Have a few questions about wiring my setup.
I have the following components which I am having just a slight issue with.
xw6048 inverter.
dual classic 150's
midnite epanel.
and midnite combiner box 12 breaker lv model
The system is totally offgrid and will have a generator backup.
Ac side of things are fine, and AC neutral and the Ground Bars are bonded.
Really where my questions comes in is connecting the dual classics.
The connections to the batteries are simple. I think I understand how it should be but would be nice to see it in documentation about dual classics, I may have missed it somewhere.
Connecting of the PV circuit from the combiner, to the charge controller is where I am wanting some confirmation. I am connecting the pv + (on classic) to the breaker (in epanel). Now in the diagrams it shows the other side of the breaker connecting the PV+ BAR(in epanel). This is where I am having issue. I will be running 2 classic 150's and so voltage and amps on the PV+(epanel) would vary if I hooked both up to that bar. I was thinking of skipping the pv+ bar(epanel) and going straight to the PV+ bar in combiner box(from breaker in epanel). In the combiner box I have 2 seperate PV+ Bus bars. How should I handle this? I am correct in my thinking?
While we are in the combiner box I have a question about the PV- BAR. I am thinking that I can use just a single cable and go from PV-(combiner) to PV-(epanel).
Last questions is for the Classic 150's PV- slot. After reading the manual it appears that I can just hook either pv- or battery- . If I am going to hook just one of them up, I will need to bridge/bond (in the epanel) pv- to battery- BARS. Is there any difference between bonding the bars or running both negative wires to the Charge Controller?
All of this is for a system located in Mexico. There will be no electrical inspection, but would like to leave the system in good shape.
Thanks for any help that can be rendered.
Matthew
i'll take a stab at this. the pv plus is meant for the pv input for the use of a single controller. it is a stop gap so that one would not have to run wires all the way through the epanel and into the controller. if one were to be placing 2 strings into that single controller it could be done at the pv plus bus. more than 2 requires fuses/breakers and then that would be combined and then taken up to the pv plus point. it keeps the wiring to the cc simpler and far less aggravating trying to navigate the wiring in the epanel should you make changes to the array.
the complication is you are running 2 classics and if they are both mounted to the epanel then you would want a 2nd pv plus bus bar for that controller to keep the internal wiring simple and neat. a 2nd would be mandatory as one does not share pv arrays on the input to 2 separate controllers and pv systems so the only common point between the 2 controllers will be at the output to the batteries. so where to put the bus would be the lower right hand side below where pv plus and pv minus buses lay. the original pv plus can be kept as the pv connection point for the 1st classic and the new bus can be the pv connection point for the 2nd classic controller. wiring will then go from the pv plus inputs to their respective classic controllers keeping the wiring neat.
all of what i said is out the window if you have the controllers mounted elsewhere other than on the epanel as then that pv plus can be utilized as a combiner bus for the + battery outputs of the 2 classic controllers. it isn't necessary to wire the 2 classics to that pv plus bus as i'd then go straight to the battery plus bus as the added step to the pv plus bus is unnecessary at that point.
remember when using more than 1 controller that the systems are separate systems only up until they go to the battery. they come together at the battery and both controllers should be set identically for the battery. this means that no pv should see or be connected to more than 1 controller. i realize that you will have more than 1 battery so consider where i said battery to mean battery bank.
i hope i answered this right or didn't mistake your question.
Yes niel,
That is kind of what I was thinking. Thanks for the confirmation. Just wanted to make sure.
Matthew
Also, don't forget to observe the breaker polarity. There is a + sign on the OB/MN breakers that is supposed to be oriented toward the source with the highest potential - there is a good writeup on this from Robin in another thread.
Quote from: animatt on September 24, 2011, 10:00:07 AM
Have a few questions about wiring my setup.
I have the following components which I am having just a slight issue with.
xw6048 inverter.
dual classic 150's
midnite epanel.
and midnite combiner box 12 breaker lv model
The system is totally offgrid and will have a generator backup.
Ac side of things are fine, and AC neutral and the Ground Bars are bonded.
Really where my questions comes in is connecting the dual classics.
The connections to the batteries are simple. I think I understand how it should be but would be nice to see it in documentation about dual classics, I may have missed it somewhere.
Connecting of the PV circuit from the combiner, to the charge controller is where I am wanting some confirmation. I am connecting the pv + (on classic) to the breaker (in epanel). Now in the diagrams it shows the other side of the breaker connecting the PV+ BAR(in epanel). This is where I am having issue. I will be running 2 classic 150's and so voltage and amps on the PV+(epanel) would vary if I hooked both up to that bar. I was thinking of skipping the pv+ bar(epanel) and going straight to the PV+ bar in combiner box(from breaker in epanel). In the combiner box I have 2 seperate PV+ Bus bars. How should I handle this? I am correct in my thinking?
While we are in the combiner box I have a question about the PV- BAR. I am thinking that I can use just a single cable and go from PV-(combiner) to PV-(epanel).
Last questions is for the Classic 150's PV- slot. After reading the manual it appears that I can just hook either pv- or battery- . If I am going to hook just one of them up, I will need to bridge/bond (in the epanel) pv- to battery- BARS. Is there any difference between bonding the bars or running both negative wires to the Charge Controller?
All of this is for a system located in Mexico. There will be no electrical inspection, but would like to leave the system in good shape.
Thanks for any help that can be rendered.
Matthew
;)