Good Sam Club Open Roads Forum: Class A Motorhomes: Time to replace batteries??
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 > Time to replace batteries??

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CA Traveler

The Western States

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Joined: 01/03/2004

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Posted: 10/10/21 08:41am Link  |  Quote  |  Print  |  Notify Moderator

DiamondDan wrote:

Now the progressive dynamics 9280 converter is trying to blast 14.5V into the new ones, which doesn’t seem right and may be part of the original problem. All their troubleshooting is for no or low voltage, so that’s not super helpful.

My understanding of how they operate is they push 14.4 bulk charge to get to 80% before stepping down to 13.8 or 13.2 storage mode.
May be OK. With a good 3 stage charger and discharged wet cell battery the process is:

1. Bulk charging with constant amps and increasing voltage.
2. Absorb charging starts at 14.8V (80% SOC) and remains at that voltage as the amps taper down and then the voltage drops.
3. Float stage doesn't charge the battery but maintains it at 13.4V with very low amps.

Absorb charging at 14.8V can take a long time as the amps taper down to near 0A.

To observe the stages, you need a voltmeter and ammeter with the ammeter on the battery wire as charger amps are first diverted to any loads and then the battery. If the battery is disconnected then the charger and battery amps are the same.

There are variations and you can Google for details.


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DiamondDan

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Posted: 10/12/21 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

Dan,

Do you have the wizard? If so you can force it to charge at a lower voltage.

Supposed to be baked into the 9280. Will see if I can find the port to plug in a pendant. Thanks.

DiamondDan

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Posted: 10/12/21 07:37pm Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

Now the progressive dynamics 9280 converter is trying to blast 14.5V into the new ones, which doesn’t seem right and may be part of the original problem. All their troubleshooting is for no or low voltage, so that’s not super helpful.

The 9280 puts out 14.5 normally when first plugged in as the "BULK" charge. It will continue at (As I recall) 14.5 till it senses the batteries are full. then it drops to 13.6 for 20 hours. then back to 14.5 for like 15 minutes, then back to"Float" (13.6) for 20 hours.

I may be a bit off on the voltages. but 14.5 is normal

Thanks. Now that we are home, I’ll plug it in, monitor for charging voltage and signs of boiling, and report back here.
-Dan

DiamondDan

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Posted: 10/12/21 07:39pm Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler wrote:

DiamondDan wrote:

Now the progressive dynamics 9280 converter is trying to blast 14.5V into the new ones, which doesn’t seem right and may be part of the original problem. All their troubleshooting is for no or low voltage, so that’s not super helpful.

My understanding of how they operate is they push 14.4 bulk charge to get to 80% before stepping down to 13.8 or 13.2 storage mode.
May be OK. With a good 3 stage charger and discharged wet cell battery the process is:

1. Bulk charging with constant amps and increasing voltage.
2. Absorb charging starts at 14.8V (80% SOC) and remains at that voltage as the amps taper down and then the voltage drops.
3. Float stage doesn't charge the battery but maintains it at 13.4V with very low amps.

Absorb charging at 14.8V can take a long time as the amps taper down to near 0A.

To observe the stages, you need a voltmeter and ammeter with the ammeter on the battery wire as charger amps are first diverted to any loads and then the battery. If the battery is disconnected then the charger and battery amps are the same.

There are variations and you can Google for details.

Thanks. I don’t recall seeing so high a charge rate in the past, but I really wasn’t paying attention. I’ll plug it in now that we are home and monitor.
I appreciate the detailed description as the manufacturer’s documentation is kinda thin.

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