Originally Posted by le.breeze
OK so we have two 24TMX Trojan batteries now. We installed them in the trailer and they read 2/3 on the trailer monitor. Both were manufactured earlier this year. We put on trickle charger and now they read 100% on the trailer monitor. Then we looked online to see about maintenance on the batteries....wow so confusing! Thinking about calling Trojan today... Does anyone have specifics on care for the deep cycle batteries? Will the trailer system keep them recharged during use and when not using do we need a specific trickle charger? Why can't things be simple?
Well, first off, 2/3 and Full aren't on the scale for the trailer monitor. When you click the battery button it goes off the the other scale (L, F, G, C). Which stands for Low, Fair, Good, and Charging. When you see 2/3, it was actually reading "Good" (basically full). When you hooked up the charger and saw Full, it was actually reading "Charging". Your batteries could be completely depleted and as soon as you hook up a charger you'll see Charging, and potentially think they're full.
That's the problem with the onboard monitor. It doesn't actually know anything about the state of your batteries. All it knows is a point in time measurement (made from a voltage reading I believe). So, if it sees something like 13.4v it's charging, 12.8 v it's good. 12.5 v it's fair, under 12.5 v it's low (Disclaimer, I don't actually know the specific cut off voltages for each level, these are approximations)
A battery monitor that's designed for it, will give you a better reading on the actually capacity and whether or not it's 'full'. These monitors work off AmpHours instead of voltage. I see the TriMetric name come up often, but I'm sure the Dry Campers can provide a few suggestions.
(Disclaimer, I don't dry camp as the DW won't live without Air-Con, so all suggestions are based on information gathered from this forum.)
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