AGM Battery Recharge Time





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  1. #1
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    Default AGM Battery Recharge Time

    Hi. With no stock on the batteries i was going to get (Enertec 105ah Deep Cycle) i started looking around.

    The Deltec AGM batteries looks pretty good.
    So considering 2 x 100ah Deltec AGM batteries.

    How quickly does a AGM battery recharge? I know Deep Cycle takes long so maybe the AGM is much quicker?
    It the 100ah AGM a no brainer over the 105 Deep Cycle?

    Click image for larger version. 

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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by TheWall View Post
    Hi. With no stock on the batteries i was going to get (Enertec 105ah Deep Cycle) i started looking around.

    The Deltec AGM batteries looks pretty good.
    So considering 2 x 100ah Deltec AGM batteries.

    How quickly does a AGM battery recharge? I know Deep Cycle takes long so maybe the AGM is much quicker?
    It the 100ah AGM a no brainer over the 105 Deep Cycle?

    Click image for larger version. 

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    What price were you quoted if you don't mind me asking

  3. #3
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    Default Re: AGM Battery Recharge Time

    Such a difficult subject.

    What is a deep cycle, what is a AGM, what is a Lead Crystal, what is a sealed GEL SLRA, what is a spiral cell battery, what is a SLVRA, whatís the difference between a Lead Acid and a Silver Calcium.

    To a very large extent, marketing BS.
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    Default Re: AGM Battery Recharge Time

    Agree
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    Default Re: AGM Battery Recharge Time

    Yip, must agree on that. Marketing Bull.
    I am trying to justify the extra +-R800 i will pay extra for the 2 x AGM...

    So far i dont see a difference between AGM and Deep cycle that will affect me but nut sure if charging a AGM will be quicker?

    Comparing to Enertec 105ah and Deltec 100ah AGM.

    I am just waiting for a exact price with Delivery included but think it will be around R2600 for the AGM.

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    Default Re: AGM Battery Recharge Time

    For reference I paid R2100 incl VAT for that battery at Current Automation, but I did go and collect it.
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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by Quiksilver View Post
    For reference I paid R2100 incl VAT for that battery at Current Automation, but I did go and collect it.
    Thanks, just phoned them. They have Royal and some other AGM battery. Waiting for the details.
    Which one did you go for?

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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by TheWall View Post

    How quickly does a AGM battery recharge? I know Deep Cycle takes long so maybe the AGM is much quicker?

    An AGM takes just as long. I would not take one for camping if I am not assured of a long period of charging. Bulk charge is the easy part. The final part is the crunch. Remember you might be drawing load whilst charging. AGM's also more fickle in relation to the correct voltages thru the whole charging cycle. Use correct spec as per spec sheet.

    I use AGM's on my home solar systems, after two days of cloud it's down to 50% and then needs two full days of sun to get completely full to float.

    My 2cw

    Attached article for interest
    Attached Files Attached Files
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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by Prof View Post
    An AGM takes just as long. I would not take one for camping if I am not assured of a long period of charging. Bulk charge is the easy part. The final part is the crunch. Remember you might be drawing load whilst charging. AGM's also more fickle in relation to the correct voltages thru the whole charging cycle. Use correct spec as per spec sheet.

    I use AGM's on my home solar systems, after two days of cloud it's down to 50% and then needs two full days of sun to get completely full to float.

    My 2cw

    Attached article for interest
    Baie dankie vir die tipes batterye en elkeen se gebruik. Dis nogal 'n eye opener.
    Wat ek egter vreemd vind is dat die lys aandui dat AGM vinniger gelaai kan word en dit kom van meeste bronne af. Nou klink dit vir my jou ondervinding is dit andersom.

    As dit 2 dae vat om weer te laai van solar af wat is die ontlaaistroom oor die 2 dae en hoeveel Ah is die DOD van 50%.
    Verder teen watter stroom laai dit as die son weer skyn?
    Jammer vir die baie vrae.

