KellysEye
Well-Known Member
I had 2 6v Trojans in series, they lasted 5 years.
Trojan batteries - anybody used them
- Thread starter DickB
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ghostlymoron
Well-Known Member
That's not v good most users achieve much better. I'm wondering if there is a non-USA made alternative as I don't like the 'America first' philosophy of the Trump led country.
macd
Well-Known Member
TQA
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I think there was a bad batch of T 105s about 6 years ago. I had a bank of 6 and one failed after 15 months. Replaced without question once I got through to the USA manufacturers support line.
As for life I am told it is the number discharge/charge cycles that matter. I think somewhere on their site is the figure 1700. My current bank of 6 are at 1400 and counting.
As for life I am told it is the number discharge/charge cycles that matter. I think somewhere on their site is the figure 1700. My current bank of 6 are at 1400 and counting.
Angele
Well-Known Member
A combination of the number of cycles and the depth of discharge. See post #7
KellysEye
Well-Known Member
>I had 2 6v Trojans in series, they lasted 5 years.
>> That's not v good most users achieve much better.
I think the reason they lasted 5 years is we were long distance sailing so using them a lot every day.
>> That's not v good most users achieve much better.
I think the reason they lasted 5 years is we were long distance sailing so using them a lot every day.
PaulRainbow
Well-Known Member
Obviously had a pants system. Other long distance or live aboard users get many more years from Trojans. A single pair for long distance cruising is woefully inadequate, a big part of your problems.
geem
Well-Known Member
2 in series is a tiny capacity for a liveaboards. We would need eight T105s to match our current domestic battery capacity. If you don't cycle batteries they will last a lot longer. 2 T105s as a domestic bank is woefully inadequate in my opinion. I am amazed they lasted 5years so credit to the batteries
KellysEye
Well-Known Member
> 2 T105s as a domestic bank is woefully inadequate in my opinion. I am amazed they lasted 5years so credit to the batteries
The battery box could only take two and could not be expanded.
The battery box could only take two and could not be expanded.
TQA
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The size of your battery bank is related to your daily electrical needs, usually measured in amp/hours.
A cruising boat with LED lights, without a fridge and using a windvane rather than an electric autopilot could manage quite comfortably with just a pair of T 105s.
In fact I was chided by the Trojan technician for having a battery bank that was too large in relation to my daily consumption and charging capacity.
A cruising boat with LED lights, without a fridge and using a windvane rather than an electric autopilot could manage quite comfortably with just a pair of T 105s.
In fact I was chided by the Trojan technician for having a battery bank that was too large in relation to my daily consumption and charging capacity.
KellysEye
Well-Known Member
>using a windvane rather than an electric autopilot could manage quite comfortably with just a pair of T 105s
Agree we had Hydrovane.
Agree we had Hydrovane.
PaulRainbow
Well-Known Member
The important thing is to have the charging capacity to match the battery bank, or the batteries never get fully charged. There is nothing wrong with having a bank that is larger than your consumption, provided they get charged. Having a larger bank means less cycling and fewer occasions of having to run engines or generators when windgens or solar panels don't have the conditions for fully charging the batteries for a day or two.
JohnGC
Well-Known Member
For T105s.
At a fixed discharge rate.
The total (lifetime) capacity is almost constant regardless of discharge depth.
EG 1.
For a discharge rate of 11.25A (this is what Trojan refer to as the 20 hour rate).
Total (life time) capacity at 20% discharge is 180000Ah.
Total (life time) capacity at 80% discharge is 180225Ah.
EG 2.
For a discharge rate of 5A (this is what Trojan refer to as the 48 hour rate).
Total (life time) capacity at 20% discharge is 192000Ah.
Total (life time) capacity at 80% discharge is 190240Ah.
There is therefore a fixed cost per Ah which does not vary significantly with depth of discharge.
Currently Tayna's price for a single T105 is £144.95.
So the cost per Ah for the 11.25A rate is;
20% discharge - £144.95/180000 = 0.0805p
80% discharge - £144.95/180225 = 0.0804p
That's 0.12% difference.
So for KE, changing every 5 years rather than every 10 may be an acceptable solution and the cost of replacement will be spread.
There is also the advantage that, if the batteries are damaged due to misuse (EG charging failure and over discharge) then it will cost less to replace the bank.
I'm no chemist, but I suspect this is simply a result of cell chemistry.
If that is the case it will be similar for all deep discharge batteries. But other manufacturers do not publish sufficient data to check.
John.
At a fixed discharge rate.
The total (lifetime) capacity is almost constant regardless of discharge depth.
EG 1.
For a discharge rate of 11.25A (this is what Trojan refer to as the 20 hour rate).
Total (life time) capacity at 20% discharge is 180000Ah.
Total (life time) capacity at 80% discharge is 180225Ah.
EG 2.
For a discharge rate of 5A (this is what Trojan refer to as the 48 hour rate).
Total (life time) capacity at 20% discharge is 192000Ah.
Total (life time) capacity at 80% discharge is 190240Ah.
There is therefore a fixed cost per Ah which does not vary significantly with depth of discharge.
Currently Tayna's price for a single T105 is £144.95.
So the cost per Ah for the 11.25A rate is;
20% discharge - £144.95/180000 = 0.0805p
80% discharge - £144.95/180225 = 0.0804p
That's 0.12% difference.
So for KE, changing every 5 years rather than every 10 may be an acceptable solution and the cost of replacement will be spread.
There is also the advantage that, if the batteries are damaged due to misuse (EG charging failure and over discharge) then it will cost less to replace the bank.
I'm no chemist, but I suspect this is simply a result of cell chemistry.
If that is the case it will be similar for all deep discharge batteries. But other manufacturers do not publish sufficient data to check.
John.
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