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Old 09-02-2015, 09:41 PM   #29
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Galveston , Texas
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Our 2013 Interstate has a Magnum inverter/charger. The owner's manual states there is a "battery temperature sensor". Does anyone know if Airstream hooks this up in their installation? We did not notice an additional wire on either of the batteries, so it makes us think our AI isn't using this temperature information. Could this cause the battery to be overcharged in our hot Texas weather?
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Old 09-02-2015, 10:01 PM   #30
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Yep!

The charging level for Lifeline batteries is 14.2-14.4VDC for bulk/absorb charge and 13.2-13.4 VDC for float charge AT 77 deg. F.

As temperatures increase, the required charging set points drop. I don't have the temperature tables in front if me, but the Magnum will assume a 77 deg. F environment with no temp sensor in place.


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Old 08-08-2016, 09:11 AM   #31
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Follow up question re: solar PLUS lithium:

We're trading in our Interstate for a Winn/Itaska Navion (pause for incoming ) It has no solar so I'm going to have 3-400w installed by an authorized guy. The vehicle comes with a Progressive Dynamics 9200 series power converter, which has 3 modes: boost (14.4 v) normal (13.6) and storage (13.2)

I don't know whether I need to replace that with a MPPT charger/ controller or whether the Progressive will work with the solar

But regardless of the answer on charger / controller, I WILL upgrade the batteries, which are currently ordinary lead acid deep cycle.

QUESTION: SHOULD I UPGRADE TO AGM OR LITHIUM?
* is there value added in choosing lithium over and above the solar capacity I'm adding?
* if I do choose lithium, how does that impact the charger / controller decision?

Thanks for any perspective

p.s. we don't do a lot of boon docking; in fact, probably more of our stops are at hookups. But we do like the freedom of staying at state parks or national forests when we're in an area that is attractive. And would expect to do more of it with added ability to stay away from shore power. Finally, the fridge in this new unit is an absorption, and will run on battery ONLY if we're driving. Otherwise, it runs on AC when plugged in or on generator, and LP when not plugged in. This was the biggest drag on our battery capacity in the Interstate when we dry-camped
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Old 08-08-2016, 12:24 PM   #32
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The choice of solar charge controller is separate from what converter you use to charge your batteries from AC source. As to MPPT solar controller, if the little extra cost is not an issue, then I would go with that.

For Lithium, it is a much longer story . Yes if you can put Lithium in there, it would perform a lot better. The system however needs to be designed from day one for that and what you have will not work optimally. You can put it in there anyway but lifetime may be shorter.

An ideal Lithium system has a battery management system that is in charge of shutting down both charging of all sorts (engine, generator, solar and converter) plus discharge (all loads). With that in place, the health of the Lithium batteries is preserved for longest life.
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Old 08-08-2016, 12:49 PM   #33
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Quote:
Originally Posted by Marks71 View Post
Follow up question re: solar PLUS lithium:

We're trading in our Interstate for a Winn/Itaska Navion (pause for incoming ) It has no solar so I'm going to have 3-400w installed by an authorized guy. The vehicle comes with a Progressive Dynamics 9200 series power converter, which has 3 modes: boost (14.4 v) normal (13.6) and storage (13.2)

I don't know whether I need to replace that with a MPPT charger/ controller or whether the Progressive will work with the solar

But regardless of the answer on charger / controller, I WILL upgrade the batteries, which are currently ordinary lead acid deep cycle.

QUESTION: SHOULD I UPGRADE TO AGM OR LITHIUM?
* is there value added in choosing lithium over and above the solar capacity I'm adding?
* if I do choose lithium, how does that impact the charger / controller decision?

Thanks for any perspective

p.s. we don't do a lot of boon docking; in fact, probably more of our stops are at hookups. But we do like the freedom of staying at state parks or national forests when we're in an area that is attractive. And would expect to do more of it with added ability to stay away from shore power. Finally, the fridge in this new unit is an absorption, and will run on battery ONLY if we're driving. Otherwise, it runs on AC when plugged in or on generator, and LP when not plugged in. This was the biggest drag on our battery capacity in the Interstate when we dry-camped
If you're after something with additional space, AND it's Mercedes-based, AND it's already set up for solar and lithium, I think there's only one current choice: Pleasure-Way make a small coachbuilt; it's built with quality but personally I don't care for the layout.
And anyway, maybe you're already committed to a Winnebago!
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Old 08-08-2016, 01:21 PM   #34
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Do the lithiums still have the restriction on charging below freezing?
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Old 08-08-2016, 04:03 PM   #35
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Do the lithiums still have the restriction on charging below freezing?
As far as I know, yes. And in addition while reading about Lithiums a while back, I found out you cannot store them below -4F (-20C) which will cause the electrolyte to freeze, causing permanent damage. If storage temperatures go below -4F then you need to heat the batteries to above -4F to prevent damage.
So winterizing take on another meaning here.
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Old 08-08-2016, 05:14 PM   #36
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Do the lithiums still have the restriction on charging below freezing?
Yes. In the case of cells I am buying, starting at 5 degree C the charging current needs to be derated. I plan to put mine inside so it is not a major concern although there will be safety shut off.
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Old 08-08-2016, 07:36 PM   #37
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Quote:
Originally Posted by Marks71 View Post
Follow up question re: solar PLUS lithium:



We're trading in our Interstate for a Winn/Itaska Navion (pause for incoming ) It has no solar so I'm going to have 3-400w installed by an authorized guy. The vehicle comes with a Progressive Dynamics 9200 series power converter, which has 3 modes: boost (14.4 v) normal (13.6) and storage (13.2)



I don't know whether I need to replace that with a MPPT charger/ controller or whether the Progressive will work with the solar



But regardless of the answer on charger / controller, I WILL upgrade the batteries, which are currently ordinary lead acid deep cycle.



QUESTION: SHOULD I UPGRADE TO AGM OR LITHIUM?

* is there value added in choosing lithium over and above the solar capacity I'm adding?

* if I do choose lithium, how does that impact the charger / controller decision?



Thanks for any perspective



p.s. we don't do a lot of boon docking; in fact, probably more of our stops are at hookups. But we do like the freedom of staying at state parks or national forests when we're in an area that is attractive. And would expect to do more of it with added ability to stay away from shore power. Finally, the fridge in this new unit is an absorption, and will run on battery ONLY if we're driving. Otherwise, it runs on AC when plugged in or on generator, and LP when not plugged in. This was the biggest drag on our battery capacity in the Interstate when we dry-camped

A Progressive Dynamics PD-9200 will be OK for AGMs but not great. No custom programming or temperature compensation. You would be better with a fully programmable inverter/charger from Victron or Magnum.

And speaking of Victron, they have a nicely designed lithium package with full battery monitor capabilities and automatic low temp cut-off features to protect the battery from damage due to charging in below freezing conditions or from excessive draw.

They are light years ahead of AGMs, but also far more expensive.

Whatever floats your boat!!!!

And BTW, you can fit 480 watts of solar (3 X 160 watt panels) on the roof of a View. I've done many. :-))




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Old 08-08-2016, 07:48 PM   #38
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Cool, thanks
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