Trojan and other batteries

As many of you will know I’ve had countless problems over the years with leisure batteries, mostly related to the fact I was ignorant of battery technology and use in the early days.
I bought 4 x 120 ahr lead acid batteries, then I replaced them with 6 x 110 ahr batteries, they got replaced with 5 x 85 ahr batteries, which were replaced with 6 x 80 ahr batteries, which were replaced with 2 x 240 ahr batteries. Oh yes, I’ve spent a fortune on batteries!

I also spent a fortune on fuse boxes, connectors, distribution boards, and cabling, several hundred pounds on cabling alone would you believe, as you have to have thick cabling to prevent voltage loss. I also attribute the early demise of my original leaf springs to the sheer weight of carrying batteries in the rear of the van. Currently the 60 kg Trojans live behind the front seats so at least they offer traction to the front wheels.

Anyway, both inverters I’ve owned have an alarm that sounds when you hit 10.5 volts, so often I would wait til the alarm went off then recharge. I never realised at the time that draining batteries below 12 volts actually damages them. The Trojans claim you can occasionally discharge right down to 20% of their total rating without damaging them although I’ve never tried that.

I also used to mix and match batteries: 1 x 120 ahr with 2 x 100 ahr batteries, and 2 x 100 ahrs with 2 x 85 ahrs. I never knew that this also decreases efficiency and longevity of the batteries. Often batteries would be part charged and then left for long periods. This was another thing that I never knew affected batteries lives and effectively breaks them prematurely.

So it is with no surprise that you’ll here I broke all of the batteries I’ve ever had. I recall being in Rouen and having to run the gennie every day to enable me to work. 1 set of 6 batteries actually only lasted months before starting to deliver much lower voltage, a consequence of being discharged too far on a regular basis.

The ones that lasted best were Elecsol. They were billed as super light as they used carbon fibre technology, and supposedly could be discharged down lower than any other battery with almost no damage, and remain discharged again, with no damage. In eventually broke all of those too.

When I learned about exactly where I was going wrong was when I bought the 2 x 240 ahr Trojan batteries. They’re massive with tons of lead in and are built to be reliable and withstand bad treatment. However I have treated these better than any other battery by never discharging them below 12 volts, never leaving them discharged for long periods, and always charging them fully instead of part charging them.
The fluid level dropped in them once when I forgot the check the electrolyte level when I drove to Italy, but it wasn’t low enough to damage the lead plates thankfully.

However, in the time I’ve had them they are now giving less performance than they used to do. When I first noticed this I was incredibly disappointed given the Trojans great reputation and their price, however thinking more about it though I realised that I’ve had them over 2 and a half years, and I did almost boil them dry, and they do get recharged every 3 days and at £550 or something, they come in about the same as the 80 ahr Elecsols which cost almost £100 each for 5. The Elecsols lasted about the same amount of time, although I treated them very, very badly. However, at the age that the Trojans are now, the Elecsols were effectively wrecked. On balance it makes me wonder if I’d treated the Elecsols well, I wonder how long they would have lasted?

So I probably need to think about new batteries but given that my solar panels help to keep the batteries topped up and it’s coming up to spring, I reckon I can safely leave the decision til late autumn and see what deals there are at that time.

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