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Old 03-05-2014, 10:23 PM   #11
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If you are not worried about potential of a hydrogen explosion read this -
http://www.cdtechno.com/pdf/ref/41_6739_0112.pdf
Was that meant for me? Did you read and understand that hydrogen is only an issue ONCE you have reached the FLOAT stage (i.e. 100% charge) or if you are doing EQ?? And only if you are FLOATING above 13.8V for a 12V battery? How is he going to get fully charged and even GET to float off of that...let alone exceed proper float voltage with a controller?
Did you also understand that the hydrogen has to reach 4% and this is a tent camper?
NO I am not worried that his single 80 watt solar panel charging system is going to blow up his tent.
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Old 03-06-2014, 09:50 AM   #12
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I understand there are lots of maybes here but batteries off-gas during charging and discharging. The potential for problems in this case are very low but they do exist. Batteries in most rv's are either in a sealed box and vented or open to the air.

If I had a choice I would error on the side of caution and place the batteries in a vented box or outside.
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Old 03-06-2014, 03:10 PM   #13
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Interstate deep cycle group 27 rated at 5 amps - 18.9, 15 amps 5.5.

If you are not worried about potential of a hydrogen explosion read this -
http://www.cdtechno.com/pdf/ref/41_6739_0112.pdf
I've noticed it states hydrogen gets created and vented during the charging process and nothing about when simply in use. I will look into this more and verify.
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Old 03-06-2014, 03:16 PM   #14
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Not getting a "warm fuzzy" after reading about this battery.

RV.Net Open Roads Forum: Walmart "Deep Cycle" Batteries - Number of Cycles

The only number in Wal-Mart's web page says it has 675 Cranking Amps; nothing about AH. Dual Purpose Marine batteries like this one usually have their storage capacity in RC or Reserve Capacity. THAT number is in minutes of use at 25 amps draw. To convert RC to AH (hours at 20 amps) you need to multiply the RC by 0.4167

Everstart is a Wal-MArt "house brand" made by Delphi and some by Exide.

Who Makes Everstart Batteries? - Ask.com Answers
Walmart's online information is sporadic and inconsistent. I had to jump back and fourth from USA and CAN sites. The 27DC-850N battery I seen with my own eyes does state CCA=675 MCA=850 RC=180 and AH=120. I assume they are using a non 20 hour test period to achieve a 120 Ah rating. The label states it is made by Johnson Controls.
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Old 03-06-2014, 03:24 PM   #15
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Was that meant for me? Did you read and understand that hydrogen is only an issue ONCE you have reached the FLOAT stage (i.e. 100% charge) or if you are doing EQ?? And only if you are FLOATING above 13.8V for a 12V battery? How is he going to get fully charged and even GET to float off of that...let alone exceed proper float voltage with a controller?
Did you also understand that the hydrogen has to reach 4% and this is a tent camper?
NO I am not worried that his single 80 watt solar panel charging system is going to blow up his tent.
Usage will occur indoors (tent trailer), disconnected at night and recharged outdoors.
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Old 03-06-2014, 06:49 PM   #16
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Even better. You have ZERO to worry about....instead of merely .00000000000000001 chance in hell of anything bad happening!
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Old 03-06-2014, 07:46 PM   #17
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Even better. You have ZERO to worry about....instead of merely .00000000000000001 chance in hell of anything bad happening!
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