Trimetric monitor reading over 100% full

[GreaseMonkey]

Hey everybody.

In short, just finished installing the 2025 set in the parameters for the 4 six volt batteries with 12.7volts, 450ah and 9 amps
(450x2 / 100 = 9) right?
50/500 shunt

I'm seeing
13.1volts 1.5amps and 102% charged

I've been reading and rereading the manuals with no luck.

[Ed-Sommers]

12.7 volts is what you would see in a "resting" battery. A charging batt needs much more than that. If your batts are trojan's, the recommended charge is 14.8 volts which should be held for two to four hours before being allowed to fall to float voltage of 13.6 (I believe).

Recommend you go to the trojan.com site and look around.

Ed

[BryanL]

Keep in mind that many factors can influence effective battery energy capacity by more than 10% and few of them are programmable in electron counters like the Trimetric. That means that any calculated measure such as the "102%" should be considered +/- 10% (or more).

The numbers you cite are rather interesting. 450 AH at 12v (5.4 kWh) for four T105 sized batteries sounds about right for the 20 hour rating. That'd be at 22 amps or a bit over 250 watts. That gets into how the Trimetric accommodates the Peukert coefficient, which I understand it does. Do you program it directly or is it implied from 2 capacity measures such as the 20 hour rate and reserve minutes?

The charging profile should not matter much to the Trimetric other than its figuring the efficiency of the battery cycle.

The switch from bulk to absorption to float charge phases should be based on current flow, not the clock. That is why 14.4 versus 14.8v for bulk is not a big deal as that difference is only a slight matter of time (14.8 pushes current a bit quicker than 14.4).

Oh, and another thing - watch out for a lot of what you read on various websites. Most is not geared towards the use profile of the typical RV experience and may offer inappropriate advice (that about equalizing charges being one example recently discussed). The Highways TechTopics this month provides another example of the sort of 'April Fools' advice you can find in supposedly reputable sources as well. Take care.

[GreaseMonkey]

Quote:

Originally Posted by BryanL Keep in mind that many factors can influence effective battery energy capacity by more than 10% and few of them are programmable in electron counters like the Trimetric. That means that any calculated measure such as the "102%" should be considered +/- 10% (or more). That is the information I was looking for. The numbers you cite are rather interesting. 450 AH at 12v (5.4 kWh) for four T105 sized batteries sounds about right for the 20 hour rating. That'd be at 22 amps or a bit over 250 watts. That gets into how the Trimetric accommodates the Peukert coefficient, which I understand it does. Do you program it directly or is it implied from 2 capacity measures such as the 20 hour rate and reserve minutes? They are the Costco (Johnson Control) not trojans batteries. 225ah each paralleled to 450ah by the 2 banks. The trimetric manual says to multiply by 2 and divide by 100, thats where I came up with 9amps to enter into the meter Oh, and another thing - watch out for a lot of what you read on various websites. Most is not geared towards the use profile of the typical RV experience and may offer inappropriate advice (that about equalizing charges being one example recently discussed). The Highways TechTopics this month provides another example of the sort of 'April Fools' advice you can find in supposedly reputable sources as well. Take care.

Thank you

[GreaseMonkey]

Quote:

Originally Posted by Ed-Sommers 12.7 volts is what you would see in a "resting" battery. A charging batt needs much more than that. If your batts are trojan's, the recommended charge is 14.8 volts which should be held for two to four hours before being allowed to fall to float voltage of 13.6 (I believe). Recommend you go to the trojan.com site and look around. Ed

Thanks Ed but I was referring to The trimetric parameters and making sure I had them entered in correctly. Not the actual charging specs

The numbers that I posted were what was displayed on the meter after what I believe the Progressive Dynamics Charge Sentinel went into "float" mode. If it even is a 3 phase charger. When % charged was showing 95% It was charging at 13.6 volts and 11 amps , or I should say thats what the trimetric shows going to the batteries.