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post #1 of 8 Old 07-17-2013 Thread Starter
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Old voltage regulator with an AGM battery

I've installed new AGM batteries as well as a Xantrex Smart charger.
I'm concerned that the voltage regulator on my 1988 35 hp Yanmar is not suitable for the AGM's.

Could this be true? Should I be replacing this older regulator with a smart regulator? Sometimes I motor 6 or 7 hours so I'd be concerned that I am overcharging my batteries.
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post #2 of 8 Old 07-17-2013
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Re: Old voltage regulator with an AGM battery

A good possibility...

The West Advisor: Battery Charging

..a good source referrence for charging requirements


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post #3 of 8 Old 07-17-2013
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Re: Old voltage regulator with an AGM battery

I just installed 2 new AGM batteries in Zen Again; I'll never charge them with the engine.

I have a solar charger (I'm on a mooring) and a portable 110VAC charger for when power is available. They both have options for 'sealed battery'.

I think the high amp output from my Honda outboard would overcharge my new batteries.

Ken

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post #4 of 8 Old 07-17-2013
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Re: Old voltage regulator with an AGM battery

Quote:
Originally Posted by mondofromredondo View Post
I've installed new AGM batteries as well as a Xantrex Smart charger.
I'm concerned that the voltage regulator on my 1988 35 hp Yanmar is not suitable for the AGM's.

Could this be true? Should I be replacing this older regulator with a smart regulator? Sometimes I motor 6 or 7 hours so I'd be concerned that I am overcharging my batteries.

What are the voltages you are seeing at the batteries:

Battery voltage just after start up?

Battery voltage after 30 minutes under loaded charging?

Battery voltage after one hour under loaded charging?

Battery voltage after two hours under loaded charging?

Battery voltage when the bank is known 100% full?

Most of the Hitachi alts temp compensate and reduce voltage as they heat up. This tends to lead to chronic under charging, not over charging. Monitor your voltage at the batteries under the situations above and let us know what you find.

Any factory alt where the voltage regulator reduces the voltage based on alternator temperature, such as many of the Hitachi alternators found on Yanmar engines, is one that is not doing you much good trying to charge a large or demanding bank like AGM batteries.

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post #5 of 8 Old 07-18-2013
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Re: Old voltage regulator with an AGM battery

Quote:
Originally Posted by aa3jy View Post

The West Advisor: Battery Charging

..a good source referrence for charging requirements
Looking at the WM site, it seems like I should be using the 'flooded' option on my solar charge controller for AGM batteries. Looks like 'sealed' (the only other choice) is going to undercharge them.

Ken

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Re: Old voltage regulator with an AGM battery

Darn.*

I went to the Morningstar website. The sealed mode (14.1V) will undercharge my AGMs compared to the flooded mode (14.4V); but if I pick flooded, the controller will do an equalizing charge (14.9V) which the WM site says NOT to do.

Will an equalizing charge of 14.9V for 3 hours every 28 days hurt my batteries more than be chronically undercharged?


*Mondo, sorry for the thread hijack; I like everything to be about me.

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Re: Old voltage regulator with an AGM battery

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Originally Posted by CarbonSink62 View Post
Darn.*

I went to the Morningstar website. The sealed mode (14.1V) will undercharge my AGMs compared to the flooded mode (14.4V); but if I pick flooded, the controller will do an equalizing charge (14.9V) which the WM site says NOT to do.

Will an equalizing charge of 14.9V for 3 hours every 28 days hurt my batteries more than be chronically undercharged?


*Mondo, sorry for the thread hijack; I like everything to be about me.
What brand of AGM...? Lifeline are the only ones that can be equalized however this should only be done when absolutely necessary. Many of the better Morningstar controllers allow custom programing, which model? I would choose the 14.1 mode for your AGM's then make it up with the OB alt or see if you can turn off auto EQ or do a custom program...

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post #8 of 8 Old 07-22-2013
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Re: Old voltage regulator with an AGM battery

Thanks, Maine Sail.

I have 2 West Marine AGM batts (group 24) connected as one 12V bank.

I have a Morningstar SunSaver 10 controller.

The Morningstar site FAQ says that the controller cannot be programmed to omit the auto EQ; it's the cheapest one they make. I got 15 years out of the last one and turned around and got another one (same solar cells, those things last!). I guess I should have shopped around.

So, on my next trip out, I'll put the controller back to 'sealed' and it will charge at 14.1 w/o an EQ. My Honda puts out 14.55. How often would I need to charge them with that? Once a month? for an hour or two?

Ken

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