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Post by bupkis on Aug 30, 2018 0:57:02 GMT
So with all this talk about AGM Batteries emitting dangerous or explosive gasses when the manufacturer of AGM Batteries (including Renogy) says that they can be mounted in any direction. Am I missing something? I was under the impression that AGM Batteries are completly sealed. valve-regulated lead-acid battery or VRLA if overcharged or charged faster than the H and O can recombine they will vent if the pressure inside exceeds the what the valve is set to open.
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v10
Solar Advocate
Posts: 81
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Post by v10 on Aug 30, 2018 2:15:56 GMT
Volvo installs them (starting battery) under the back floor of the xc70....
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Post by Admin on Aug 30, 2018 12:09:58 GMT
So with all this talk about AGM Batteries emitting dangerous or explosive gasses when the manufacturer of AGM Batteries (including Renogy) says that they can be mounted in any direction. Am I missing something? I was under the impression that AGM Batteries are completly sealed. AGM batteries are virtually completely sealed and can be mounted in different directions due to the mesh inside which prevents spills like in normal lead acid batteries. AGM charging abuse, while not immediately apparent, can and will pressurize internally, by which the the battery might buildup and have a one-way pop out valve to safely release or vent the fumes. The rate at which the fumes are released is heavily regulated due to the mesh inside the battery, so not near those dangerous amounts, at least not at one time. An un-ventilated battery can possibly (over time) have a buildup because the AGM battery might still need to vent if it is being abused. You can expect the battery to be irreversibly damaged. So while the fumes released are not at the rate for other batteries that leak acid, we still recommend some type of ventilation, even if small. -Renogy Team
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Post by Admin on Aug 30, 2018 12:19:10 GMT
I have two Renogy Deep-Cycle AGM6-260 (6V 260 Ah/20Hr) batteries connected in series for my RV 12V system. In the Renogy battery specification of 'Charge Voltage 25-DegC' for 'Cycle Use' applications I see a note "max charge current: 27A". Is this actually the maximum charge current (in constant current Bulk Charge Stage) which can safely be pumped into these [series-connected] batteries? I thought Deep-Cycle AGM batteries tolerated high charging current rather well - yes? If so, then 27A seems well below another manufacturer's recommended AGM charge current of at least 52A (battery capacity 260Ah * 0.2) for repetitive deep cycling applications. Also, assuming that RV usage results in approx 50% DOD each day, it seems that daily charging at the low 27A or less (due to solar panels flat on roof and variable sun irradiation levels) may tend to risk an undercharge problem whereby the battery’s state of charge may gradually “walk down” as it is cycled over successive partially overcast days. If AGMs are subjected long term to under-charged cycling, wouldn't this eventually have negative affect on battery life? Am I missing something? For the time being, the recommendation stays the same. Some AGM batteries are capable of higher amperage charge and they can sometimes be up to 5x faster than flooded battery charging. However, at the same rate, charging a battery faster than can cause a buildup by which the batteries heat up and have to vent. Some manufacturers might recommend 0.2C for the battery, but this particular battery does not. We will look into this information and report if there is an update. -Renogy Team
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Post by tropex21 on Sept 25, 2019 11:10:27 GMT
The original AGM battery in my Mercedes is still going strong at 9 years. The instrument cluster can give you the current voltage and it's been doing fine lately so I haven't bothered to replace it yet. Advance Auto typically has good coupon codes to take the price down about $50 so they're not too much more than regular batteries plus they last longer and you don't get the corrosion on the terminals you normally get on flooded batteries. expertpickhub.com/
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Post by Admin on Oct 14, 2019 18:01:52 GMT
So with all this talk about AGM Batteries emitting dangerous or explosive gasses when the manufacturer of AGM Batteries (including Renogy) says that they can be mounted in any direction. Am I missing something? I was under the impression that AGM Batteries are completly sealed. AGM and GEL batteries are designed to be Spill-proof through acid encapsulation in matting technology. This means you can mount them right side up, or on their sides. It is not recommended for them to be mounted upside down.
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