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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by Prof View Post
    An AGM takes just as long. I would not take one for camping if I am not assured of a long period of charging. Bulk charge is the easy part. The final part is the crunch. Remember you might be drawing load whilst charging. AGM's also more fickle in relation to the correct voltages thru the whole charging cycle. Use correct spec as per spec sheet.

    I use AGM's on my home solar systems, after two days of cloud it's down to 50% and then needs two full days of sun to get completely full to float.

    My 2cw

    Attached article for interest
    I see you use the Rolls Royce of batteries.

    Here is an interesting little snippit.

    Latest research points to a lot of battery damage being due to that last 5 or 10% of charge AFTER the bulk charge. Especially if you are force feeding it with a high voltage. (AKA Intelligent/Smart Chargers and DC-DC chargers.)
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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by Fluffy View Post
    I see you use the Rolls Royce of batteries.

    Here is an interesting little snippit.

    Latest research points to a lot of battery damage being due to that last 5 or 10% of charge AFTER the bulk charge. Especially if you are force feeding it with a high voltage. (AKA Intelligent/Smart Chargers and DC-DC chargers.)
    I am interested to hear this. I always worried about the hear being generated in that last phase, pushing the batteries close to 15volt in the final stage. Especially with sealed batteries where there is no way to top up the electrolite

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    Default Re: AGM Battery Recharge Time

    My setting on AGM as follows: (48V system)

    Equal/ Absorption: 59V (14.75V) max 1hr....most time MPPT uses less time to go to float
    Float: 54.8V (13.7V)
    Max amps: 35A (my panels does not achieve this, max seen 25A)

    All as per Battery spec sheet, thus my pointing out to follow the spec sheet as per Post#8
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    Last edited by Prof; 2019/04/30 at 05:45 PM. Reason: xtra info
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    Default AGM Battery Recharge Time

    Does anybody have any user experience with those Discover EV Traction Dry Cell Deep Cycle batteries? Iím looking to replace two 105ah Royals used to run an 80 & a 40 litre National Luna (two fridge freezers, the 80 being a double door with fridge compartment and freezer compartment) recharging via 2 x 100w solar panels through a Victron MPPT (75/15 I think without going out to the Cruiser to look). At over R5k each they are a hefty investment but if they are going to do the job, and last, then...
    Last edited by DarylB; 2019/05/02 at 11:27 AM.
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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by DarylB View Post
    Does anybody have any user experience with those Discover EV Traction Dry Cell Deep Cycle batteries? I’m looking to replace two 105ah Royals used to run an 80 & 40 litre National Luna, recharging via 2 x 100w solar panels through a Victron MPPT (75/15 I think without going out to the Cruiser to look). At over R5k each they are a hefty investment but if they are going to do the job, and last, then...
    I spoke to the Technical Manager of NL in jhb and he advised me to buy a discover agm; i got one for R4700 ; it is working very well ; i use a 100w solar panel in my van ; note: the old 102 Amphr that i had in the van did not keep up with the solar panel and the 90l NL set at -18deg /+5deg; in 2017 on a trip in namibia we spent about 5 days on solar through nkasa rupara and moshi conservancy ; and the battery depleted to almost 0% voltmeter reading due to my mistake i must say of keeping the NL at -18deg ; so we almost almost lost all our meat and just managed to reach divundu area where things were restored under 220v....; so i decided to buy a new battery and transferred the 102 amphr one to the NL powerpack ...and also reset the NL fridge to -9 /+2 deg ... so far no problems .... )
    Last edited by Jayefe; 2019/05/02 at 01:41 AM.

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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by Jayefe View Post
    I spoke to the Technical Manager of NL in jhb and he advised me to buy a discover agm; i got one for R4700 ; it is working very well ; i use a 100w solar panel in my van ; note: the old 102 Amphr that i had in the van did not keep up with the solar panel and the 90l NL set at -18deg /+5deg; in 2017 on a trip in namibia we spent about 5 days on solar through nkasa rupara and moshi conservancy ; and the battery depleted to almost 0% voltmeter reading due to my mistake i must say of keeping the NL at -18deg ; so we almost almost lost all our meat and just managed to reach divundu area where things were restored under 220v....; so i decided to buy a new battery and transferred the 102 amphr one to the NL powerpack ...and also reset the NL fridge to -9 /+2 deg ... so far no problems .... )
    Thanks Jayefe,

    So that AGM then is different to the Traction dry cell battery, or is it the same one Iím talking about?

