Post by Keith on Oct 21, 2017 13:36:57 GMT -8
I've got an interesting problem, if anyone can help solve.
My batteries are 2v 3000amp wet batteries X 12 = 24V
The system is 3 X Xantrex 4024 Inverters
4 X 60 amp charge controllers.
40 X 190W Solar Panels
In the beggining the batteries would slowly charge up and when fully charged would take some time to dis-charge. I added the solar panels 8 units at a time over several years until 40 panels were installed.
Upon recommendations from the battery supplier (year 2) I added Tin Sulphate and Sodium Sulphate Anhydrous to prevent the cells in the batteries from corrosion. We did this by adding the powder to the acid and water as a slurry then pouring it into the batteries in a measured amount for each battery.
What a bastard of a thing to do, the sulphates are PH Neutral, so the acidity in the batteries go alkaline, we had to keep adding acid mixed with water to increase the acidity of the battery water. The powder would keep disolving inside the batteries over a two year period. We finally got the correct acid reading and now it is maintaining these readings.
I imagine the acid along with the warming of the batteries when charging dissolves the sulphates better. There is probably some sulphates that do not dissolve. This could be causing an issue.
During this period I added a 10 amp hot water system to the system, silly me, when I had all outputs turned on and then turned on the inverter, the inverter made a shunting noise as the contacts closed. From then on the charge controllers and system controller have had 0.2v of difference in their readings.
Through equalisation the voltage differances from the system controller and the charge controllers are getting closer together 0.1 differance now. Maybe it has something to do with the actual state of charge of the batteries as against what the system says its state of charge is? Which could be a reason why the voltage differances are getting closer.
The system does not seem to charge up correctly when using the system controller, it goes to float very quickly, when in float it does not maintain a 27v charge but allows the batteries to have a rate of 25v instead. I am wondering if the system controler is faulty in its readings from a perhaps spike caused by a sudden overload with all outputs sucking energy from the inverter as the inverter was being turned on.
I have manually done an equalizer through the charge controllers the charge controllers then go onto a bulk charge. The batteries seems to hold the charge longer, when the equalizer is done through the controller it does not seem to do it properly if at all through the system controller. It just goes to float way too quickly.
Any suggestions would be great,
My batteries are 2v 3000amp wet batteries X 12 = 24V
The system is 3 X Xantrex 4024 Inverters
4 X 60 amp charge controllers.
40 X 190W Solar Panels
In the beggining the batteries would slowly charge up and when fully charged would take some time to dis-charge. I added the solar panels 8 units at a time over several years until 40 panels were installed.
Upon recommendations from the battery supplier (year 2) I added Tin Sulphate and Sodium Sulphate Anhydrous to prevent the cells in the batteries from corrosion. We did this by adding the powder to the acid and water as a slurry then pouring it into the batteries in a measured amount for each battery.
What a bastard of a thing to do, the sulphates are PH Neutral, so the acidity in the batteries go alkaline, we had to keep adding acid mixed with water to increase the acidity of the battery water. The powder would keep disolving inside the batteries over a two year period. We finally got the correct acid reading and now it is maintaining these readings.
I imagine the acid along with the warming of the batteries when charging dissolves the sulphates better. There is probably some sulphates that do not dissolve. This could be causing an issue.
During this period I added a 10 amp hot water system to the system, silly me, when I had all outputs turned on and then turned on the inverter, the inverter made a shunting noise as the contacts closed. From then on the charge controllers and system controller have had 0.2v of difference in their readings.
Through equalisation the voltage differances from the system controller and the charge controllers are getting closer together 0.1 differance now. Maybe it has something to do with the actual state of charge of the batteries as against what the system says its state of charge is? Which could be a reason why the voltage differances are getting closer.
The system does not seem to charge up correctly when using the system controller, it goes to float very quickly, when in float it does not maintain a 27v charge but allows the batteries to have a rate of 25v instead. I am wondering if the system controler is faulty in its readings from a perhaps spike caused by a sudden overload with all outputs sucking energy from the inverter as the inverter was being turned on.
I have manually done an equalizer through the charge controllers the charge controllers then go onto a bulk charge. The batteries seems to hold the charge longer, when the equalizer is done through the controller it does not seem to do it properly if at all through the system controller. It just goes to float way too quickly.
Any suggestions would be great,
