I turned on bathroom and kitchen fans one evening. next afternoon battery was dead. Evidently ruined the battery. Nothing added or removed since new purchase 2 months ago. I there not a battery low voltage disconnect from factory?
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Originally posted by SEMOGreen View PostI turned on bathroom and kitchen fans one evening. next afternoon battery was dead. Evidently ruined the battery. Nothing added or removed since new purchase 2 months ago. I there not a battery low voltage disconnect from factory?
The dealer supplies the batteries (or batteries) not Grand Design, but if they only supplied you with a single Group 24 sized battery, with both of those fans running for 12+ hours I could see them not lasting. If you are planning to do dry camping or boondocking (camping without hookups) I recommend Lithium Iron Phosphate (commonly called Lithium batteries), or at least two lead acid batteries. The lithiums are lighter, hold more charge, and can be discharged to 0 with no damage (but are more expensive for those benefits). Many write ups here on the process, I use Lion Energy (on sale at Costco right now) but BattleBorn are favorites of RVers as well.Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
Neil Citro
2018 Reflection 28BH Pepwave
2019 F350 6.7L Long Bed Crew Cab
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Originally posted by ncitro View Post
No low voltage disconnect. Best recommendation is a good shunt/battery monitor. I am a fan of the Victron Smart Shunt or BMV, but I have also used the Trimetric in the past. I believe the Victron has an alarm for state of charge you can enable. With flooded lead acid batteries (what your dealer most likely equipped) they start to be damaged at 50% charge, and it can become irreparable at less than 30% I believe.
The dealer supplies the batteries (or batteries) not Grand Design, but if they only supplied you with a single Group 24 sized battery, with both of those fans running for 12+ hours I could see them not lasting. If you are planning to do dry camping or boondocking (camping without hookups) I recommend Lithium Iron Phosphate (commonly called Lithium batteries), or at least two lead acid batteries. The lithiums are lighter, hold more charge, and can be discharged to 0 with no damage (but are more expensive for those benefits). Many write ups here on the process, I use Lion Energy (on sale at Costco right now) but BattleBorn are favorites of RVers as well.Mitch & Anita
2022 - 297RSTS
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Originally posted by Jkwilson View PostA single discharge won’t ruin a battery. Leaving it dead will, but the idea that deeply discharging a battery damages it in some way is a myth.Mitch & Anita
2022 - 297RSTS
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Originally posted by Jkwilson View PostA single discharge won’t ruin a battery. Leaving it dead will, but the idea that deeply discharging a battery damages it in some way is a myth.
Rob
Cate & Rob
(with Border Collies Molly & Angel + Kitties Hazel & Elsie)
2015 Reflection 303RLS
2022 F350 Diesel CC SB SRW Lariat
Bayham, Ontario, Canada
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Originally posted by Jkwilson View PostA single discharge won’t ruin a battery. Leaving it dead will, but the idea that deeply discharging a battery damages it in some way is a myth.Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
Neil Citro
2018 Reflection 28BH Pepwave
2019 F350 6.7L Long Bed Crew Cab
- Likes 1
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Originally posted by SEMOGreen View PostI turned on bathroom and kitchen fans one evening. next afternoon battery was dead. Evidently ruined the battery. Nothing added or removed since new purchase 2 months ago. I there not a battery low voltage disconnect from factory?
While it wont prevent full discharge, you can visually see the issue occurring. Also remember the disconnect switch may not disconnect everything. There may be parasitic draws from the safety detectors (LP, NOX) To prevent this when in storage pull a battery cable.
Keith2018 Reflection 150 Series 220RK 5th whee, Star White 2022 F350 King Ranch CC Long bed (HAL) (CCC 4062lbs), B&W 25K OEM Companion,. SteadyFast system, Trailer reverse lights, rear receiver spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, Solar, Custom 6K axles upgrade, and other modifications.
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Originally posted by ncitro View Post
I have to agree with Rob here. It may not be 50% as suggested by the manufacturers, but 40 years or boat and RV battery experience has qualitatively shown me they do not do well being deeply discharged, especially for any kind of length of time. I have played the water/acid/desulfating game and they never come back right. As they said in Pet Sematary "They don't come back the same". Obviously this can vary widely depending on use (a boat starter mixed with low current loads/just low current loads/high current long duration ie inverter), which makes it hard to do a good clean study, but its far from a myth.
John & Kathy
2014 Reflection 303RLS
2014 F250 SC SB 6.2
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Originally posted by Jkwilson View Post
It’s the length of time. There is no level of discharge that results in disproportionate damage if the discharge is followed promptly by a moderately fast recharge. Any discharge that drops the electrolyte density below about 1.24 SG allows damage to occur over time. More damage occurs by drawing the battery to 70% state of charge and allowing it to sit for two weeks than drawing it down to 10% state of charge and immediately recharging.
I will certainly grant that lead acid batteries can work fine for rvers, but the care needed, maintenance, and weight per ah all go against the cost of lithium in my book. Those prices are down to the point now, and they have a projected lifespan long enough that I'll wholeheartedly recommend them to anyone doing any kind of dry camping or boondocking. Obviously if you're going to go only to full hookups, ora seasonal full hookup site that's another story. However for any kind of dry camping, you eliminate all the maintenance and can discharge them to zero with no penalty, they're an absolute win for an RV.
Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
Neil Citro
2018 Reflection 28BH Pepwave
2019 F350 6.7L Long Bed Crew Cab
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I've seen batteries left discharged come back, as mentioned not as strong.
As for getting one to charge that the new style chargers will not see, try hooking up another good battery to the dead one and see if the charger will kick in. once you let it charge for about 1 hr or so, un hook the known good battery and see what happens.Joseph
Tow Vehicle: 2024 GMC K3500 Denali Ultimate Diesel
Coach: 303RLS Delivered March 5, 2021
South of Houston Texas
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Originally posted by Yoda View Post
Mitch - I second the BMV suggestion. I have this one https://www.victronenergy.com/batter.../bmv-712-smart
While it wont prevent full discharge, you can visually see the issue occurring. Also remember the disconnect switch may not disconnect everything. There may be parasitic draws from the safety detectors (LP, NOX) To prevent this when in storage pull a battery cable.
Keith
MitchMitch & Anita
2022 - 297RSTS
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I may have fixed this battery. At least for a while. Found an “old” charger that has a “100a start” option. I did this for about 10 minutes then switched to the 3a. It was on there for about 3 hours and showed full charged. Put it back on my RV and so far so good. Will see how it lasts with me being more careful.Mitch & Anita
2022 - 297RSTS
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