Hello all,
I have 4*4 12 Volt 200Ah deep cycle batteries.
Configuration is the standard, 4* parallel and 4* series to get 48 Volts array.
Left up is negative right down the positive connection.
So far, so good.
During discharge the first batteries discharge the most.
The one that have the negative connection and the one that have the positive connection.
While the middle batteries still have 12.4 volts, the first and last can be as low as 8.5 volts!!
Now I've always learned that lead acid below 10.5 volts is a dead battery.
Not able to recover, need to replace.
When I disconnect the load, slowly the voltage is rising, up to 10.5 and higher in time.
If I wait several hours, it's turns out to be about 12 volts, officially nothing to worry about.
But still....
8.5 volts??
That doesn't seem right to me.
It is not difficult to have the leads from the 4 connect to one point, not Daisy chain.
That would be more balanced discharge, as 4 batteries are used at the same time
(4 at the negative connection, 4 at the positive connection, and the 8 in the middle)
It have to do with resistance, as the first connection have the lowest resistance, that one gets the heavy load.
So, why do all the lead - acid setups advise to Daisy chain and make the connection to one battery and not all 4 at the same time?
(Cables need to have the same length to get the same resistance, so all are charged/discharged at the same time)
I can't understand why I should abuse the first connection batteries.
If someone could explain why it is a good idea to daisy chain instead of star, please inform me!!
The batteries are charged with solar panels, normally enough to have them fully charged at noon again.
Having the 8.5 volt reading worries me!
I have 4*4 12 Volt 200Ah deep cycle batteries.
Configuration is the standard, 4* parallel and 4* series to get 48 Volts array.
Left up is negative right down the positive connection.
So far, so good.
During discharge the first batteries discharge the most.
The one that have the negative connection and the one that have the positive connection.
While the middle batteries still have 12.4 volts, the first and last can be as low as 8.5 volts!!
Now I've always learned that lead acid below 10.5 volts is a dead battery.
Not able to recover, need to replace.
When I disconnect the load, slowly the voltage is rising, up to 10.5 and higher in time.
If I wait several hours, it's turns out to be about 12 volts, officially nothing to worry about.
But still....
8.5 volts??
That doesn't seem right to me.
It is not difficult to have the leads from the 4 connect to one point, not Daisy chain.
That would be more balanced discharge, as 4 batteries are used at the same time
(4 at the negative connection, 4 at the positive connection, and the 8 in the middle)
It have to do with resistance, as the first connection have the lowest resistance, that one gets the heavy load.
So, why do all the lead - acid setups advise to Daisy chain and make the connection to one battery and not all 4 at the same time?
(Cables need to have the same length to get the same resistance, so all are charged/discharged at the same time)
I can't understand why I should abuse the first connection batteries.
If someone could explain why it is a good idea to daisy chain instead of star, please inform me!!
The batteries are charged with solar panels, normally enough to have them fully charged at noon again.
Having the 8.5 volt reading worries me!