of the KID?

I l looked in the KID manual and searched elsewhere and could not find a mention of 'remote'

[Halfcrazy]

Is this on the Kid or Classic? On the Classic the remote sensor is on the MNGP.

So on all of our charge controllers the Battery temp is used for Temperature compensation and the FET temperature is used to thermally derate the controller. All other temperature sensors are just there for info only

[Westbranch]

Hi Ryan, guess I was thinking KID when I wrote that but thinking about both CC's.

My question is that if there is no BTS, especially the in the KID, does the 'onboard' Temp Sensor affect/control  the charge voltage?

[Halfcrazy]

No on both controllers if the BTS is unplugged it defaults to 25C or NO compensation

[Westbranch]

thanks for clearing that up..

That statement would make for a good addition to the manuals for the KID and Classic CC's