Temperature Compensation Settings?

[sigp2101]

In my case (T-105 T2 Batteries) Trojan recommends addition of 0.028 VPC for every 5.55C below and subtraction for every 5.55 C above 25C.

Classic T-Comp menu looks like this:

- Comp-Mv/Deg C/Cell
- Disable/Mv
- EQ Comp'd
- R - Temp Comp Set Points - Volts

What do I do here? should first line look like this: 28/5.55/18? What about the rest?
I am confused, for example in case of Cell. Is Classic smart enough to know how many cells my system has based on specified Voltage earlier or I have to spell it out for him?

[tecnodave]

Sigp2101,


Classic does not quite set that way......

Use these values.        -5mv  per cell.      Temp comp set point 25 deg C. 

Classic does know how many cells


Math:     .028 divided by 5.55 volts equals .005045    Rounded to .005   -5 mv/ cell

Trojan specs are a bit more exact but in the Classic we set for one cell where Trojan it's for the battery.


Hope this helps.......just curious as to how you ended up with 36 volts.

24 and 48 volt systems are the most common.


First screen.      .005
Second screen.   Not disabled
EQ Comped:  no
Temp comp set point. 43.2.......ok I don't use 36 volt....my set point is 28.8....absorb set point for 24 volt Rolls-Surette & Interstate.....this is the same volts per cell



Advice.....read through the manual several times...first to get an overview....try not to get too much into the detail at first read......then read it it again.....with the first read things are still a bit gray but on second read with that overview things will make more sense.  Work out the basics

David


This is in a poor format but good information.....from interstate batteries regarding the batteries resold from U.S. Battery (rebranded as Interstate).   The format is supposed to be a chart bur apple does not always format correctly.....nor can Apple spell ...lol

(Lots of non relevant stuff edited out for clarity)

(Begin interstate doc)

Nominal Battery Voltage
Charging Current
Bulk Charge Voltage (2.4 VPC)
Absorption Voltage (2.58 VPC)
Absorption Time in Hours
Float Voltage (2.2 VPC)
Equalization Voltage (2.6 VPC)
Equalization Time in Hours

36 Volts (18 cells)
C/10
43.2
46.44
2 to 4
39.6
46.8
2


(End of interstate document)

Best battery care guide is published by Rolls -Surette.     Battery care guide.pdf  @ Rolls-Surette.com

These large format batteries are very similar in construction.  Read all info you can from them:

Trojan, Interstate, U.S. Battery, Rolls-Surette. But do use the set points for your exact battery

Crown is way different construction

There is a learning curve here, it's going to take a while!

David

<edited several times.....apple trashes ?pdf files on export>

[Vic]

sigp..,

Dave is correct.  For your batteries there IS a -- 5 mV/C spec listed on the data sheet  --  "0.005 volt per cell for every 1°C above 25°C"  The Classic is looking for this mV/C/Cell as a Temp Compensation value.

Trojan T-105 T2 data sheet  (which you have probably seen):
http://www.trojanbattery.com/pdf/datasheets/T105_Trojan_Data_Sheets.pdf

FWIW,  Vic

[sigp2101]

Trojan T-105 T2 data sheet  (which you have probably seen):
http://www.trojanbattery.com/pdf/datasheets/T105_Trojan_Data_Sheets.pdf

FWIW,  Vic

Yes I have about 5 different Trojan data sheets. Even Trojan is not consistent in their's data about same battery T-105.
I was going by this one: http://www.yhi.com.sg/cmsstatic/product/11707/T105_Trojan_Data_Sheets.pdf
since this one is specific to T2 Technology which is my batteries.

[sigp2101]

Sigp2101,


Classic does not quite set that way......

Use these values.        -5mv  per cell.      Temp comp set point 25 deg C. 

Classic does know how many cells


Math:     .028 divided by 5.55 volts equals .005045    Rounded to .005   -5 mv/ cell

Trojan specs are a bit more exact but in the Classic we set for one cell where Trojan it's for the battery.


Hope this helps.......just curious as to how you ended up with 36 volts.

24 and 48 volt systems are the most common.


First screen.      .005
Second screen.   Not disabled
EQ Comped:  no
Temp comp set point. 43.2.......ok I don't use 36 volt....my set point is 28.8....absorb set point for 24 volt Rolls-Surette & Interstate.....this is the same volts per cell



Advice.....read through the manual several times...first to get an overview....try not to get too much into the detail at first read......then read it it again.....with the first read things are still a bit gray but on second read with that overview things will make more sense.  Work out the basics

David


This is in a poor format but good information.....from interstate batteries regarding the batteries resold from U.S. Battery (rebranded as Interstate).   The format is supposed to be a chart bur apple does not always format correctly.....nor can Apple spell ...lol

(Lots of non relevant stuff edited out for clarity)

(Begin interstate doc)

Nominal Battery Voltage
Charging Current
Bulk Charge Voltage (2.4 VPC)
Absorption Voltage (2.58 VPC)
Absorption Time in Hours
Float Voltage (2.2 VPC)
Equalization Voltage (2.6 VPC)
Equalization Time in Hours

36 Volts (18 cells)
C/10
43.2
46.44
2 to 4
39.6
46.8
2


(End of interstate document)

Best battery care guide is published by Rolls -Surette.     Battery care guide.pdf  @ Rolls-Surette.com

These large format batteries are very similar in construction.  Read all info you can from them:

Trojan, Interstate, U.S. Battery, Rolls-Surette. But do use the set points for your exact battery

Crown is way different construction

There is a learning curve here, it's going to take a while!

David

<edited several times.....apple trashes ?pdf files on export>

Thanks Dave, it makes sense. One more question. What do I put as value 0.005V or 5Mv. It is big difference. What Classic expect to see there? Label is in Mv but which number is right? I am writing from my work place and I do not have Classic in front of me nor user manual. I will provide more once home.

[tecnodave]

sigp2101,

5mv (millivolt) is .005 volts.  I'm pretty sure the Classic uses the 5 mv. Nomenclature but in any case value in wrong format will be rejected as too out of range.

Hang in there, there is much to learn. The more you know about your system the more reliable it will be.

td

[ClassicCrazy]

Don't know if you have tried it yet , but using the Local Status App makes it so much easier to set everything in the Classic.  Plus you can save all the settings , and then restore them when you do firmware update and need to clear everything.

The label for temp compensation in the Local Status App  is mv so you just enter -5 

Larry

[sigp2101]

sigp2101,

5mv (millivolt) is .005 volts.  I'm pretty sure the Classic uses the 5 mv. Nomenclature but in any case value in wrong format will be rejected as too out of range.

Hang in there, there is much to learn. The more you know about your system the more reliable it will be.

td

Thanks, I will check settings this weekend and make it right if it is not already.

[sigp2101]

Don't know if you have tried it yet , but using the Local Status App makes it so much easier to set everything in the Classic.  Plus you can save all the settings , and then restore them when you do firmware update and need to clear everything.

The label for temp compensation in the Local Status App  is mv so you just enter -5 

Larry

Thanks for that bit of information. I am not there yet, so much to take care before but once I have all set up properly and running well I will be ready for another learning curb.

[sigp2101]

Sigp2101,


Hope this helps.......just curious as to how you ended up with 36 volts.

24 and 48 volt systems are the most common.

When I started with design of my system I have 2 limitations. Amount of panels I can put on limited southern exposure and weight per individual battery. I purchased my panels while ago and at that time biggest panel was 235W panel. So I ended up with 3 of these since I could fit only 3 at that particular spot which is façade of the cottage. Batteries needed to go into crawl space and therefore weight limit imposed. One person should be able to carry them in and out at all times. So, system was reverse engineered according to PV array. 30Kg battery was no brainer either.

Now C (charge/discharge rate) factor came into place. FLA batteries C value is 8 and 12. So with 24V system I would end up with to much PV and with 48V system I would need one more panel for which I did not have space. Another thing was I didn't want batteries in parallel under any condition.
So for 36V - 225 Ah system
C/12 is 675 Watts
C/8 is 1012 Watts, my PV is around 700Watts and falls right around C/10 value which I was perfectly happy with.

Now I ended up with balanced two components of the system, Classic 150 was no brainer either because gives so much flexibility for further expansion if technology allows for it - in case panels becomes smaller and more powerful. This is how I ended up hunting for 36V inverter fourth component of my system. Ideally for my size that would be 700-1000W inverter but good luck finding one.

Everybody I talked to was "first figure out your needs then design your system".  I think it is wrong approach because, where do you stop then? My approach was to build balanced system and then adopt my needs  to it.

Hope this explains it and thanks for your contribution. Appreciated.

[ClassicCrazy]

Easy enough to go back to 24 volts - just sell off one of your batteries .

It is never a bad idea to have too much available PV power since it makes up for cloudy days and short days of winter. 
Midnite is coming out with a firmware update that will let you set the rate of charge so  you won't over charge  your batteries even though more is available.  I never worried about how much I charge my flooded lead acid batteries because if a lot of power is there then the bulk voltage will climb fast , then when it gets to absorb it will taper off the charge rate to something more in line with recommendations anyway.

Larry

[grgdgreek]

Easy enough to go back to 24 volts - just sell off one of your batteries .

It is never a bad idea to have too much available PV power since it makes up for cloudy days and short days of winter. 
Midnite is coming out with a firmware update that will let you set the rate of charge so  you won't over charge  your batteries even though more is available.  I never worried about how much I charge my flooded lead acid batteries because if a lot of power is there then the bulk voltage will climb fast , then when it gets to absorb it will taper off the charge rate to something more in line with recommendations anyway.

Larry

+1

[grgdgreek]

Anyone know what temp.comp. setting rolls 5000 recommend?
Thanks ,
George

[sigp2101]

Easy enough to go back to 24 volts - just sell off one of your batteries .

That is the strategy, yes and 24V inverter.

It is never a bad idea to have too much available PV power since it makes up for cloudy days and short days of winter. 
Midnite is coming out with a firmware update that will let you set the rate of charge so  you won't over charge  your batteries even though more is available.  I never worried about how much I charge my flooded lead acid batteries because if a lot of power is there then the bulk voltage will climb fast , then when it gets to absorb it will taper off the charge rate to something more in line with recommendations anyway.

Larry

It is good to know that if it works that way, but does it? I read somewhere that Bulk and Absorb mode are same for Classic 150.

[SolarMusher]

Anyone know what temp.comp. setting rolls 5000 recommend?
Thanks ,
George

Same as 4000 serie => -5mv
A+
Erik