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Old 08-01-2013, 08:10   #1
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Trojan T-145 values for BVM

I have a bank of (8) Trojan T-145 batteries in a series parallel configuration. Im looking for the correct peukerts factor and also a CEF, (charge effeciency factor) to enter in my Victron BVM. I have seen peukert values from 1.13-1.15 but nothing specific from Trojan. Do I need to perform my own calculations for both of these inputs given I am using the batteries in a "bank"? If so im looking for a simple set of instructions for both keeping in mind we are ful time liveaboards with things like refridgeration that cant easily be shut down for long periods of time.
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Old 08-01-2013, 08:57   #2
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Re: Trojan T-145 values for BVM

Drop them an email. They will respond and are very helpful.
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Old 10-01-2013, 17:35   #3
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Thanks emailed them. Will wait for reply.
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Old 11-01-2013, 07:59   #4
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Re: Trojan T-145 values for BVM

According to: EV Calculator: Batteries
Trojan T-145 @ 244A/H (20 Hr)
Peukert Exponent 1.134
Peuk Capacity 345.500
0.00360 Ohms
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Old 11-01-2013, 08:14   #5
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Thanks Gord I saw that one. Any thoughts on a CEF? Charge efficiency factor? Should be like 90% but I would like to be accurate. I'm also wondering if peukerts is influenced by the size of the bank?
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Old 11-01-2013, 08:32   #6
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Re: Trojan T-145 values for BVM

This is from Trojan's tech support section:

Quote:
Generally, gel and AGM batteries have about 20% less capacity, cost about two times more, and have a shorter cycle life than comparable flooded lead acid batteries. However, Gel and AGM batteries do not need watering, are safer (no acid spilling out), can be placed in a variety of positions, have a slower self-discharge characteristic, and are more efficient in charging and discharging than flooded batteries (see table below). Gel batteries are more suitable for deep cycling applications whereas AGM batteries are more for light cycling and engine-starting applications.

Flooded/Gel/AGM
Charge/Discharge Efficiency 89% 98% 99%
Self discharge rate (per month) 13% 1-3% 1-3%
Finish Voltage 15.3-16.0V 14.1-14.4V 14.1-14.7V
Float charge: 13.2-13.7V 13.4-13.8V 13.4-13.8V
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Old 11-01-2013, 08:37   #7
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Re: Trojan T-145 values for BVM

This is data directly from Trojan. I keep it in my files for programming battery monitors. The Peukert calculators you find on the net that use RC do not often translate well to the actual manufacturer supplied Peukert..

6 Volt
T105 = 1.24
T-125 = 1.23
T-145 = 1.25
L-16H = 1.79

12 Volt
SCS-150 = 1.29 (group 24)
SCS-200 = 1.22 (group 27)
SCS-225 = 1.24 (group 31)
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Old 11-01-2013, 08:39   #8
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Re: Trojan T-145 values for BVM

As noted, Trojan lists 89% Charge/Discharge Efficiency for their flooded batteries; and 98%/99% for Gel/AGMs.

Trojan Battery Company
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Old 11-01-2013, 08:41   #9
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Re: Trojan T-145 values for BVM

Quote:
Originally Posted by Maine Sail View Post
This is data directly from Trojan. I keep it in my files for programming battery monitors. The Peukert calculators you find on the net that use RC do not often translate well to the actual manufacturer supplied Peukert..

6 Volt
T105 = 1.24
T-125 = 1.23
T-145 = 1.25
L-16H = 1.79

12 Volt
SCS-150 = 1.29 (group 24)
SCS-200 = 1.22 (group 27)
SCS-225 = 1.24 (group 31)
Thanks!
(note the difference to what I posted from evconvert.)
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Old 11-01-2013, 08:46   #10
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Re: Trojan T-145 values for BVM

Quote:
Originally Posted by GordMay View Post
Thanks!
(note the difference to what I posted from evconvert.)
Why I mentioned that those on-line calculators are not always accurate... I have asked Trojan on a few occasions to include this on data sheets or in the tech manual/users guide but I still don't see it. I'm sure if more people ask they will address this.

There is a big difference between a Peukert of 1.25 and 1.13.....
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Old 11-01-2013, 08:54   #11
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Thanks guys. Looks like for my bank of T-145's I should be using a CEF of 89% and a peukerts of 1.25.
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Old 29-08-2013, 10:11   #12
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Re: Trojan T-145 values for BVM

Quote:
Originally Posted by SV Demeter View Post
Thanks guys. Looks like for my bank of T-145's I should be using a CEF of 89% and a peukerts of 1.25.
How have these values worked out for you? I just ordered 4 x T-145's...
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Old 30-08-2013, 06:07   #13
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Re: Trojan T-145 values for BVM

I wish Trojans were cheaper. I plan on a new bank of 3. SCS 200, or 4 T-105 if they fit. Great batteries.
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Old 10-09-2013, 00:54   #14
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Re: Trojan T-145 values for BVM

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Originally Posted by zboss View Post
How have these values worked out for you? I just ordered 4 x T-145's...
I use a 1.2 exponent on initial set-up for T-145's, then after 2 condition cycles I change it to 1.14. and it remains true, for about 4 years as long as the charge cycle is set up properly.

I have a friend, who worked for Trace when this anomaly first appeared. Trace was the first inverter manufacture to publish Peukert Factors for the major bats...manufact... sold in the NW. He confirmed that the bat test for the T-45's were an anomaly, but tested to 1.14 after condition cycle everytime.

I am on the second set of set of T-45's in my own boat, first set installed 2003. They were; 2X6X3 in parallel for 12 volt nominal. I am now on the second set two years, and they are balanced to the bat mon at 1.14.

We are just back from 45 days away from shore power, an 85 watt SP, and an 3.6 kw DC generator.

Lloyd
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Old 13-07-2014, 10:47   #15
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Re: Trojan T-145 values for BVM

We have an update on my T-145's. They have been running for 305 days and have been through 25 charge cycles (according to my Mastervolt Shunt). We added solar and wind about 90 days ago but previously was relying on the alternator and 70 AMP charger.

We are using a peukert value of 1.25... the Mastervolt calculates the Charge Efficiency Factor and it is now at 94%.
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