Originally Posted by garbonz
Hey, I thought I was as clear as mud. Or not? LOL.
The VERY short version is that most, if not all, batteries boil out because of excessive voltage at float phase and maybe at absorption phase and it is these areas to be concerned not total amperage limits during bulk charging phase. I would check the voltage set points for these two charging sections in your Magnum. If the float voltage of the charger is above the float voltage recommended by Trojan for your battery then change it or get a new charger. Charging amperage and voltage are interrelated and you can't change one without the other.
In the Magnum I have, it's expressed as a PERCENTAGE of max AMPS of the charger. 30% is where I am, but according to Trojan specs I can kick it up to around 60% with no problems. I'll stay on 30 when on shore power, and do the 60 when charging off the genset (to cut genset running time).
The other parameter in my charger it the absorption TIME which is currently set at 2 hours. I don't understand this, so am leaving it at default.
Sad part is that FR left the charge rate at 100% which is 70 amps and far exceeds the max recommend by Trojan (and the original US battery brand as well, I suspect).