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Old 01-22-2018, 08:41 PM   #1
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Battery Charging

Wife and I bought a 2013 Winnebago Adventurer 37F floor plan a week ago. Now have it at an RV Storage place plugged into 110/115 volt AC to keep batteries charged. Should the chassis and house battery disconnect switches be on or off?
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Old 01-22-2018, 08:49 PM   #2
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If you have shore power, leave the disconnect switches set to 'ON.' They are only turned off when storing without shore power available.
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Old 01-22-2018, 10:06 PM   #3
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Quote:
Originally Posted by Spadman View Post
Wife and I bought a 2013 Winnebago Adventurer 37F floor plan a week ago. Now have it at an RV Storage place plugged into 110/115 volt AC to keep batteries charged. Should the chassis and house battery disconnect switches be on or off?
I had 5 new batteries installed today, 3 new deep cycle for the coach and 2 chassis batteries on my Journey. I kept mine plugged in all the time. The installer told me to NOT keep the MH plugged into shore power all the time. This keeps the batteries charged yet they fail prematurely as they do not cycle up and down. He suggested monitoring the voltage (probably monthly) and if it gets close to 11.5 volts, plug it into to recharge the batteries. Everything in the coach is again working like new again.
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Old 01-22-2018, 10:33 PM   #4
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Originally Posted by dwaynederose View Post
I had 5 new batteries installed today, 3 new deep cycle for the coach and 2 chassis batteries on my Journey. I kept mine plugged in all the time. The installer told me to NOT keep the MH plugged into shore power all the time. This keeps the batteries charged yet they fail prematurely as they do not cycle up and down. He suggested monitoring the voltage (probably monthly) and if it gets close to 11.5 volts, plug it into to recharge the batteries. Everything in the coach is again working like new again.
I think your installer is trying to sell and install more batteries! The general rule of thumb is not to let batteries fall below 50% state of charge. That does NOT mean a 12v battery can be run down to 6v, but to about 12.06v

Your installer's suggestion to run them down to 11.5v would be at about the 18-20% state of charge, far too low for healthy battery life!

Unless you're running a battery-powered forklift 50% is about as low as you should go.
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Old 01-22-2018, 10:44 PM   #5
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Originally Posted by dwaynederose View Post
I had 5 new batteries installed today, 3 new deep cycle for the coach and 2 chassis batteries on my Journey. I kept mine plugged in all the time. The installer told me to NOT keep the MH plugged into shore power all the time. This keeps the batteries charged yet they fail prematurely as they do not cycle up and down. He suggested monitoring the voltage (probably monthly) and if it gets close to 11.5 volts, plug it into to recharge the batteries. Everything in the coach is again working like new again.
2X.....on this but it is best if the batteries are kept above 12.1V (50%).

After wrecking more than a few batteries by leaving them plugged into a 3 stage (bulk, absorb, float) converter I'll either charge and check to make sure the batteries are holding 12.6V-12.8V after being disconnected then leave them for 2 months or use a BATTERY CHARGER that stops charging (not maintain) and goes into standby.

We are taking about lead acid batteries arn't we
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Old 01-22-2018, 10:46 PM   #6
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Originally Posted by dwaynederose View Post
I had 5 new batteries installed today, 3 new deep cycle for the coach and 2 chassis batteries on my Journey. I kept mine plugged in all the time. The installer told me to NOT keep the MH plugged into shore power all the time. This keeps the batteries charged yet they fail prematurely as they do not cycle up and down. He suggested monitoring the voltage (probably monthly) and if it gets close to 11.5 volts, plug it into to recharge the batteries. Everything in the coach is again working like new again.
Your installer doesn't know anything about batteries !
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Old 01-22-2018, 10:58 PM   #7
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I think your installer is trying to sell and install more batteries! The general rule of thumb is not to let batteries fall below 50% state of charge. That does NOT mean a 12v battery can be run down to 6v, but to about 12.06v

Your installer's suggestion to run them down to 11.5v would be at about the 18-20% state of charge, far too low for healthy battery life!

Unless you're running a battery-powered forklift 50% is about as low as you should go.
Your Battery guy needs to update his knowledge.
I think he is basing this on some of the older chargers, they would sometimes over charge your batteries and ruin them.

I don't think any of the new ones will do that, and if I'm wrong, someone please correct me.

DTW
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Old 01-23-2018, 01:25 AM   #8
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Your Battery guy needs to update his knowledge.
I think he is basing this on some of the older chargers, they would sometimes over charge your batteries and ruin them.

I don't think any of the new ones will do that, and if I'm wrong, someone please correct me.

