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Heat and usage, along with the type of usage, and the type of batteries is what eventually leads to their demise. There are only so many charge-discharge cycles stored in a battery and the more of those cycles used over a give time frame will hasten their "consumption". Proper charging and battery maintenance also impact batteries and varies depending on the type of battery. I think that if you had good service for 2.5 years in hot conditions with frequent use of flooded lead acid batteries such as your Trojans, that is about all you can expect. Frequent charging, minimal discharging, careful maintenance etc will yield greater longevity. I have Trojans aboard my boat and I find that it is a constant battle to keep the water levels topped up in the heat of the Caribbean. I think the Trojans battery cap design is not the best. I have to add significant amounts of distilled water every month. When I leave the boat on the hard, I have solar panels trickle charge them, but still have the caretaker plug the boat in for 6 hours one a month for a better top-up and also service the water level every month. I only use the boat for about 3 months a year, and with this regimen I get about 4 years from a set of batteries. Sad but true, the heat, the cycling, the motion etc, all take their toll.
Amel SM Hull # 335
On the hard in Antigua
---In amelyachtowners@..., <richard03801@...> wrote:
Hi have you had the batteries load tested?
When you say the boat is in use, what is the major method of charge the motor or gen set.
The alternators on the motor will most likely not top off the charge. (Note the number of over 50% discharges have a lot to do with battery life as does the quality of water used to refill them)
The gen set by way of a smart charger will top off the batteries then "float" charge. (Given you are in HK it is also important you don't over heat the battery bank. Most new smart chargers have a temp sensor that sits on top along side the batteries.
Go luck keeps up to date.
Fairbanks Yacht Group llc
Support and Sales in the Northeaster US
Cell 603 767 5330
On Nov 15, 2013, at 5:22, <crwggb@...> wrote: