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Old 05-24-2013, 06:23 PM   #1
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Magnum Interter/Charger

On the control panel for this unit there are three lights, labeled Bulk, Absorb and Float.

From what I can tell, these represent several levels or charging rate. Bulk being the highest rate and float the lowest.

The float on mine is always illuminated, indicating to me (at least) that my bats are always being charged.

Could this be the reason that my bats are out-gassing, releasing acid and generally causing a mess in the compartment most of the time?

I asked Magnum support about this in an email, but they were pretty much no help at all. I also asked them which terminal (on the attached diagram) the temperature sensor should go on and no help there either.

Herk? Anyone?

Boowho??
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Old 05-24-2013, 07:13 PM   #2
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Need to check the voltages when the bats are on float. Depending on the type of battery (flooded, gel or AGM) the float voltage should be around 13.3 to 13.7 volts. If its higher than that, your batteries are being fried and you need a new charges. The temperature sensor is only important during the bulk and absorption stages, as these periods are very dependent on temperature.
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Old 05-24-2013, 07:32 PM   #3
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temp sensor goes on the negative post on the far top right (same place as where the negative cable of the charger is connected). as garbonz mentioned, it's more critical during the heavier charging stages.

float is the trickle charge state. since your batteries are constantly being used by all the misc little devices inside, it'll constantly sip at the batteries and the magnum charger will know this so it keeps trickling in more juice...

where is the temp sensor now? my factory stock install was in the wrong location. as were the rest of my cables. it's wired to work, but was not correct. one "12v" (set of 6v batteries) were more heavily charged/drained by the magnum inverter than the other set. after changing the positive cable, my house 12v system now drains evenly across the bank. i need to measure and order the correct set of cables to fix this so i don't overuse and abuse the batteries.
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Old 05-24-2013, 07:37 PM   #4
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Boowho's appears to be correctly wired to me.
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Old 05-24-2013, 08:38 PM   #5
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Quote:
Originally Posted by Himcules View Post
temp sensor goes on the negative post on the far top right (same place as where the negative cable of the charger is connected)
OK, to be clear...... Which neg post? I assume either 1 or 2??

So based upon the responses, it appears that the float light will always be on as long as juice is being consumed by 12v devices in the coach.

I've had the charger disabled for a couple of days and the bats are staying clean. I will check the voltages to see if they are in the range mentioned by garbonz.

One reason I think FR may mis-wire the bats is that the posts on the bats I have are extremely short to have 3 different cables attached. The nut doesn't even go all the way on.

By mis-wiring, the max number of cables attached to any post is 2, so the nut goes on properly..... my guess is that the installer just takes the easy way out.


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Old 05-24-2013, 08:51 PM   #6
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Quote:
Originally Posted by boowho View Post
OK, to be clear...... Which neg post? I assume either 1 or 2??

So based upon the responses, it appears that the float light will always be on as long as juice is being consumed by 12v devices in the coach.

I've had the charger disabled for a couple of days and the bats are staying clean. I will check the voltages to see if they are in the range mentioned by garbonz.


Boowho??
For the temp sensor, it don't matter which negative pole you use in your properly wire system, each will see the same temperatures.

You will need to hook up the charger again and let it go to float to see if it is overcharging.. If you are seeing signs of gassing ( not including the Mexican dinner last night), then that is a pretty clear sign that the charger is over charging at float IMO.
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Old 05-24-2013, 11:26 PM   #7
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per page 16 of the installation manual:
negative wire AND temp sensor are on the same post at the FIRST battery in the string. positive wire on the positive post of the LAST battery in the string.

so if your berkshire is like mine and the inverter is in the bay to the right of your diagram, then from the MM1212 inverter, you connect to post #2 BOTH the negative line and the battery sensor. on the positive post of where you have #3, is where your positive connection needs to be (not to the post you labeled as #3).

Quote:
Originally Posted by boowho View Post
...
One reason I think FR may mis-wire the bats is that the posts on the bats I have are extremely short to have 3 different cables attached. The nut doesn't even go all the way on.

By mis-wiring, the max number of cables attached to any post is 2, so the nut goes on properly..... my guess is that the installer just takes the easy way out.

Boowho??
you can get 3 on the same post if you remove the washer, but it is a tight fit. i had to do that to change my wiring to correct it.

i don't think the installer was taking the easy way out, i think he misunderstood how battery systems work and tried to wire in a clean and short matter. it took effort to wire the batteries in my coach, just was the wrong way to do it..
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Old 05-25-2013, 09:46 AM   #8
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Boowho,

Certainly lots of great advice above - many very knowledgable folks that have saved my bacon several times. The battery issue you're experiencing finally drove me to swap Magnum controllers. I had new batteries installed at purchase and they were getting thrashed - and the slide was becoming a total mess. I swapped out the original Magnum controller with the one pictured below - which allows you to set the charge rate. I set it lower and have not had an issue since. The batteries take slightly longer to charge but you can input many of these parameters and then let the controller do its thing.
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Old 05-25-2013, 11:08 AM   #9
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I have been watching this thread as I have corrosion problems also. I like the idea of the control panel upgrade. Where can I find that? Part number? And easy install?? I agree if I can change the rate of charge that should fix this problem.
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Old 05-25-2013, 11:17 AM   #10
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Quote:
Originally Posted by Himcules View Post
per page 16 of the installation manual:
negative wire AND temp sensor are on the same post at the FIRST battery in the string. positive wire on the positive post of the LAST battery in the string.

so if your berkshire is like mine and the inverter is in the bay to the right of your diagram, then from the MM1212 inverter, you connect to post #2 BOTH the negative line and the battery sensor. on the positive post of where you have #3, is where your positive connection needs to be (not to the post you labeled as #3).



you can get 3 on the same post if you remove the washer, but it is a tight fit. i had to do that to change my wiring to correct it.

i don't think the installer was taking the easy way out, i think he misunderstood how battery systems work and tried to wire in a clean and short matter. it took effort to wire the batteries in my coach, just was the wrong way to do it..
Getting more confused...... I obviously have the high amp wires (the green ones in my diagram). I have the temperature sensor. Finally I have a very light gauge wire (actually two wires bundled together) that is black. This is all the wires I have. I don't know what this "light gauge" black wire is for, but I'm going to put it and the temp sensor on post 2 of my diagram.

Thanks Himc.....

Boowho??
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