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Guest dual charger

 
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BBlalock



Joined: 31 Jan 2017
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City/Region: Ocean/ICW
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C-Dory Model: 25 Cruiser
Vessel Name: Finale
PostPosted: Tue Nov 23, 2021 10:53 am    Post subject: Guest dual charger Reply with quote

I have 2 batteries and the original Guest charger. I think it is killing my house batt. How do I test to see if the Guest is sending too much too long to the house battery?
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Barry Rietz



Joined: 21 Jun 2006
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City/Region: Sierra Vista
State or Province: AZ
PostPosted: Tue Nov 23, 2021 12:01 pm    Post subject: Battery Charging Reply with quote

BB, Assuming the Guest "dual" charge system is operating correctly, you might check the age of the house battery. Once sulphated, the battery would continue to draw current and never reach the full charge state.
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BBlalock



Joined: 31 Jan 2017
Posts: 107
City/Region: Ocean/ICW
State or Province: NC
C-Dory Year: 2013
C-Dory Model: 25 Cruiser
Vessel Name: Finale
PostPosted: Tue Nov 23, 2021 1:33 pm    Post subject: Reply with quote

Sorry, I should have said I recently replaced that battery. Both are 24 Series. I replaced both maybe in May and kept having charge issues with the house. I replaced that one at least 1 time since that. No problem with the start one. As you can tell my Guest is from 2012.
I'm just wondering if I should be able to watch my Yamaha system meter to see if it is cooking the battery. After I have been running a long time shouldn't the charge show maybe 13 instead of 14+?
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Hunkydory



Joined: 28 Mar 2005
Posts: 2451
City/Region: Cokeville, Wyoming
State or Province: WY
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PostPosted: Tue Nov 23, 2021 2:03 pm    Post subject: Reply with quote

I use size 24 batteries, that can have either one or both be used for the house & also a dual Guest charger. The charger starts charging at +14 v, but once they are charged it maintains closer to 13 v.

Jay

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thataway



Joined: 02 Nov 2003
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City/Region: Pensacola
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PostPosted: Tue Nov 23, 2021 4:14 pm    Post subject: Reply with quote

Unfortunately the guest chargers are not "smart chargers". A smart charger will sample the batteries' resting state voltage, and only turn on if there is a low battery (Less than 12.6 volts for instance). Ideally one would run the guest type of charger after they are through with the boat, (outboards generally don't keep the charge up to 100%). Then the battery would be turned off.

Ideally a battery charger should come only a few hours a day. One way to affect this is to use a timer on the power input into the boat. (Or buy a smart charger--which are for the most part more expensive.). This may be the best course if you are leaving the boat where it may get water in the cockpit and the battery must be constantly maintained to be sure that the bilge pump is suppled with adequate 12 volt power.

If there are no parasitic drains (such as a radio, voltage charge relay or GPS memory), then the battery should not loose it charge except thru a minimal natural attrition of about 4% of charge a week. For example my battery on the Caracal Cat is turned off between uses, and even after several months, the battery is at a state to start the outboard easily. Generally I'll put a charger on one day a month.

AGM batteries have a lower self discharge rate of 1 to 2% a month, and the LI batteries are even lower than that.

I like to measure the state of charge with a Victron 702 or 712 meter. However when I was experimenting with a cheaper set up to use liFePO4 batteries in a SUV or truck for a cross country trip to power a chest freezer, I found this Battery monitor for about $42/. There cheaper ones out there, but I have not tried them (some require a manual reset and are fine for one experiment, but not for continuous use.)

Also Victron has a "smart Shunt" which is considerably less than the 712 monitor. This relies on a smart phone to read the information of state of charge. amps in and out, and voltage.

These monitors tell you not only the voltage, but the state of charge, amps in and out etc.

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Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
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BBlalock



Joined: 31 Jan 2017
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City/Region: Ocean/ICW
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C-Dory Year: 2013
C-Dory Model: 25 Cruiser
Vessel Name: Finale
PostPosted: Tue Nov 30, 2021 9:50 am    Post subject: Reply with quote

So it appears I can test the Guest by using my smart charger to get the battery up to 100%. Then plug in power to the boat and check to see if the Guest drops the voltage to storage amount. If my meter shows 13+ across the terminals then the Guest is cooking the house battery?
I'm planning to replace that 9 year old unit anyway but want to make sure it is the problem first.
When I bought Finale I was told the Guest would check the start battery first and charge if necessary then move on to the house and charge if necessary and then go into storage mode. It sounds like you guys are saying that isn't correct. Am I right on that? CoolSmile
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kaelc



Joined: 19 Jul 2017
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PostPosted: Tue Nov 30, 2021 11:36 am    Post subject: Reply with quote

My guest which is likely a 2007 shows when it is charging and maintaining for both batteries. I believe it does both simultaneously. Yes I think the best way to test is when it goes into the "green" light charged mode is to check to see if its in a maintain or a charge state. Hope you get it figured out.
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BBlalock



Joined: 31 Jan 2017
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PostPosted: Tue Nov 30, 2021 3:27 pm    Post subject: Reply with quote

I'm going to replace it for sure. Just like knowing if I am accomplishing anything while replacing.
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hardee



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PostPosted: Tue Nov 30, 2021 6:14 pm    Post subject: Reply with quote

Quote:
"I have 2 batteries and the original Guest charger. . . . "


And I do too, although I have not used the Guest in about 10 years or more. In storage I use a small BatteryMinder (brand) trickle charger for each battery. They do a "desulfating" cycle every so many cycles. I don't think they are smart chargers (probably for sure not) but my last batteries lasted 6 years and were still 90 - 95 percent when I changed them out. (I have been using them on the boat batteries, the Motorcycle and the truck or car for about 10 years. Have not replaced the car battery yet. Only have had the truck for a couple years and it had a new battery when I got it.

I have considered taking the Battery Minders with me to use IF I go into a marina just for topping off, But I do that so seldom, and for such short times that it has not been an issue.

I would like to go to a new, smart charger but everything I have seen needs to go into a non exposed environment --- instead of under the splashwell.

Oh, the batteries are FLA Interstate RV Marine deep cycle.

Harvey
SleepyC Moon


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ssobol



Joined: 27 Oct 2012
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PostPosted: Tue Nov 30, 2021 10:16 pm    Post subject: Reply with quote

hardee wrote:
... I would like to go to a new, smart charger but everything I have seen needs to go into a non exposed environment --- instead of under the splashwell. ...


I have a ProMariner ProNautic 1215P charger. Seems to be pretty capable. The company also makes chargers that can go in wet areas.
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T.R. Bauer



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PostPosted: Wed Dec 01, 2021 8:53 am    Post subject: Reply with quote

I have killed, and known many more people, that have killed a battery with the best of intentions. Old chargers generally give too many amps to a battery and never really shut off. The batteries eventually get tired of that, run low on water, crystallization occurs in the cells, and then they are goners. I have a charger like that in my motorhome. If that is what you're dealing with, then once month charging is probably enough, that is unless you have a bunch of stuff taking power. In the boat, I just turn the batteries off and walk away because I don't have anything that can't shut off. New multistage stuff is far better tech.
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jrassier



Joined: 11 Oct 2008
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PostPosted: Thu Dec 02, 2021 8:24 am    Post subject: Reply with quote

I have used the Shunt Bob mentions for one season (AiLi-Voltmeter-Ammeter) So far it has preformed well monitoring SOC on a single 100Ah LiFePo4 battery It is accurate to .01 V compared with readings taken with a Fluke 87 multi meter.
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