tRoN

Executive Member
Joined
Mar 13, 2007
Messages
6,511
Quick question about LA batteries and battery balancing.

I had upgraded from 2x Mecer Lobo to a 24 Mecer Axpert 3kw

So now I have 4 x 102ah batteries (2 series each then pair in parallel) connected.

When I look at the battery meter of each individual battery, the one battery gets to a very low voltage after 2hrs but the inverter still shows 3 bars of battery power.

How long will this be sustainable for before I need to change the batteries?

Then do I have to change the pair or all 4. Is it bette to have 2x 200ah batteries or 4x100ah like the current setup

4f830c0f01782ae11a1049f3c27efabb.jpg


2fb46708db97f3d424fb3f418bca85b9.jpg

ca6623bc37f3985cddfc77162eccbb61.jpg
 

TheChamp

Honorary Master
Joined
Feb 26, 2011
Messages
40,629
Quick question about LA batteries and battery balancing.

I had upgraded from 2x Mecer Lobo to a 24 Mecer Axpert 3kw

So now I have 4 x 102ah batteries (2 series each then pair in parallel) connected.

When I look at the battery meter of each individual battery, the one battery gets to a very low voltage after 2hrs but the inverter still shows 3 bars of battery power.

How long will this be sustainable for before I need to change the batteries?

Then do I have to change the pair or all 4. Is it bette to have 2x 200ah batteries or 4x100ah like the current setup

4f830c0f01782ae11a1049f3c27efabb.jpg


2fb46708db97f3d424fb3f418bca85b9.jpg

ca6623bc37f3985cddfc77162eccbb61.jpg
One set is most probably dying, just let it run its course and die, remove it and connect the other one, let it also die and get a pair of Hubble S100 as replacement.

Maybe to mitigate for now, remove the good pair of batteries from the system, leave the other one that discharges quickly, let it charge properly over time and see if it doesn't improve. What happens is that the one pair that goes weak is going to kill the other good pair.
 

tRoN

Executive Member
Joined
Mar 13, 2007
Messages
6,511
One set is most probably dying, just let it run its course and die, remove it and connect the other one, let it also die and get a pair of Hubble S100 as replacement.

Maybe to mitigate for now, remove the good pair of batteries from the system, leave the other one that discharges quickly, let it charge properly over time and see if it doesn't improve. What happens is that the one pair that goes weak is going to kill the other good pair.

Seems like only 1 of the 4 is dying though.

Will the Hubble give me the same capacity as my current setup as 2 in series will only provide 100ah instead of 200ah?

I’m thinking 1920 watt/hr at 80% DOD for the Hubble versus 2400 watt/hr at 50% DOD of the lead acids or am I missing something here ?
 

TheChamp

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Feb 26, 2011
Messages
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Seems like only 1 of the 4 is dying though.

Will the Hubble give me the same capacity as my current setup as 2 in series will only provide 100ah instead of 200ah?

I’m thinking 1920 watt/hr at 80% DOD for the Hubble versus 2400 watt/hr at 50% DOD of the lead acids or am I missing something here ?
You can buy 4 if you can, I was just using my own measurement of affordability. My point was not to replace the LA for R7k a pair while you can easily get lithium for under R10k.

I had the same setup as yours, two sets of 24V, one day coming from work my flat was filled with that famous boiling battery smell, the battery was hot to the touch, I removed it and the other 3 looked fine, they all died one after the other until only one showed signs of life, I can assume the other died from overcharging while the charger was trying to prop that one up.
 

tRoN

Executive Member
Joined
Mar 13, 2007
Messages
6,511
You can buy 4 if you can, I was just using my own measurement of affordability. My point was not to replace the LA for R7k a pair while you can easily get lithium for under R10k.

I had the same setup as yours, two sets of 24V, one day coming from work my flat was filled with that famous boiling battery smell, the battery was hot to the touch, I removed it and the other 3 looked fine, they all died one after the other until only one showed signs of life, I can assume the other died from overcharging while the charger was trying to prop that one up.

I don’t want to replace anything now if I can avoid it

My question on whether 2x200ah is better than 4x102 ah remains unanswered though.

I can budget for 2x200ah AGM or 4x 102ah flooded LA but certainly not 4 Hubble’s.
 

