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Old 05-10-2014, 09:15 PM   #61
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Heh...good you know now but I hope the 10 was a typo!! Never run your batts below 12.2V before you recharge them unless you wanna replace them like everready D cells!
Enjoy!!
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Old 05-12-2014, 12:43 PM   #62
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Anything for science! ;-). That was the low battery reading on the inverter, not what volts the batteries were actually at. While it is not recommended to take them down that far, Interstate does list 10.2 volts as the lowest. Thanks for the help!!
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Old 05-12-2014, 05:16 PM   #63
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Heh...science thanks you!
This might come in handy... left side is number of cycles...right side is % discharged.
10.2 is 100%. Science is your friend....LOL...All best!




Your next mission should you choose to accept it Mr. Phelps is to advise the group how long a 10.5V nominal charge will take to drop to 10.2V with a 5amp load. Science awaits your results!

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Old 05-17-2014, 06:30 PM   #64
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Follow up

Just finished installing the Battery Monitoring module for the Magnum 1212. Install was quite easy; mostly plug and play.

It took the system right at 20 hours to get an accurate reading on State of Charge. While waiting the display simply reads "Thinkin'" !!

Paid $170 for the kit (with shunt), but almost $60 additional for stuff they do NOT include.

Going to experiment/test it out over the next week or so, to determine exactly how much good it does for me. Initially, I think it will be a great asset.

Boowho??
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Old 05-17-2014, 10:37 PM   #65
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Ooof...that is quite a price to pay...what was the additional stuff that added up to so much? Kit price is in the ballpark with other quality monitors...only thing I had to get with my victron was a short negative cable to run from shunt to batt.
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Old 05-18-2014, 11:49 AM   #66
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Originally Posted by camaraderie View Post
Ooof...that is quite a price to pay...what was the additional stuff that added up to so much? Kit price is in the ballpark with other quality monitors...only thing I had to get with my victron was a short negative cable to run from shunt to batt.
Short cable same as you.... Then fuse holder, extra hook-up wire, phone splitter and cable, wire terminals, extra short cable (not really neccessary, but opted to improve my battery hook-ups a bit), some nuts and bolts (mounting hardware) plus a couple of other things I can't remember at the moment.

I have two output circuits of the battery stack; posts are so short the nuts would not screw all the way on with three lugs on them. After installing the shunt, I had only two lugs attached to the negative post instead of three. I decided to fix the positive post the same way, so that was maybe $15 of the extra cost.

They used to "nickel and dime you to death"; now it's $5 and $10 you to death.

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Old 05-21-2014, 10:50 PM   #67
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Follow up

After installing the BMK, I turned off the charger four days ago. Tonight, the SOC was standing at 81%. Disconnected the shore power and watched TV for an hour. SOC dropped to 76%.

So, looks like I used approx half of my stack capacity using the parameters stated above. The Magnum BMK is quite nice; among several of it's readouts is the total AH's that have been taken from the batts, since the stack was last disconnected. Could this be a guide as to how much service life is left in the stack??

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Old 05-23-2014, 08:11 AM   #68
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Originally Posted by boowho View Post
Just finished installing the Battery Monitoring module for the Magnum 1212. Install was quite easy; mostly plug and play.

It took the system right at 20 hours to get an accurate reading on State of Charge. While waiting the display simply reads "Thinkin'" !!

Paid $170 for the kit (with shunt), but almost $60 additional for stuff they do NOT include.

Going to experiment/test it out over the next week or so, to determine exactly how much good it does for me. Initially, I think it will be a great asset.

Boowho??
Boo; Your installing the Magnum BMK makes sense for you because you already have the Magnum ME-RC ($190) remote control installed which I believe that is needed before the BMK is installed. Also for sure the ME-RC gives a lot of Magnum control.

I would just like to point out to other readers that there is another more economical monitor for those that do not have the Magnum ME-RC. It is the VoltMinder Battery Sentry which has a programmable alarm setting which gives an audible alert. I described it in the following thread........

Tip 2 - Battery Sentry for boondocking
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Old 05-23-2014, 12:30 PM   #69
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Boo; Your installing the Magnum BMK makes sense for you because you already have the Magnum ME-RC ($190) remote control installed which I believe that is needed before the BMK is installed. Also for sure the ME-RC gives a lot of Magnum control.

I would just like to point out to other readers that there is another more economical monitor for those that do not have the Magnum ME-RC. It is the VoltMinder Battery Sentry which has a programmable alarm setting which gives an audible alert. I described it in the following thread........

Tip 2 - Battery Sentry for boondocking
Noted. Obviously, considering the cost of the Magnum accs, I probably would have gone a different direction myself, had I not already owned the rest of the Magnum system. I know others here have mentioned several alternatives in other threads.

And BTW, I paid (a year ago) $225 for my Magnum remote control. I hope their stuff is primo, cause their prices sure are!!!

Thanks again to everyone for ALL the great thoughts/ideas.

Boowho??
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Old 05-23-2014, 11:34 PM   #70
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Originally Posted by I-RV View Post
Boo; Your installing the Magnum BMK makes sense for you because you already have the Magnum ME-RC ($190) remote control installed which I believe that is needed before the BMK is installed. Also for sure the ME-RC gives a lot of Magnum control.

I would just like to point out to other readers that there is another more economical monitor for those that do not have the Magnum ME-RC. It is the VoltMinder Battery Sentry which has a programmable alarm setting which gives an audible alert. I described it in the following thread........

Tip 2 - Battery Sentry for boondocking
I think that unit is entirely unsuitable for boondocking use. ALL it shows is voltage which in no way corresponds to the actual condition and capacity of the batteries or PRESENT draw which you MUST know to plan properly.
The ONLY way to do this is with a device that has a shunt and measures amp use...remaining battery CAPACITY...TIME remaining at current amp use and actual state of charge as opposed to instantaneous and faulty voltage readings.
These types of monitors sell in the $150 range and the most popular are by Victron and Trimetric.
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