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Old 03-28-2016, 04:15 PM   #1
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Battery Swap from 12v Deep Cycle to 2x L16 for more amp hours

Yesterday I paid the coach batteries some love. We had 5x 12v 65Ahr batteries for the coach batteries. They were long past their prime and could rarely run the heater fan requirements at night for more than four hours. After a bit of research I decided to replace them with 2x Trojan L16 6V batteries in series for a total of 467Ahr. Sadly this takes up most of the Storage space I had up front for the battery box and those two batteries. There is definitely more cubic feet available than before, but it's not a nice open flat area like it previously was. I have a manual battery cutoff installed on the positive side going to the coach, but need to install one for the line connecting the batteries in series.

Next step is to get a Xantrex Charger/inverter and all accessories to run A/C off the batteries with the inverter. After that will add solar and the system upgrades will be done.

-Vycan
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Old 03-28-2016, 04:36 PM   #2
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[QUOTE=Vycan;1768754]Yesterday I paid the coach batteries some love. We had 5x 12v 65Ahr batteries for the coach batteries. They were long past their prime and could rarely run the heater fan requirements at night for more than four hours. After a bit of research I decided to replace them with 2x Trojan L16 6V batteries in series for a total of 467Ahr. Sadly this takes up most of the Storage space I had up front for the battery box and those two batteries. There is definitely more cubic feet available than before, but it's not a nice open flat area like it previously was. I have a manual battery cutoff installed on the positive side going to the coach, but need to install one for the line connecting the batteries in series.



Next step is to get a Xantrex Charger/inverter and all accessories to run A/C off the batteries with the inverter. After that will add solar and the system upgrades will be done.



-

If I may interject, I would definitely suggest either a Magnum or Victron inverter/ charger based on many years of watching Xantrex units die, only to be told that they are NOT repairable, and installing over 100 Magnum units with no issues.

Magnums are US made with a 3 year warranty and a large network of service centers. Victron 'owns' the marine industry when it comes to that type of device. Excellent quality there!

You can't go wrong with either.


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Old 03-28-2016, 06:02 PM   #3
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Not to throw a fly into the ointment, but if you are planning on running a roof mounted AC unit off an inverter it will not provide favorable results...you might get 20 mins of run time on the AC unit but that is about it. To prove my point if you take the volts times amps approach to this idea you will see that it is a tremendous load on the battery or batteries. Even with the engine running most alternators will put out their rated amperage at a higher RPM. The reason I know this is because I tried it on my tool truck about 12 years ago. I kept going through Onan 6500 generators every two years, I wanted to install an Onan 7500 quiet diesel but the cost with a custom made stainless steel box was close to 12,000.00 which I didn't have a the time. The inverter idea sounded to be a more reasonable idea but I wish I had not wasted the money. I now have the stainless box with the quiet diesel installed in my tool truck for ten years and the problem is solved. Regards, Bob
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Old 03-28-2016, 06:39 PM   #4
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Not to throw a fly into the ointment, but if you are planning on running a roof mounted AC unit off an inverter it will not provide favorable results...you might get 20 mins of run time on the AC unit but that is about it. To prove my point if you take the volts times amps approach to this idea you will see that it is a tremendous load on the battery or batteries. Even with the engine running most alternators will put out their rated amperage at a higher RPM. The reason I know this is because I tried it on my tool truck about 12 years ago. I kept going through Onan 6500 generators every two years, I wanted to install an Onan 7500 quiet diesel but the cost with a custom made stainless steel box was close to 12,000.00 which I didn't have a the time. The inverter idea sounded to be a more reasonable idea but I wish I had not wasted the money. I now have the stainless box with the quiet diesel installed in my tool truck for ten years and the problem is solved. Regards, Bob
Actually, you CAN operate a roof A/C solely from batteries and inverter…..as long as you choose the RIGHT components!

I recently finished a new 2016 Airstream Interstate Grand Tour with an 800 amp/hour lithium battery bank, Magnum 3000 hybrid inverter charger and 400 watt solar array. The owner can run his roof A/C for over 5 hours simply with the lithium battery, solar and inverter……..and NO GENERATOR!

If the engine is running (driving down the road) the engine alternator will contribute a substantial amount of amperage to the lithiums thru the BIM system in the Interstate, to the tune of approx. 50-60 amps (as evidenced by the reading from the iPN-PRO battery monitor) from the engine's 220 amp alternator that will further extend the A/C run time.

Lead batteries will show extreme voltage sag when under such a large load (140 amps +) of a roof A/C and are subject to Peukert's Law which details the loss of battery capacity for large load situations. Lithiums show almost no voltage sag, have no Peukert losses and will easily start and run large loads like this.

This is the first Intertstate I have done with such a large electrical capacity, and it was very gratifying to see just how much is possible with the newly available technology.
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Old 03-29-2016, 08:02 AM   #5
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OK, I agree that with the new technology available that was not available when I did my install it is possible to get 5 hours of run time. My needs were all day, plus return on investment for an 800 amp/hour lithium battery bank $$$ Magnum 3000 hybrid inverter $$$, and a 400 watt solar array just to run the AC for 5 hours seems a little much. The generator appears to be the way to go.
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Old 03-29-2016, 12:34 PM   #6
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Of course! Some folks have reasons that override generator use. 'Mine is not to question why'. ......... :-))


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Old 03-29-2016, 10:20 PM   #7
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Lewster, I am curious. Are you able to share what the total cost of a system like that runs? Not that I am able to afford a system yet... but how cool would that be!
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Old 03-29-2016, 11:01 PM   #8
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Also, do you have a link or info on the battery?
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Old 03-30-2016, 07:12 AM   #9
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Lewster, I am curious. Are you able to share what the total cost of a system like that runs? Not that I am able to afford a system yet... but how cool would that be!
Sorry, but I don't discuss pricing on the open Forums few site rules. Please PM me for more information.

Thanks!
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Old 03-30-2016, 07:13 AM   #10
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Also, do you have a link or info on the battery?
Here you go: http://www.amsolarrv.com/lithium/
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Old 03-31-2016, 10:14 PM   #11
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Looks like the max current spec is for a very short instantaneous current.

The steady discharge number is really the maximum working current of the BMS. Did I get that correctly?

Thanks for sharing.
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Old 03-31-2016, 11:25 PM   #12
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Just out of curiosity, would a capacitor (such as one used in car stereo applications) be of any benefit to the system described above? It seems the biggest amp load is when the compressor kicks in initially, then tapers off.....


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Old 04-01-2016, 06:48 AM   #13
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Just out of curiosity, would a capacitor (such as one used in car stereo applications) be of any benefit to the system described above? It seems the biggest amp load is when the compressor kicks in initially, then tapers off.....


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I have not worked with capacitors for over 50 years (wow, I'm OLD!) but we used to use them for an amperage blast when building early-tech ruby crystal pulse LASERs.

Probably could design a system that would accommodate them, but would take a bit of research and lots of experimentation.

When the compressor starts in one of these systems, the battery monitors usually read well in excess of 150 amps DC for the transient.

Interesting thought.
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Old 04-01-2016, 08:21 AM   #14
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Here is a video that covers it somewhat.

https://youtu.be/B0rZY5uotKI
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