DTW
Agreed..
What your install guy SHOULD have said is that it totally depends on the charger. The Dimensions chargers are known for boiling batteries, that's one of the reasons why people get rid of them. Not knowing what charging system you have, this is the #1 question before anyone can render an opinion further
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Old 01-23-2018, 07:20 PM   #9
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Agreed..
Not knowing what charging system you have, this is the #1 question before anyone can render an opinion further

Why didn't I thinking of that
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Old 01-24-2018, 09:07 AM   #10
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Originally Posted by Spadman View Post
Wife and I bought a 2013 Winnebago Adventurer 37F floor plan a week ago. Now have it at an RV Storage place plugged into 110/115 volt AC to keep batteries charged. Should the chassis and house battery disconnect switches be on or off?
This is what I do as the manual says "Do not leave MH plugged in during storage."

Information:
If your batteries are new and up to voltage they should show 12.6 Volts, or close. Older batteries may show less voltage but should not be below 12.1 Volts. Batteries have a limited life both in time in service, and charge and discharge cycles. Batteries should be clean, filled to fill line with distilled water, and only charged with a supplemental battery charger when disconnected from the coach at the battery terminal.

If your batteries check good, turn off your switches and leave MH unplugged.

Once every 4 to 6 weeks I turn on both switches and plug in MH for a day or two. I also start generator and let that run for 20 min or so ( this will also charge batteries). Then turn off switches. You may or may not want to check voltage fyi and confirm your battery condition.

Note: When plugged in, or generator running, or engine running, batteries will be charged by their respective systems and read 13.55 to 14 volts as they will be charging. This voltage will boil your batteries dry over time, sulfate your plates, and ruin your batteries. When your MH is in use and you are drawing amps from your bank, the batteries will charge without negative results except as stated above "time in service, and charge and discharge cycles" this is to be expected and considered normal wear.

Read your manual and enjoy!
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Old 01-24-2018, 09:24 AM   #11
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Most modern RVs have battery chargers that monitor the battery's state of charge and will not 'boil your batteries' but will reduce the charging rate as the battery comes up to full state of charge. If you have a charger that will not step down charge rate, I'd suggest you save up and buy a better charger, one with a maintenance charge level. A good, modern, charger CAN be left connected full time.

Leaving the RV for 4 to 6 weeks may be too long an interval, depending on your RV and how really 'disconnected' your battery disconnect switches are. In my case, the chassis disconnect will work with 100% disconnect over as long as 5 months, but the house system will discharge to a damaging level after 3 weeks unless I physically disconnect the battery at the posts with knife switches. Many modern RVs, with remote door locks, ECU and other power draining electronics may be the opposite, draining the chassis system faster. You'll have to explore and experiment with your own RV to find out.
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Old 01-24-2018, 10:25 AM   #12
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I carefully reread my manual and the 4 to 6 week charge interval is most likely to long as the gentleman stated. Winnebago recommends checking the voltage every 3 weeks and charging via shore power, generator, or driving if needed. The recommended storage procedure is to turn off the battery disconnect switches. Even though the manual states that the converter has a step down charger, adjusting the amperage or charge rate depending on the discharge state of the batteries and then trickle charges when batteries reach full charge, the manual states at least 4 times " Do not leave the shoreline plugged in during storage. Follow regular inspection and maintenance." Could be its a CYA thing but batteries due sulfate if they remain warm and even a trickle or float charge produces heat.
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Old 01-24-2018, 10:44 AM   #13
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I carefully reread my manual and the 4 to 6 week charge interval is most likely to long as the gentleman stated. Winnebago recommends checking the voltage every 3 weeks and charging via shore power, generator, or driving if needed. The recommended storage procedure is to turn off the battery disconnect switches. Even though the manual states that the converter has a step down charger, adjusting the amperage or charge rate depending on the discharge state of the batteries and then trickle charges when batteries reach full charge, the manual states at least 4 times " Do not leave the shoreline plugged in during storage. Follow regular inspection and maintenance." Could be its a CYA thing but batteries due sulfate if they remain warm and even a trickle or float charge produces heat.
Evidently, you didn't read the linked article about battery charging. You mentioned 3 different types of battery chargers, Trickle, Float, and 'step-down'. The link was to a maintenance*charger, which in addition to only giving the battery a charge rate to maintain it, also gives a desulfating*pulse to prevent the plates*from degrading. This would not be possible if the battery was disconnected for long periods of time. As I previously stated, save up and buy a proper MAINTENANCE charger, one that can be left connected when in storage. Your batteries, and your wallet will benefit from the investment in such a charger.
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Old 01-24-2018, 11:16 AM   #14
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Lots of talk, but OP hasn't been back. His 2013 Winnebago has a Schumacher SARVC 55, a single stage 55 amp converter/charger (originally - if not replaced). It's under the counter in the back bathroom.

Not 100% sure, as Winnebago doesn't post 12 volt wiring diagrams for that year, but in slightly older Winnebagos, the battery disconnect switch would disconnect the house batteries from everything, no charging would take place.
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