mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
If someone wants to web search for comparison data
They would do well to stick to sites dealing with off grid small installs
Ignore anything to do with grid tie
Equipment sellers love paper data, it closely corresponds to grid tie use
RV installs, simply do not represent the efficiency and paper gains, that equipment MFG and sellers want to advertise, they want the big bucks residential grid tie market
If I ever repair my blue sky 2000e
I might rewire a couple of my panels in series and try it out .
two of my panels in series are above. The stated voc of the 2000e, so I always ran them in parallel mode, now that the Xantrex C40 is installed
I can test the blue sky with a series pair, when I get around to repairing it
So far the C40 is doing better than I expected and about par with the 2000e for daily winter output, will see what happens as the days get longer and spring gets here
Personally until I have my own tests , I will go with the opinion that series panels early morning and lower irradiance wake-up, offset any possible minor efficiency loss compared to parallel panels
Any real loss efficiency of series is going to be do to shading issues reducing the output of the string, and that will depend on panel design regarding bypass diodes
BTW.. for real world RV use from a full-time RV solar user
Check out this thread of mine More solar for us
I don't update as often as I used to, almost daily for the first two years
But it documents the install and use, recording solar yields
Sunny hot cold wet dry foggy overcast traveling and parked year round recorded dated.
I log my solar in a daily planner, everyday, even when not updating the thread
Yesterday Monday Jan 12, yielded 76.0 8 amp hrs...1015.1 watt hrs
Saturday Jan 10, 29.34 amp hrs...383.9 watt hrs rainy and overcast
505 watts, thin film , frame mounted flat on roof
Website charts and numbers would say I should have had a total of about 5 hours of my panel value or 2500 watt Hrs
Yeah in my dreams...Maybe on a Grid Tie system tracking the sun...Maybe
They would do well to stick to sites dealing with off grid small installs
Ignore anything to do with grid tie
Equipment sellers love paper data, it closely corresponds to grid tie use
RV installs, simply do not represent the efficiency and paper gains, that equipment MFG and sellers want to advertise, they want the big bucks residential grid tie market
If I ever repair my blue sky 2000e
I might rewire a couple of my panels in series and try it out .
two of my panels in series are above. The stated voc of the 2000e, so I always ran them in parallel mode, now that the Xantrex C40 is installed
I can test the blue sky with a series pair, when I get around to repairing it
So far the C40 is doing better than I expected and about par with the 2000e for daily winter output, will see what happens as the days get longer and spring gets here
Personally until I have my own tests , I will go with the opinion that series panels early morning and lower irradiance wake-up, offset any possible minor efficiency loss compared to parallel panels
Any real loss efficiency of series is going to be do to shading issues reducing the output of the string, and that will depend on panel design regarding bypass diodes
BTW.. for real world RV use from a full-time RV solar user
Check out this thread of mine More solar for us
I don't update as often as I used to, almost daily for the first two years
But it documents the install and use, recording solar yields
Sunny hot cold wet dry foggy overcast traveling and parked year round recorded dated.
I log my solar in a daily planner, everyday, even when not updating the thread
Yesterday Monday Jan 12, yielded 76.0 8 amp hrs...1015.1 watt hrs
Saturday Jan 10, 29.34 amp hrs...383.9 watt hrs rainy and overcast
505 watts, thin film , frame mounted flat on roof
Website charts and numbers would say I should have had a total of about 5 hours of my panel value or 2500 watt Hrs
Yeah in my dreams...Maybe on a Grid Tie system tracking the sun...Maybe
