Club 80-90 Forums

http://www.ebay.co.uk/itm/12v-105AH-Tro ... 19d86b8546" onclick="window.open(this.href);return false;

this is the one im thinking of, does it look ok ?
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If you're having a trojan I'm surprised you're having such a small powered one.
Have you looked at the 6volt range?

I did look at those kev , we don't do much camping off grid it was more about getting a battery that could take a bit of a discharge and recover when recharged. the one I have now has never really recovered after I left a light on in the vans cupboard

jeffdub wrote: it was more about getting a battery that could take a bit of a discharge and recover when recharged. the one I have now has never really recovered after I left a light on in the vans cupboard

At the risk of "banging on" = LINK to LVD

bigherb wrote: Nope it depends on the standard rating that is used, 20 hour, 8 hour rate etc. A 100 ah battery rated at 8 hour has a larger capacity than a 100 ah battery rated at 20 hour.

Yes, but i was talking about theoretical maximum Ah. Your comment is valid up to a point. If you run a 100ah 8 hour rated battery at a lower current (say 5A) you will get better figures than the battery rated at 100ah 20 hour. Because they are different sized batteries - not because they defy physics.

The hour rating in terms of capacity just signifies how long a battery can perform before things start going strange (eg temps change and voltages drop).

It doesnt change how much potential energy a battery can hold - just changes how well it can be delivered. Which is of course absolutely the most important thing to consider (so i agree that you should choose a battery dependent on your applications hour rate).

The same battery will have different charge rate figures. And surprise surprise, drawing a lower current will give you better overall capacity than drawing a high one.

Cheers,

Ringo

bigherb wrote: Nope it depends on the standard rating that is used, 20 hour, 8 hour rate etc. A 100 ah battery rated at 8 hour has a larger capacity than a 100 ah battery rated at 20 hour.

Problem is most makes of battery fail to tell what rating they have used. I can only find one brand which tells you which they have used (Banner)

http://www.trojanbattery.com/pdf/TRJN01 ... cGuide.pdf" onclick="window.open(this.href);return false;

if you scroll down there's a lot of information regarding trojan AH battery spec

kevtherev wrote:http://www.trojanbattery.com/pdf/TRJN01 ... cGuide.pdf

if you scroll down there's a lot of information regarding trojan AH battery spec

So if we take the battery linked to in this post ,a 24TMX, it is being sold as a 105ah but if you look at the tech sheet it is only 85ah at 20hr rating. The 105ah rating is at 100hr rating

I'm not saying the battery is a bad battery but just saying it's confusing comparing different capacities of battery's like for like

windysurfer wrote:
So if we take the battery linked to in this post ,a 24TMX, it is being sold as a 105ah but if you look at the tech sheet it is only 85ah at 20hr rating. The 105ah rating is at 100hr rating

Yep that's the point you can't compare two batteries of the same stated capacity unless you know the test standard. Your example gives only around 11 amps more capacity than the 100 72-74ah SLI battery we normally fit.

bigherb wrote:

windysurfer wrote:
So if we take the battery linked to in this post ,a 24TMX, it is being sold as a 105ah but if you look at the tech sheet it is only 85ah at 20hr rating. The 105ah rating is at 100hr rating

Yep that's the point you can't compare two batteries of the same stated capacity unless you know the test standard. Your example gives only around 11 amps more capacity than the 100 72-74ah SLI battery we normally fit.

That's very interesting.

bigherb wrote:

windysurfer wrote:
So if we take the battery linked to in this post ,a 24TMX, it is being sold as a 105ah but if you look at the tech sheet it is only 85ah at 20hr rating. The 105ah rating is at 100hr rating

Yep that's the point you can't compare two batteries of the same stated capacity unless you know the test standard. Your example gives only around 11 amps more capacity than the 100 72-74ah SLI battery we normally fit.

Which is why I was surprised Jeff went for the 12v instead of 6V

kevtherev wrote: Which is why I was surprised Jeff went for the 12v instead of 6V

What difference is it going to make?

bigherb wrote:

kevtherev wrote: Which is why I was surprised Jeff went for the 12v instead of 6V

What difference is it going to make?

Looking at the data sheet, a 6v T-105 costs £227 for two giving you 250AH at the 100hr rate.
http://www.ebay.co.uk/itm/T-105-T105-6V ... 3f2a5cbf02

To get even close to that sort of capacity with 12v you are looking at £350

Am i reading the chart correctly?

Ringo

yes

So I'd be better off fitting 2 6v batteries , it would give me more options for a weekends camping, fit an lvd thingy and just charge them at home every so often ?