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Old 06-19-2013, 07:37 PM   #1
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Need your help with flat batteries..???

Hey All,

I want to ask all of your opinions....Last month I had my RV guy replace all of my batts. All new deep cycle batts placed in the RV. This last weekend I dry-camped in Syracuse. First night...great...on the Inverter...we watched TV on two sets...,I like my shows and he likes his....(on satellite) Watched for about two hours and then shut TVs down...We woke up, I started the gennie and made coffee and ran the gennie for 2 hours. I put the propane hot water heater on for showers and then shut it off.

Halfway thru the day, I put the furnace on for a little while because the temps were dropping. I ran the gennie and then shut it down. We left the rig with the inverter going but no power drawing. That night we watched TV again on the inverter. But.....sometime in the night I awoke to hear the furnace kicking on...I forgot to shut it down. I had no idea how long the furnace had been running but I jumped up and shut it down. The next morning I was able to start the gennie and we had full power to make coffee and make breakfast. I only ran the gennie for 1 hour before we left for the day.

In the evening, we came back to the RV and everything was dead. No Power at all. I tried to start the gennie and nothing...I was scared, but I started the engine for a few seconds and then was able to start the gennie. (I hate to start the engine when I am parked with leverlers down.....) We got a charge and then evrything ran as it should....

Now.....I am concerned that my new batteries may be defective. Maybe there is one that is not sparking as it should... I think that I should have had more of a charge with new batts. But maybe it was my fault leaving the furnace on all night????

Please tell me your opinions....

Faith
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Old 06-19-2013, 07:42 PM   #2
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It sounds like the batts are doing there job but the short charge cycle is not long enough to fully top them off or charge them how ever it might be said that's my thoughts.
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Old 06-19-2013, 07:44 PM   #3
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I don't think the batts are given enough time to reach a full charge.
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Old 06-19-2013, 07:49 PM   #4
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Was the furnace running such a big draw that it would deplete the batts???/

Faith
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Old 06-19-2013, 07:51 PM   #5
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On our rig our 8.0 Kw gen takes at least two hours to get an 85% charge on our 4 232 amp hr 6 volt deep cycle batteries. The inverter/charger can put out 100 amps to the batteries. It's not worth running the gen to get that last 15% of charge as that would take another 2 hours.
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Old 06-19-2013, 07:53 PM   #6
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It takes a few hours to fully charge a battery. Also when charging, a lower amp charge will help with a more complete charge. High amp charging may cause a false peak and the battery may not fully charge. The charger we have a work (about $900) will take about 2 hours to fully charge a partially drained battery. I have a charger at home I bought at a local retailer and it takes about 10 hours to fully charge a battery. It I capable of 12 amp charge but it will charge at a much lower rate than that on automatic. A solar charger may help during the days.
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Old 06-19-2013, 09:59 PM   #7
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The moral of this story is that you need to monitor your batteries or it is all guess work. You need to know the goesinta and the goesouta. Deep cycle battersw should not be taken below 50% state of charge if possible or it shortens their life. Two well accepted monitors are TriMetric Battery System | Bogart Engineering BMV-600S and BMV-602S - Victron Energy
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Old 06-20-2013, 10:08 AM   #8
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Quote:
Originally Posted by Shadowcatche View Post
The moral of this story is that you need to monitor your batteries or it is all guess work. You need to know the goesinta and the goesouta. Deep cycle battersw should not be taken below 50% state of charge if possible or it shortens their life. Two well accepted monitors are TriMetric Battery System | Bogart Engineering BMV-600S and BMV-602S - Victron Energy
, Concur. It is vital, when boondocking, to bring the battery's up to FULL charge (around 14.8 Volts) daily, and you need to know, positively, what is going on with them.

TriMetric is a very good first step.



Ed
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Old 06-23-2013, 08:01 AM   #9
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Do not need any special equipment. A standard digital voltmeter does the trick. Or maybe your Inverter/Charger has a readout. Search online for battery voltage state of charge. This will get you a chart on battery voltage = % charge. Monitor that. Making coffee Via electric = about 30amps DC. Microwave = dead battery in 15 to 20 minutes. Learn to use those items only with generator running. If you do not need the inverter, turn it off. It draws 4amps sitting their. Based on your inverter/charger (which you did not give make_model), it should have a 3 stage charge circuit. Bulk, absorption and float. To complete this cycle requires about 3 to 4 hours. Get the manual on your unit.
Can you run it for an hour only, YES, however within a few days let it run for the complete cycle.
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Old 06-23-2013, 09:53 AM   #10
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How many batteries and what size/type?

Agree - need to monitor batteries somehow - Tri-Metric is optimal, but voltage monitoring will let you know where you stand charge-wise. In between is something I this (I have one, works well). MidNite Solar MNBCMS Battery Capacity Meter

Furnace fan can be quite a power draw over time - many dry-campers install a catalytic heater (uses no electricity).
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Old 06-23-2013, 10:01 AM   #11
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Did your new batteries have a full charge on them when you had them installed? Sounds to me that you started off with low batteries.
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Old 06-24-2013, 05:31 PM   #12
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you also need to take into consideration what the temp was, it sounds like it is cold, if so , it is going to take twice as long to achive a proper charge.
good luck;
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Old 07-18-2013, 03:20 PM   #13
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Battery Mystery Solved,,,,I Hope

Hey All,

I just received a call from my RV tech. I dropped the RV there yesterday and he performed tests and he informed me that two of the four new house batts were defective. They are being swapped out tonight and then we will pick up our big baby tomorrow and hopefully....no more battery problems..... The battery company is sending out someone tonight with two new batteries. I requested a check on all four batteries before he left though......

I am amazed that two of the four batteries were defective, How often does this happen? I guess that I am clueless when it comes to defective batts. I am just glad that they found it.

Thank you all for your suggestions...

Faith in very hot and humid Massachusetts...
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Old 07-19-2013, 01:48 PM   #14
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Look up what type of Inverter/Charger you have installed in your rig. Make/Model, get the manual and read it. It will tell you what charging states you have.
Bulk, Absorption, Float and Equalizer are the normal 4 states. Included with this is how to set it up for your system, (if you have remote panel). However in the mean time, you need to measure your voltage, prior to starting your generator in the morning. This will give you a clue as to how long the generator should run. BUT the priority is ID your make/model of inverter/charger you have. The opposite side is, if you only have a converter then that is very different in charging your batteries. Hope this helps
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