I'm planning on buying a Trimetric very shortly. We boondock almost exclusively. And while I've never run out of juice from my twin T105's, I would like to keep better tabs on the state of my batteries during our multi-day trips. Especially since we run the furnace a lot at nights -- I have 3 young 'uns under age of 10 to keep warm, not to mention a fairly cold-blooded wife.With all that being said, I'm curious to know what other TCers observe for electrical draws on your respective rigs.For example, how many AH does it take to load your TC (assuming you have remotely controlled electric jacks), starting with TC near ground level to being fully lowered into truck bed?

My philosophy of using a battery monitor is that it has one task, and that is to keep the batteries above 50% SOC (state of charge). Our situation is different and I am using a Victron rather than Trimetric. It is set to display SOC any other function may be entertaining but...

I use a three meter homemade DC MONITOR that monitors the DC VOLTAGE of my two selected BATTERY groups and the total DC CURRENT being pulled from the two selected Battery groups. The DC CURRENT meter also shows me how many DC AMPs is being demanded from the on-board Converter/Charger unit when charging the selected battery groups. This is wired into my DC SYSTEM like this...The only thing I would gain by using the TRIMETRIC model would be the settable DC ALARM when the DC VOLTAGE would drop to a particular DC Level. Presently I have to watch the DC MONITORING panel to determine when it is approaching 12.0VDC when being used.My DC MONITOR PANEL only provides me information as to the status of my battery groups so that I will not let them get below their approximately 50% charge state. When I see 12.0VDC on the selected Battery Group I will stop using the batteries until I get them charged back up to their 90% charge state.In my case this is all planned to happen around 8Am each morning when I am allowed to run my 2KW Honda Generator. Most all of the places we go to has generator run-time restrictions in place...Roy Ken

If you have deep pockets and do not camp in the cold consider LI chemistry batteries rather than lead acid.I am not a fan of amp hour counters, with the exception of the smartgauge because all the others drift out of calibration whereas the smartgauge gets more accurate over time.

Hi,I have a motorhome, and the jacks draw about 40 amps for only a few seconds to level it, so if run a full minute at 40 amps draw, it would still be less than 1 amp hour.The pump draws about 7 amps per hour, while pumping 2 GPM or 120 gallons. So water pump is also insignificant. (unless you have a 120 gallon tank, then it would be about 2 AH per day) What really consumes the power is the refrigerator, CO meter and propane leak detector. Together they draw 0.8 amps and 1.2 amps while the refrigerator is on. This works out to about 35 AH daily.If you are really concerned about the amp draw while loading the camper, try to plug it into the truck for as much time as possible, and the alternator will supply all the power, and charge the battery slowly at the same time.Chances are that the truck to camper battery wire is really tiny. Maybe #12 wire? Perhaps #14 wire? Upgrading to #8 wire and a twistlock 30 amp power plug (so it will not accidentally get connected to household power) will allow the alternator to fully charge those large golf cart batteries in less than a 5 hour drive. With #12 wire, the amp might move at 12 - 15 amps per hour, or a 10 hour drive can take them from 30% state of charge up to around 70% full. 10 HOURS!. My real recommendation is to install some solar panels. A pair of 140 watt solar panels will put out 8 amps to the batteries several hours per day, figure each one will put back about 40 AH daily with a PWM controller. Don't expect a lot more with the much more expensive MPPT controller, the amps back into the battery will only be about 5% more per day. With the solar panels, all trips will start out with full batteries, and you might use say 100 AH daily. Instead of discharging them over 2 days, you will take out 100 AH, put back 40 - 80, then take out 100 AH, and put back 40 - 80. You can keep doing this for several days before needing to run a generator.Another thing to help heat the camper is a Olympic Catalytic heater. It does not consume any 12 volt power, but you do need to leave a roof vent and kitchen window open a bit, just like when you are cooking with the stove.Have fun camping!Fred.

pianotuna wrote:If you have deep pockets and do not camp in the cold consider LI chemistry batteries rather than lead acid.I am not a fan of amp hour counters, with the exception of the smartgauge because all the others drift out of calibration whereas the smartgauge gets more accurate over time.Is this the meter that you prefer:http://www.defender.com/product3.jsp?path=-1%7C328%7C2289954%7C2289950&id=2388351Thanks

Trimetric owners: how many AH does it take to...

12 Replies

RoyB
Explorer II
Jan 20, 2016
I use a three meter homemade DC MONITOR that monitors the DC VOLTAGE of my two selected BATTERY groups and the total DC CURRENT being pulled from the two selected Battery groups. The DC CURRENT meter also shows me how many DC AMPs is being demanded from the on-board Converter/Charger unit when charging the selected battery groups.

This is wired into my DC SYSTEM like this...

The only thing I would gain by using the TRIMETRIC model would be the settable DC ALARM when the DC VOLTAGE would drop to a particular DC Level. Presently I have to watch the DC MONITORING panel to determine when it is approaching 12.0VDC when being used.

My DC MONITOR PANEL only provides me information as to the status of my battery groups so that I will not let them get below their approximately 50% charge state. When I see 12.0VDC on the selected Battery Group I will stop using the batteries until I get them charged back up to their 90% charge state.

In my case this is all planned to happen around 8Am each morning when I am allowed to run my 2KW Honda Generator. Most all of the places we go to has generator run-time restrictions in place...

Roy Ken
Shadow_Catcher
Explorer
Jan 20, 2016
My philosophy of using a battery monitor is that it has one task, and that is to keep the batteries above 50% SOC (state of charge). Our situation is different and I am using a Victron rather than Trimetric. It is set to display SOC any other function may be entertaining but...

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Trimetric owners: how many AH does it take to...

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