CLASSIC 200 Connections

[TONYF]

Hello Guys

Hope you are all well.  I had my small system for some time.  Once it starter working I lefted there. Didnt bother to keep up to date.

My lead Acid batteries where going bad after many years of use (backup use)

Equipment:9 Solar Panels 3 strings
200 Classic
WHizBang Jr.
Batteries (4 x 6v 420a =24v)
Aims 5k




Anyways I have a Classic 200 and by l was given a bank of 4 x 6v 420ah Carbon Led Batteries which I connected in series for to use my 24v Aims Inverter. 

I upgraded the firmware on the classic to the latest version (not the test version) entered all parameters as per mfg specs.

I have newb questions:

1. Do I need to limit the current going into the battery bank?. (battery recommended is 45 amp and Max is 105 amps. Classic max is 79amps

2.In the classic internal bus bar it has - PV and -BATT    In my scenario the -PV lead from PV Array is connected to - PV of the internal bus bar  and the -BATT lead from CLASSIC connected directly to negative of the battery.  (Is this correct?)

I read the manual and there is a negative bus bar and it looks like is connected/attached to the shunt, in that bus bar the -batt lead from the Classic and -PV lead from the PV connect. (my shunt doesnt have additional screw holes to add a busbar directly to it.  Any Suggestions?

Hope you guys can shine some ideas and help me correct this.



Thanks

[ClassicCrazy]

answer to some of your questions.
1 Go to the Midnite String Calculator and enter your PV data and it will tell you how many potential amps your pv will generate and you can use that to determine if you need to limit charging amps. But if you limit charging amps it will also limit the amps provided to loads. There is a way to get around this where you can limit charging amps but still let the Classic supply as many amps to loads as possible. In general you usually don't get the rated power out of pv so you might not need to limit charging amps . Depends on many factors of your setup.

2 In  the Classic the PV negative and the Battery negative are connected together . For a shunt you will have only one side of the negative going to the battery. On the other side of the shunt will be all other negatives for your system. You didn't mention if you have a Whizbang on your shunt ?  Look up info on Midnite site about Whizbang for more info and what they look like ( a small circuit board with purple wire going to Classic )
Look over this info too
https://www.midniteftp.com/support/kb/faq.php?cid=1
Larry

[TONYF]

Thanks for the reply. 

1 PV Array power 2789, batt charging current a 28.8v 96.9 amps

The classic 200 max allowable output current 74 (the batteries recommended is 45 amps but the max is 105 amps.

2. Yes I have a whizbang Jr.  Configured and the Classic is getting the info.

3.  The negative wire of the batt bank is connected by itself in the whiz/shunt and in the other side the negatives for system -PV Classic -batt -inverter.

(I corrected the classic negative batt wire and places it to the other side of the shunt/whizbang