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Old 07-15-2015, 04:54 AM   #21
smiller
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Default Re: Replacing OEM batteries with LiFePO4's

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Originally Posted by Peter Tourin View Post
You mean slide it out so you can get to the pot, but don't disconnect it - run it and turn the pot while measuring the voltage?
Not quite that easy I'm afraid. Basic steps are:

1. Remove AC and DC power from the unit.
2. Remove the top front panel (that covers AC breakers) and and disconnect AC and DC power leads to the charger unit.
3. Remove the charger unit and place on bench.
4. Drill out the rivets that attach the top cover.
5. Remove cover, pot is at rear of circuit board.
6. Apply AC power to the unit and set to desired DC voltage.
7. Reattach top cover with sheet metal screws and reassemble everything.

Sounds complicated but it's really only a 30 minute job. There is a large range of adjustability but I can't say for sure whether you can get up to 14.6 volts.


Also, if size is a consideration you might also look at the Iota DLS chargers which have a smaller form factor. They are heavy duty units that will provide rated output without breaking a sweat.

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Last edited by smiller; 07-15-2015 at 05:01 AM.
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Old 07-15-2015, 12:19 PM   #22
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Default Re: Replacing OEM batteries with LiFePO4's

I'll probably give that a try - I wonder if I could ring Parallax and find out how high they'd go...

As for the Iotas, the size is great and they are apparently more efficient than the PD's, as the PD7060AL (60A ouy) is rated at 1000W input draw while the DLS-75 is also rated at 1000W. But they're 13.6v out, 14.2 when jumped. Close - I wonder if they also have a voltage adjustment pot inside. Probably worth a phone call to them.
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Last edited by Peter Tourin; 07-15-2015 at 12:28 PM.
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Old 07-15-2015, 12:40 PM   #23
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Default Re: Replacing OEM batteries with LiFePO4's

The DLS models are voltage adjustable via a pot inside the unit. I know they will go to 14.6 because I have set mine to that (wanted higher absorption level setting .)

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Last edited by smiller; 07-15-2015 at 12:47 PM.
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Old 07-15-2015, 04:06 PM   #24
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Default Re: Replacing OEM batteries with LiFePO4's

If they need such high voltage from their charger what are you going to do when driving? Are you going to adjust the alternator output? How about solar, are there controllers yet that handle LiFePO4's? And freezing, has that been mentioned yet? I am following another board that has done the lithium conversion, their pack has little heaters that use some battery energy to keep the pack above freezing as that appears to be BAD for the chemistry. That seems like a drag, especially if you don't have solar. I can see a day when the RV is buried in snow and the pack uses up it's charge running the heaters and STILL freezes. Although snow is a great insulator, so perhaps you would save yourself the freezing temps. My Serenity has the batts outside in a hanging cage, so very exposed to the weather. I just put another set of flooded 6Vs in, I had hoped that some tech like you are experimenting with would be available by now so I could avoid the flooded. I do have solar and I am counting on keeping them charged and topped will allow them to last many years this time. Glad they are cheap, @$89

-Randy
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Old 07-15-2015, 04:12 PM   #25
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Default Re: Replacing OEM batteries with LiFePO4's

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If they need such high voltage from their charger what are you going to do when driving?
I would ask Smartbattery tech support if they feel 14.1 volts is adequate. If not then there are DC-DC converter systems that can provide a higher voltage while underway, but it would ne nice to avoid the extra hardware if possible.
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Old 07-15-2015, 05:43 PM   #26
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Default Re: Replacing OEM batteries with LiFePO4's

Checking it out with SmartBattery - I'll let you know.
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Old 07-15-2015, 06:15 PM   #27
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Default Re: Replacing OEM batteries with LiFePO4's

On the question of cold weather driving and camping and batteries comfort you have to consider insulating that battery box and somehow keep it warm (venting furnace?) .The good news is there is no worry about venting for non wet batteries with smart batteries or even gel banks.
So a nice airtight padded cell for the juice boxes.
I had a real issue with road salt and sand completely covering all my six back gels batteries in serious winter driving conditions.Keep those terminals clean!
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Old 07-15-2015, 07:56 PM   #28
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Default Re: Replacing OEM batteries with LiFePO4's

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Peter, same advice I give to everyone when the subject of charger/converters and inverters is raised. Talk to Randy at bestconverter.com. Click here to see his page about Lithium Ion charger/converters...
I followed Don Horner's advice & called Randy about our Parralax 7300 Converter/Charger & he recommended I go with the Parralax 7300 Series Upgrade Kit which I did.

Did not replace the stock Interstate Batteries yet, but plan to in another week once we return home. The current Interstates do not hold a charge long enough now after two years to even run the fan all night before getting down to low 12's which is at about the 50% discharge rate.

Here is the upgrade kit info for the 7300 Series Parralax: http://www.bestconverter.com/Magnete...-Kit_c_64.html

Or go to Best Converters & click on the first item on the left for the upgrade if interested.
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Old 07-15-2015, 08:29 PM   #29
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Default Re: Replacing OEM batteries with LiFePO4's

Lithium batteries take different charging voltage than do standard or AGM batteries, so I can't use that upgrade. But even for standard and AGM's, the stock charger in the Parallax 7300 isn't wonderful, and that upgrade kit gives you a good multi-mode charger. So you may want to consider it when you get new batteries - but it won't help me with lithium batteries.
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Old 07-16-2015, 03:58 PM   #30
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Default Re: Replacing OEM batteries with LiFePO4's

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Originally Posted by Unity Traveler View Post
he recommended I go with the Parralax 7300 Series Upgrade Kit
I was sorry that I did this upgrade because I now have the solar charge system that does all that the Parallax does (3-stage and eq). I only ever need the converter when I am at a campsite. If I had instead done one of those DC-DC 3-stage converters I could have gotten the better charge from both my converter AND the alternator...



-Randy
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