Brief Notes/Background information on MPPT Task
11 segments - number on sides give the cell counts
as long as mppt is less then output it will boost
check the datasheet to know the turning angle for pot
Pot 1 → Will describe the reference for boost
Pot 2 → Uses the reference but is the boost factor
Mppt per segment of array
18-33Volts (per unit) (should be good based on MPPT)
We don’t want all in series because it is worse bang for buck
Current configuration 5 in series parallel with 6 in series
All in series because the output is input for next
Same reference all mppts need to be above potential battery can be at (98-154V) Rount to 160 so that the 5 mppts can cover 160v and the other 6 can do 160V.
Configure mppt by turning pot 1 and pot 2 (basically look through the documentation to figure out how to turn the pots to get to these voltages)
ask micah black about nominal volts
megawatt peak of 3.72Watts nominal voltage is about 0.6V
max input is about 29V which means mppt will always be boosting
Spy will tell us voltages and temperature
ME1 cells (ask what type of cells we are using)
TO DO
verify output nums with micah black and boosting volts
Ask Catherine or Michael Shiozaki about cell nominal and any data sheets (a little confused about this)
figure out from data sheet the optimal pot 1 and pot 2 angle for expected out
Talk to Josh about about testing mppt out with power supply by varying it based on expected volt to reference of cells
Documentation/Progress of task
Confirmed Numbers with Michar (~150 is good)
Have data sheets (still to look through for cells)
Min 1.1 to 1.15 boost
Pot has 11 turns
To look through the svn102 chip stuff
*Currently a little confused as I’m not sure how to figure out how much to turn the pot. We know that the right array should be boosted to 32V and the left to 26. The nomura does a minimum boost of 1.1 to 1.15 boost. I checked the data sheets but couldn’t find a specific ratio for effect of changing the pot.