hi
we live in the era of exaggeration...i tried last days to study how pwm controllers (commercial units) are build and what logarithm they use to charge the batteiries
not to mention that many of these units are not even a pwm ...some are just on off controllers ..a mosfet switch on allow panel to be perfectly parallel to battery
and that is it the panel will act as current source to charge the battery ..when battery is full the controller open the fet
some are really pwm but they are not 3 stages ...3stage pwm charge is perfect to maintain batteries integrity 3 stage charging first start by "bulk stage "
allowing panel to be in parralel with the batteries till predefined voltage level ...after that it switch to pwm ...while watching the current draw from panel to batteries
when it is a predetremind low level the switcher change to float mode ...in this mode the voltage level will be lowered to known
some level and stay there (pulsing from time to time)
some pwm out there despite the fact they they are really pwm but they do not apply this charging method
all they do is to pwm it at 100 duty cylce "that is for bulk" and then pwm at much lesser duty cycle till the battery reach certain level and then it just quits
that literally not 3 stages charging plan....the change from bulk to pwm ..is ok but pwm should stay till current draw from battery drop down
and then it should go to float mode not quits??
not to mention mppt controllers who are sold as mppt yet it dont have the current gain not it have that bulky coil inside the unit
here is schamtic for the pwm diy type (normal pwm not 3 stages..bacause i cant see current measuremnt...and the man who make this diy confess it so no blame on him since
he is giving it for free but those who recieve the $ are to be blamed ) ...i really wanted to master the art of recognising and tearing controllers down and scoping them to discover
whether they are really pwm or not and if they pwm do they have the 3 stages charging mode or not and how they manage to to measure current to switch from pwm mode to
float mode ??links shcmetics of real pwm commercial controllers and real 3 stages ..pdfs manuals all is welcomed thanks for all
we live in the era of exaggeration...i tried last days to study how pwm controllers (commercial units) are build and what logarithm they use to charge the batteiries
not to mention that many of these units are not even a pwm ...some are just on off controllers ..a mosfet switch on allow panel to be perfectly parallel to battery
and that is it the panel will act as current source to charge the battery ..when battery is full the controller open the fet
some are really pwm but they are not 3 stages ...3stage pwm charge is perfect to maintain batteries integrity 3 stage charging first start by "bulk stage "
allowing panel to be in parralel with the batteries till predefined voltage level ...after that it switch to pwm ...while watching the current draw from panel to batteries
when it is a predetremind low level the switcher change to float mode ...in this mode the voltage level will be lowered to known
some level and stay there (pulsing from time to time)
some pwm out there despite the fact they they are really pwm but they do not apply this charging method
all they do is to pwm it at 100 duty cylce "that is for bulk" and then pwm at much lesser duty cycle till the battery reach certain level and then it just quits
that literally not 3 stages charging plan....the change from bulk to pwm ..is ok but pwm should stay till current draw from battery drop down
and then it should go to float mode not quits??
not to mention mppt controllers who are sold as mppt yet it dont have the current gain not it have that bulky coil inside the unit
here is schamtic for the pwm diy type (normal pwm not 3 stages..bacause i cant see current measuremnt...and the man who make this diy confess it so no blame on him since
he is giving it for free but those who recieve the $ are to be blamed ) ...i really wanted to master the art of recognising and tearing controllers down and scoping them to discover
whether they are really pwm or not and if they pwm do they have the 3 stages charging mode or not and how they manage to to measure current to switch from pwm mode to
float mode ??links shcmetics of real pwm commercial controllers and real 3 stages ..pdfs manuals all is welcomed thanks for all
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