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Old 03-17-2017, 05:20 PM   #15
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Don, as usual, excellent advise. I wish I had access to your knowledge when I was "cooking" my T-105's on my previous coach. It makes sense now.
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Old 03-17-2017, 06:01 PM   #16
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Quote:
Originally Posted by CampDavid View Post
Don thank you so much for your help. However I have a ME2012 Inverter that I believe is only a 100 amp charger. (see below)Also here is a shot of my batteries

How would that change your advise on the proper settings for my Insignia.
Thank you again for your help
David,

With the ME2012 set your charge rate to 60% (450AH battery bank X 13% = 58.5 AH). The rest of the setting stay the same as in the previous post.
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Old 03-17-2017, 07:18 PM   #17
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Thanks, Don, for the excellent explanation.

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Originally Posted by 757driver View Post
Marc,

You are correct, the higher the charge rate the quicker the batteries will be charged and thus less generator run time. When batteries are heavily charged they heat up. Too much heat even for AGM batteries is not good. To show how much heat is generated look at your BTS (battery temp sensor) under the TECH button before you start charging the batteries and check the same reading an hour or so later. For a discharged battery the reading will be higher after an hour.

With most flooded batteries the industry average for rate of charge is 10-15% of the C20 rating so a 400 AH battery pack should be charged at 40-60 AH. If you have a Magnum 2812 inverter it has a 125 amp charger in it. The charge rate for this inverter should be set to 40-50% of the chargers rated output. If it is set much higher you get much more gassing and excessive heating.

For the Discover AGM batteries ( and most other AGM batteries) they can tolerate a higher rate of charge to a point. Discover recommends a charge rate of up to 25% of the C20 rating so an 800 AH battery pack in an Anthem or Cornerstone could be charged at 200AH. For the two Magnum inverters the total charge capacity is 125 AH plus 100 AH for a potential total of 225 AH. If set to 100% rate of charge the batteries are being charged at 28% of the C20 rating which is a little high. This is why I recommend a 90% rate of charge setting in the Magnum inverter panel for an Anthem or Cornerstone. 90% gives you 202.5 AH max.
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Old 03-17-2017, 07:57 PM   #18
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Don thank you for your very detailed help...I haved learned a lot. This forum is a wonderful resource.


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David,

With the ME2012 set your charge rate to 60% (450AH battery bank X 13% = 58.5 AH). The rest of the setting stay the same as in the previous post.
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Old 03-18-2017, 01:38 PM   #19
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Don thank you for your very detailed help...I haved learned a lot. This forum is a wonderful resource.
David,

You are welcome, glad to help.
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Old 03-19-2017, 07:38 AM   #20
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Great Information, I have to check my settings.
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Old 03-19-2017, 03:26 PM   #21
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Great Information, I have to check my settings.
Careful, the settings given were only for those specific Trojan batteries with that specific battery bank size.
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Old 03-23-2017, 09:44 PM   #22
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What a resource!

Don

Thanks for sharing all of your knowledge with us mere mortals!
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Old 03-24-2017, 07:26 AM   #23
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Don,
Dumb question time....in your reply to Marc, you mentioned the BTS (battery temp sensor).
What/how exactly does this measure the battery temp and is it done numerically or with idiot lights? Is there a proper/safe temp range you need to be in before you start the charging process?
So much to learn and understand about batteries.....
Thanks.
Tom
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Old 03-24-2017, 01:14 PM   #24
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Don,
Dumb question time....in your reply to Marc, you mentioned the BTS (battery temp sensor).
What/how exactly does this measure the battery temp and is it done numerically or with idiot lights? Is there a proper/safe temp range you need to be in before you start the charging process?
So much to learn and understand about batteries.....
Thanks.
Tom
Tom,

On the Magnum remote panel it is shown numerically. Push the TECH button and temperatures comes up, push the round dial and the BTS is the first one shown. At 25C (77F) there is no compensation. Below this temperature the voltage increases and above this temperature the voltage decreases. The sensor at the batteries sits on a negative post. If you have two inverters there is one temp sensor on the top bank and one on the bottom bank.

Best to charge the batteries when they are cool but if it is a warm day the BTS will look after things for you and limit the charge voltage.
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Old 03-24-2017, 01:29 PM   #25
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Don, thanks.
Seems as though the batteries would rarely be at rest or at a temp that they could accept a full charge. I get what you are explaining now.

As others said, your knowledge on this is impressive.

I hope Entegra is paying attention too.

As a side note, We are going to go the used route on a Entegra Coach. Hence, trying to determine what we may upgrade to (battery-wise), if we add solar, etc...I've got a lot to consider and learn about. We are planning on more boon docking than on shore power.

This forum is invaluable. Thanks again!
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Old 03-24-2017, 04:37 PM   #26
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I may have missed it. But did anyone point out that battery voltage is the worst way of determining state of charge?
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Old 03-24-2017, 05:37 PM   #27
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I may have missed it. But did anyone point out that battery voltage is the worst way of determining state of charge?
Good point. Voltage is wildly inaccurate. That is why the use of a meter like the BMK is so helpful. Problem is, the AGS is triggered by voltage, so it operates with a fallacious trigger. The AGS should run off a BMK, not voltage.
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Old 03-24-2017, 05:52 PM   #28
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I may have missed it. But did anyone point out that battery voltage is the worst way of determining state of charge?
Yes, you are correct, battery voltage is not the best for determining state of charge. For flooded batteries an S.G. reading with a hydrometer would be much better however many of us on this forum have AGM batteries so we cannot check the S.G. I use a properly set up 3 stage charger and a Trimetric battery monitor to ensure my batteries are fully charged and when they are less than fully charged I know exactly what level they are at, no guess work involved.
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