    Yep, no need to keep that freezer on -18 once everything is frozen, though if I get the opportunity to plug into AC 220v anywhere then I do dial it down. I usually keep my double-door NL on -10 & +4 when running on battery power. And restrict opening that freezer compartment too often. Or putting anything unfrozen into it.

    Any idea how long it takes to get that battery back up to full power after a deep discharge?
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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by DarylB View Post

    Any idea how long it takes to get that battery back up to full power after a deep discharge?
    There is no definitive answer to that...

    Too many variables.

    • Summer/Winter
    • cloudy/clear
    • irradiation
    • size of charging system, solar or charger
    • amount drawn while recharging
    • depth of discharge
    • and all the others I failed to mention
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    Default Re: AGM Battery Recharge Time

    Prof - What brand of batteries are you using for solar?
    Is RA12-150D a brand?

    Why did you choose these?
    Did you look at any other brands?
    All advice appreciated!

    Quote Originally Posted by Prof View Post
    My setting on AGM as follows: (48V system)

    Equal/ Absorption: 59V (14.75V) max 1hr....most time MPPT uses less time to go to float
    Float: 54.8V (13.7V)
    Max amps: 35A (my panels does not achieve this, max seen 25A)

    All as per Battery spec sheet, thus my pointing out to follow the spec sheet as per Post#8
    Last edited by Paul Dold; 2019/05/02 at 01:09 PM.

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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by Prof View Post
    There is no definitive answer to that...

    Too many variables.

    • Summer/Winter
    • cloudy/clear
    • irradiation
    • size of charging system, solar or charger
    • amount drawn while recharging
    • depth of discharge
    • and all the others I failed to mention
    Thanks Prof.

    I was actually just wondering because Iíve read that certain types of battery take longer to recharge than others.
    ďIf you want to go into the bush, take a Ford. If you want to get back, take a Landcruiser!Ē

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    ARB bullbar; 9000kg T-Max winch; Outback roofrack; Double fuel tank; Outback Extreme spare wheel carrier x 2; Air Spring boosters; Racor diesel filter; NL dual battery set-up; 2 x 100w solar panels; Big Country gullwings, Front Runner drawer system; Stofpad 4x4 drop-down fridge slide; NL 78-litre double door fridge/freezer; NL 60-litre freezer; Eeziawn rooftop tent; Eeziawn awning.

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  22. #19
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    Default Re: AGM Battery Recharge Time

    I find -5C is as low as I need to go.
    Used to go to -10 before doing some tests.


    Quote Originally Posted by DarylB View Post
    Thanks Jayefe,

    So that AGM then is different to the Traction dry cell battery, or is it the same one Iím talking about?

    Yep, no need to keep that freezer on -18 once everything is frozen, though if I get the opportunity to plug into AC 220v anywhere then I do dial it down. I usually keep my double-door NL on -10 & +4 when running on battery power. And restrict opening that freezer compartment too often. Or putting anything unfrozen into it.

    Any idea how long it takes to get that battery back up to full power after a deep discharge?

    ďAfrica changes you forever, like nowhere on earth. Once you have been there, you will never be the same." - Ernest Hemingway

  23. #20
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    Default Re: AGM Battery Recharge Time

    Quote Originally Posted by Paul Dold View Post
    Prof - What brand of batteries are you using for solar?
    Is RA12-150D a brand?

    Why did you choose these?
    Did you look at any other brands?
    All advice appreciated!
    SonX brand.

    When I started of Omnisolar in George only believed in SonX as an alternative to those large National Battery flooded ones. That is now five years ago.
    Robert van den Berg

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    2002 Daihatsu Rocky 'The Bully'

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