TheChamp

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Feb 26, 2011
Messages
40,629
I don’t want to replace anything now if I can avoid it

My question on whether 2x200ah is better than 4x102 ah remains unanswered though.

I can budget for 2x200ah AGM or 4x 102ah flooded LA but certainly not 4 Hubble’s.
It's the same.
 

thehuman

Expert Member
Joined
Nov 2, 2004
Messages
3,703
Quick question about LA batteries and battery balancing.

I had upgraded from 2x Mecer Lobo to a 24 Mecer Axpert 3kw

So now I have 4 x 102ah batteries (2 series each then pair in parallel) connected.

When I look at the battery meter of each individual battery, the one battery gets to a very low voltage after 2hrs but the inverter still shows 3 bars of battery power.

How long will this be sustainable for before I need to change the batteries?

Then do I have to change the pair or all 4. Is it bette to have 2x 200ah batteries or 4x100ah like the current setup

4f830c0f01782ae11a1049f3c27efabb.jpg


2fb46708db97f3d424fb3f418bca85b9.jpg

ca6623bc37f3985cddfc77162eccbb61.jpg
Temporary add a small 5w 12v bulb over higher battery .
Till voltage more equal.
One of your batteries dying tho and it can hurt the good ones.
 

tRoN

Executive Member
Joined
Mar 13, 2007
Messages
6,511
Temporary add a small 5w 12v bulb over higher battery .
Till voltage more equal.
One of your batteries dying tho and it can hurt the good ones.

Whilst charging and on float the voltages are equal though
 

thehuman

Expert Member
Joined
Nov 2, 2004
Messages
3,703
Whilst charging and on float the voltages are equal though
Can try float even ,bulb will draw battery with higher voltage down , remove bulb when voltage even .
Maybe need to repeat it when voltage go out of sync , or use lower wattage bulb to keep it there.
 

TheChamp

Honorary Master
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Feb 26, 2011
Messages
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I am just hoping we don't have any loadshedding all the way to December, we might be lucky and see prices falling even further.


 

Snyper564

Executive Member
Joined
Oct 1, 2008
Messages
9,214
Good day all,

I am currently sourcing quotes etc for the solar installation to be done.

I am thinking about going the 8Kw sunsynk off the bat as opposed to the 5kv.

Questions
1. Any reason the the installer would recommend min 4x3.5 pylontechs for this?
2. Would 3x3.5 work?
3. Assuming 2x5.5 hubbles would be fine?
 

TheChamp

Honorary Master
Joined
Feb 26, 2011
Messages
40,629
Good day all,

I am currently sourcing quotes etc for the solar installation to be done.

I am thinking about going the 8Kw sunsynk off the bat as opposed to the 5kv.

Questions
1. Any reason the the installer would recommend min 4x3.5 pylontechs for this?
2. Would 3x3.5 work?
3. Assuming 2x5.5 hubbles would be fine?
Even 1 would work, it's all about what you are going to draw from it.
 

wingnut771

Honorary Master
Joined
Feb 15, 2011
Messages
13,721
Good day all,

I am currently sourcing quotes etc for the solar installation to be done.

I am thinking about going the 8Kw sunsynk off the bat as opposed to the 5kv.

Questions
1. Any reason the the installer would recommend min 4x3.5 pylontechs for this?
2. Would 3x3.5 work?
3. Assuming 2x5.5 hubbles would be fine?
It's the whole 0.5C vs 1C debate. 4 pylontechs = (3.5 x 4) x 0.5C = 7kw continous power so you would actually need 5.

The hubbles = (5.5 x 2) x 1C = 11kw continuous power.
 

Snyper564

Executive Member
Joined
Oct 1, 2008
Messages
9,214
It's the whole 0.5C vs 1C debate. 4 pylontechs = (3.5 x 4) / 2 = 7kw continous power so you would actually need 5.

The hubbles = (5.5 x 2) / 1 = 11kw continuous power.
barring getting into the whole hubble vs pylontech debate seems like the hubble would provide more power is this correct for less batteries needed?
 

TheChamp

Honorary Master
Joined
Feb 26, 2011
Messages
40,629
I guess im opening a can of worms if I ask beyond face value?
Nothing to worry yourself about what is not a face value, it's 11kWh of usable power.

I just meant other stuff we don't see or consider, like the quality of the build and support.
 
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