using amps in and out regulation on classic

[zoneblue]

The limiting factor I have is  the DC breakers in and out of the Classic  being 63amp, and also that I wish to limit max DC going into the batteries. ... you get "cloud-edge" effect ...With that, it  could easily pump 80 amps from array -- and that would be too much. So  this is what I use  the current limiting feature  -- basically to shave off  transitory peak amps.

Id tend to be a litle careful with this if your classic breaker in the din rail kind. They are of necessity in kinda backwards, positive to the battery, if you trip it with a controller overload it will reverse trip which wont be pretty. However those breakers are duty rated ie theyll carry their trip amps indefinately. But how long a 60 amp breaker would take to trip at 80amps you need to look at the tech specs or ask bob.

Another thing, MPPT controllers use by definition a sweep type of regulation that isnt absolute. You cant guarantee that sudden sun changes wont cause off regulation type output surges. Batterys are tough and dont mind that sort of thing, but issues have from time to time shown up in systems with very large panel to battery ratios, where over charging occurs as a result of this issue.

Hence what im getting at is im not sure how the current limit feature works, whether its a hard limit of more of an average kind of thing. Again bob will know.

[boB]

The Classic current limit works on average current so if your current shoots up because of
edge of cloud, it may take a second or two to back down.  But edge of cloud is not
instantaneous anyway so it should catch that pretty well.

If you abruptly connect a large PV array to it, then it may give you higher current
for a bit longer but that doesn't happen all that often.

There is also hardware over-current protection so connecting Hoover dam to the
Classic should also be pretty much taken care of but still...   be semi careful with
fusion and fission energy.

Also, the 250 and 250KS has additional peak responding current limit in software so
it may respond somewhat faster in some instances than the 150 or 200 Classics.

boB

[mtdoc]

be semi careful with fusion and fission energy.

Hey waaaiiit a second......  What about that fusion energy coming from 92,960,000 miles away.......


BTW - I've found my Classic's amps out limit to work very well. Even with rapid cloud edge effects/transient spikes.

[zoneblue]

BTW - I've found my Classic's amps out limit to work very well. Even with rapid cloud edge effects/transient spikes.

Interesting. To see this, have you been able to monitor the transients somehow ?

[boB]

be semi careful with fusion and fission energy.

Hey waaaiiit a second......  What about that fusion energy coming from 92,960,000 miles away.......


BTW - I've found my Classic's amps out limit to work very well. Even with rapid cloud edge effects/transient spikes.

Yes, the Wireless Transmitted Fusion from the generator 92 M Miles away is what I was talking about.

If you have a large WTF  receiving antenna pointed at the transmitter source and suddenly connected it up
to the receiver (Classic) you will get an input surge.  Just make sure that antenna isn't capable of
supplying like, 100 megawatts to the Classic or you will see the light !!

boB

[mtdoc]

BTW - I've found my Classic's amps out limit to work very well. Even with rapid cloud edge effects/transient spikes.

Interesting. To see this, have you been able to monitor the transients somehow ?

On bright - mostly sunny days with large cumulus clouds moving across the sky- I've watched on the local app as the amp limit kicks in with a cloud edge induced spike in PV output. 

When I added my second arrray it put my total nominal PV wattage at 4.5K.  Since I sell back to the grid and my inverters  rated continuous output is 3.6K, I was worried about overloading it and nervous that the Classices amp output limit would not be dependable enough to count on. After watching it on several such days - my fears were put to rest.

[laszlo]

mtdoc -- right on. I have been using the current limiting feature for several years, in the method I described above.  It's sea-worthy.

Regarding breaker polarity - the Midnite 63amp  DIN breakers  from South Africa do observe polarity. You need to wire them to have the greater potential electrical source come in from bottom terminal.  Read the Classic manual and the Midnite website on this.