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  Topic Review (Newest First)
08-21-2016 06:15 PM
Re: Cristec Battery Charger Default vs AGM Caution

OK, I try to formulate it better, but I'm no expert.

I measured with the voltage (battery) panel of my SO379, but also the solar charger shows the battery voltage, and they are in line with each other.

What I did:
I changed battery from a 260 Ah AGM to this Varta Deepcycle AGM.
After a full load (16h) I expect to see 12.8V battery (on the electric panel), but I never see more than 12.5V (few minutes after removing the shore power, or after stopping the engine. As far as I understand (read) this indicates that the battery is only loaded to 80% of capacity, not 100%. After that it seems that the battery works as expected (after 12h with fridge running I see 12.0).

The same charger and same settings worked fine with the "old" AGM battery, there it took hours (typically only fridge running) before the voltage went down to 12.7 or 12.6, therefore I don't think that there is a malfunction of the charger, rather a problem of the battery or the charger settings.

- Is it possible that the battery has a defect that shows that behaviour (only load up to 80% of capacity)?
- The battery dealer told me on the phone that this deepcycle likes to b loaded with 14.8V, the manual of cristec shows only 14.4V (down to 13.6) for the AGM program, I did not see any change after changing the setting of the CPS3 from 'lead acid' to 'AGM'. Also if I check the website of Fillippi, their charger also uses the same load voltage (14.4 boost, the 13.x, never uses a 14.8), is it possible that the Cristec charger cannot handle this deepcycle battery, if yes, does anybody know which charger can load this battery (in which program);
08-17-2016 06:39 AM
Re: Cristec Battery Charger Default vs AGM Caution

Originally Posted by Wolfgang68 View Post
....I can only load it up to 12,5V....
I think you'll get a better answer, if you explain what this means and how you measured it.
08-17-2016 02:36 AM
Re: Cristec Battery Charger Default vs AGM Caution

I'm using the Varta AGM deepcycle (LAD 210) with that charger, but I can only load it up to 12,5V, according to my dealer it should be loaded with 14.8V for a 100% load. Can I do that with this charger, or did I buy the wrong battery?
05-24-2016 04:27 AM
jack daniels marine
Re: Cristec Battery Charger Default vs AGM Caution

remote LEDs for CPS3OEM :

does anyone know if port K17, shown in the photo above from 06.06.2014, is for connecting remote LEDs?
My CPS3OEM 25A is located under the deck, I have no visable indication if shore power fails, or when the batteries are fully charged.

A cheap and easy solution is a remote LED from either the CPS3OEM or the SI-ACR. visable from outside the boat or keyside.
02-15-2015 05:52 AM
Re: Cristec Battery Charger Default vs AGM Caution

I have 4 Exide Group 31's being charged by a single 60amps CPS3, and a single 80amp alternator. I don't think you have a problem. The specs on charging the gels were similar to a conventional battery. The AGM's do have the 'Capability' of being charged a rate of about 1/3 their capacity, but it's not required. In my case I could really use a bigger alternator, but I am about to install 540watts of solar. I may still install a serpentine kit and a 160amp alternator.

One issue I have with the Cristecs for my house bank is ventilation, it puts out a great deal of heat and is tucked under a rear birth. I may install a vent, and cabinet fan.
02-14-2015 11:45 PM
Re: Cristec Battery Charger Default vs AGM Caution


I have just read all of the other threads on this forum and am a little concerned that I have bought the wrong batteries!

The boat is a 2 year old Lagoon 400 Catarmaran and the cooked gel batteries were a big suprise as they were installed OEM. Previously we had a 480AH Gel array (Exide ES1150 x4) and I took the caps off after removing them to see a lot of gaps in the gel.

The only reason I bought AGMs is because I thought they were similar to Gels (what the battery wholesaler told me) but cheaper and more easily available in my location.

For charging we have 2x Hitachi 80 Amp alternators but more commonly we use two Cristec CPS3 OEM chargers at 40 amps each. We also have a solar array that puts out about 20A peak and is regulated by an OEM french Solar charge regulator which does not have any optional settings.

I have just purchased 3 Deka 8A4Ds and am a bit concerned that I do not have the charging capacity to charge them efficiently. Often when we are motor sailing we only have one engine on and it sounds like at 80A the alternators could get very hot. The Cristec chargers will also output a maximum of 80A but at least are better regulated.

I could have got gels in the same size (little less capacity) for a couple of hundred bucks more and could possibly still change them as I haven't yet installed them.

Any advice appreciated

02-14-2015 09:21 PM
Re: Cristec Battery Charger Default vs AGM Caution

Thanks Maine Sail,

Useful information. Yes I have Deka Intimidator AGMs but I do not have a remote temp sensor and am not sure if my exact model of charger can accommodate one or not as I do not have the manual and there is no obvious "Temp' input terminal. Without temperature compensation I presume that the 14.4V setting is deigned to be conservative and avoid overcharging?

Like I said in my previous post the charger appears to have three pots which I am sure can only be for fine tuning the voltages the problem is that I am not sure what each of them do as the charger also has a designated start battery output.

I have just removed a set of Gels that were two years old and had been cooked by overcharging (gaps in the gel matrix from drying out). I suspect the Solar array or the Engine Alternators are the cause but it is interesting that you comment that "this charger will not charge gels very well" what makes you say that?


02-14-2015 03:37 PM
Maine Sail
Re: Cristec Battery Charger Default vs AGM Caution

If you are using Deka AGM batteries, and your charger has a remote temp sensor, 14.6V will yield a healthier battery and help to limit sulfation.

Unfortunately "dip switch" chargers rarely if ever give good options for charging. Not all batteries will fit into a dip switch box..

There are many batteries that charger won't charge properly including GEL, TPPL AGM's and orbital batteries as well as golf cart and many deep cycle batteries....
02-14-2015 03:34 PM
Re: Cristec Battery Charger Default vs AGM Caution

BTW does the manual say anything about adjusting the potentiometers RV1, RV4 and RV5? Are these for fine tuning of the voltages?
02-14-2015 03:32 PM
Re: Cristec Battery Charger Default vs AGM Caution

Thanks Missing You,

I have just had exactly the same problem - swapped out Gel batteries for AGMs and got excited when I saw the manuals on Cristecs Website only to open up the chargers and find out that I had OEM versions not the retail so no helpful 16way selector wheel. With the copy of the manual page you gave I now know what to set my dip switches too!

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