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Old 10-15-2018, 07:57 PM   #1
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Default Charger: Incorrect absorption and float voltages

Hello,

My LW2000 inverter/charger is set to AGM2 but instead of the expected 14.6V absorption and 13.7V float voltages, the voltages are respectively 15V and 14V. Should I have the inverter/charger verified?

Thanks!
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Old 10-15-2018, 09:02 PM   #2
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I would get that checked.

Are you checking with your own multi-meter or is that from the inverter display?

Do you have Lithium or AGM batteries?
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Old 10-15-2018, 09:05 PM   #3
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I have a AGM battery and the measurements are from the panel voltmeter and a multimeter.
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Old 10-15-2018, 09:05 PM   #4
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Does that charger have temp compensation, maybe built internally so no battery sensor? OP looks to be in Canada, so it could be cold enough to see those kinds of voltages.
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Old 10-15-2018, 09:45 PM   #5
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Does that charger have temp compensation, maybe built internally so no battery sensor? OP looks to be in Canada, so it could be cold enough to see those kinds of voltages.
The Powerstar units have a temperature compensation RJ-11 port but AFAIK, since there may be multiple batteries at different ambient temps because of their different locations, Roadtrek doesn't implement any battery temp sensing probe. FWIW, the charger powers up in the boost mode for a programmable time period which perhaps accounts for these readings although I have never seen shoreside charging voltages this high on our 2017 210. These units are programmed for a specific VIN, so the program parameters should be looked at to ensure the charging profile is compatible with the batteries installed.
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Old 10-15-2018, 09:49 PM   #6
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Many chargers that have temp compensation ability but no sensor attached at an input will revert to an internal temp sensor for the compensation, which is certainly better than nothing. It would be interesting to see if that is the case with that charger.
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Old 10-15-2018, 11:32 PM   #7
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That would end up being the same as no temperature compensation if the interior of the van is maintained at say 72F for comfort.

Yoshimura - can you tell us what brand and model # battery you have? It might be easy to lookup the recommended charge profile for the actual battery.

I recall that the 185Ah battery used in the Zion had peculiar charge requirements and maybe yours is the same brand.
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Old 10-15-2018, 11:38 PM   #8
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Quote:
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That would end up being the same as no temperature compensation if the interior of the van is maintained at say 72F for comfort.

Yoshimura - can you tell us what brand and model # battery you have? It might be easy to lookup the recommended charge profile for the actual battery.

I recall that the 185Ah battery used in the Zion had peculiar charge requirements and maybe yours is the same brand.

Yes, that is absolutely true if the van temp is at 72*, but if the van is stored outside in Canada in cold weather, the inside of the van would be at ambient, so this time of year might only be 30*F. As the say "it all depends....."


I think the battery is the 185ah, but touted as 400 amps by Roadtrek Northstar TPPL battery.


Here is the generic Northstar TPPL manual. At 32* F they want 15v, it appears, and 14.7v at normal temp.


https://www.batteryplex.com/Sheets/N...ion-Manual.pdf
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Old 10-16-2018, 12:17 AM   #9
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Quote:
Originally Posted by cruising7388 View Post
The Powerstar units have a temperature compensation RJ-11 port but AFAIK, since there may be multiple batteries at different ambient temps because of their different locations, Roadtrek doesn't implement any battery temp sensing probe.............
That's what the manual indicates. I think cruising7388 posted this link the other day: https://www.sigineer.com/wp-content/...-2017-July.pdf

The temperature compensation looks to be more of a safety feature than continuous adjustment. The only details I can find are:

Quote:
When the battery voltage is over 40C (104F), it will reduce the charging voltage by 0.1Vdc with every degree of temperature rise.
and

temperarture control.JPG

on page 19.
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Old 10-16-2018, 03:23 AM   #10
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Quote:
Originally Posted by booster View Post
Many chargers that have temp compensation ability but no sensor attached at an input will revert to an internal temp sensor for the compensation, which is certainly better than nothing. It would be interesting to see if that is the case with that charger.
If it's the case with any charger, I think it's a bad design. If the port is not terminated it should default to no temperature compensation. If the charger environment and the battery environment are not at least similar in temperature, the charger temperature compensation could well be in the wrong direction. Our batteries are below chassis while the Powerstar charger is under the power sofa in a fairly confined space. Only rarely will the two ambient temperatures resemble each other.
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