Battery Gr 31 AGM Unfamilar Territory

Ahh, you just need to teach your brain to twiddle the voltage pot in your sleep is all.
;)

So how are the cheapowatts to be engaged? Are you going to just set their voltage to Lifeline's 13.3v float at 77F?, and run cpap and other gizmo off inverter and AGM.

When power goes out battery depletes, when power comes back on, cheapowatts buzz away until Lifeline agm requires less than 72.4 amps? well plus inverter loads. how much is that? the inverter load powering the Cpap?

Depletion below that threshold might very well happen before the chreapowatts release the magic blue smoke.

I think my 27 Northstar might have lower resistance than the Lifeline, So I think it will gobble up more amperage than the 31 lifeline would, even if the lifeline weighs 6 Lbs more. Also my NS Agm Absv is 14.7v, My last read on the lifeline pdf said 14.3v at 77f AbsV.

I think you'll be okay. Extra fans /heatsinking couldn't hurt. I can help you out there when you next return stateside. I'm in North County SD.

Obviously rate of recharge will be slower after 13.3v is approached, but it should make it through the night. Then on awakening, if power has returned, you crank their pots to the max till battery reaches 14.3v, and 14 awg would then be your nemesis.

Not ideal, but certainly workable.

This is from Xantrex, and other sources

A group 31 non-optima is 130 amp hours (Optima abut 75)
Multiplying by 0.3 that means 39 amps is your max recommended recharge rate.

UNLESS, it is a lifeline, in which case that is the MINIMUM and you can hit it with like 300 amps for the bulk mode. (Source: Lifeline)

Yes it's a Lifeline. The original "plan" was to overwhelm charge acceptance with a bevy of CheapOWatts. Reality reared its ugly head and the 2nd batch was delayed. Plan B is in effect. Parts Store in USA. Six feet of 14 gauge fusible link wire (cross link insulation). The shottky pair will be connected, and both power supplies will share the misery. Don't see why I can't preset voltage while the units are operating open circuit, shut down, connect and then re-plug the power cord. I did bring along my Triplett meter. Load sharing, yadda, voltage yadda, Don't know if I needs fans or a power unit out of a Huey to keep these critters from Seppuku. Lose face, plunge knife in belly and yank upward.

Hmmm .... my CPAP (non-moisture-injection -> air pressure only) will operate many nights on our two Group 29 AGMs.

Trying to pump up to C/1 currents into your/any AGM can of course be done with plenty of super cooling while it's happening. How do you plan on throttling back those CheapOWatts versus battery temperature?

Sitting around watching a thermometer at the same as twittling a voltage control pot seems stressful and defeating the very purpose for having the CPAP in the first place. :h

Lifeline GPL-31T Charging specifications
Bulk Charge Voltages: 14.20 - 14.60
Absorption Charge Voltages: 14.20 - 14.60
Float Charge Voltages: 13.10 - 13.40
The GPL-31T is designed for charging amperages up to 262.5 amps or 250% of the rated Amp Hour Capacity due to low battery internal resistance.

EsoxLucius wrote:
2013 LTV Unity MB Theater Seats
500 watts solar panels, 440 AH batteries, BlueSky Solar Boost 3024iL & IPN-Pro Remote, Magnum MS2000 & ME-RC50 remote
Koni Shocks F & R, Hellwig 7254, SumoSprings F & R
2012 Hyundai Accent SE, Blue Ox Aladdin/Patriot

Jay,

Off topic, but I notice that you're running Koni shocks on your LTV.

What Koni shocks are they?

I'm looking for performance inputs from motorhome owners with Koni FSD shocks on their rigs.

Respironics 5.11 amperes @ 12.04 volts.

The GPL-31T is designed for charging amperages up to 262.5 amps or 250% of the rated Amp Hour Capacity due to low battery internal resistance.

If this came from Concorde battery they are contradicting themselves. The user manual recommended by Corcorde last week clearly states the battery can accept a 500 ampere charge rate and return from a 95% discharge (5% remaining) in less than an hour.
Document 6-0101 Revision D (2014)

Regardless, the battery is going to ultimately be fed with a mere 120 amperes. And I will increase charge lead size to 12AWG to throttle current proportionate to the charger's wattage potential limit.

My CPAP draws around an amp and a half powered from 12 volts, but it does no heating ... just pushes air on a setting of 10. Over several days use, mine hardly impacts our 200 amp hours of AGM battery capacity.

Why does your unit draw so much current? You might want to get an upgrade. I'm told that Medicare pays for a new one every five years. I'm about to look into the new little tiny one that automatically adapts to your needs by adjusting it's pressure to dynamically match your breathing. I'm not sure it operates off 12V though - still checking into it.

It is indeed the humidifier causing the issue. Without it, I have major problems, and my AHI soars, my cardiologist roars, and I don't feel so hot during the day. The OMRON BP monitor confirms irregular heat beat. Ain't life grand when someone reaches the age when nothing works right except what's between the ears?

MEXICOWANDERER wrote:
Ain't life grand when someone reaches the age when nothing works right except what's between the ears?

I don't know which way to go on that: The DW and myself last fall went through the passing of her beloved mother ... who had a healthy body well into her 90's but a gradually deteriorating mind due to years and years of slowly advancing Alzheimer's. It was a long, long good-by and took a terrific toll on many loved ones who were involved in the situation. The IQs that be HAVE TO DO SOMETHING about that blasted Alzheimer's.

If one or the other has to go I'm of the opinion that a good mind right to the end is top priority, as it's our mind (and soul) that in fact make us "a person". I guess Stephen Hawking is an example of that taken to the extreme.

We can just do the best we can with what we have and hopefully help some others along their journeys till our last breath. :)