6kW AC photovoltaic box with backup protection

[RCZ]

I posted this in the wrong place…sorry…I’m getting a lot of comments about the inverters compatibility….its sold by a French solar kit company and is ready for installation without the need to switch jumpers to make it compatible with France. The only connections that need to be made are to the sockets at the bottom of the unit. It has two AC outlets…one for the grid consumer unit and one for the emergency power in the event of a power cut. I don’t see anything difficult about that! The AC box with backup is no different to those I’ve seen in the uk…it will have two inputs from the inverter and two outlets…I just need to know where they go. Please don’t preach or criticise, my post is directed to those that may have done this…

Hi guys…long shot…but I thought I’d try….does anyone know how to wire this up…I’m getting an inverter that will supply the grid consumer unit but in the event of a power cut, it will disconnect the grid side and supply critical power to this box. I believe the grid side goes to the top rail and the critical side goes to the bottom rail. When the grid power is cut, a switch in this box on the top rail cuts the connection to the grid side and switches solar power to the critical bottom rail. It would really help me understand this better if someone knows where to make these connections…where do the inverters AC grid and AC load go in the box, where does the main consumer unit connect to and where does the critical load come from on the bottom rail…hope someone can help…thank you..Mike

 

[Adam_151]

Looking at that drawing, 1 and 2 are the grid supply from the normal DB, 3 and 4 are the grid tie output of the inverter
5 and 6 are the essential supply comming from the UPS, and 7 and 8 are out to the essential DB.

The panel doesn't do a lot, it provides type B RCD protection to the grid tie inverter, and overcurrent protection plus RCD to the esstential board, as well as pulling neutral of the essential board down to earth in the event of a mains failure so you are not running with a floating system*.


*Im not overly keen on that, if the coil fails the N-E bond would be in place when the mains supply is connected which is not ideal, I think I would have used a 2NO+2NC contactor disconnecting the supply out to the UPS/inverter when the link is in place, but perhaps that would be overkill.

P.S. I think I've learnt a few french words after chucking the labels with google translate to verify my initial thinking!

 

[RCZ]

Thanks Adam….you are obviously way beyond DIY! Thank you for responding…I’ve identified the units in the box…and they match up with the photo of the box circuitry….i don’t think I’ve made any errors but if you could take a Quick Look and confirm it is what you said…thanks…

 

[RCZ]

The numbers you stated are actually on the connection blocks in the box….didn’t notice them….

 

[RCZ]

The numbers you stated are actually on the connection blocks in the box….didn’t notice them….

 

[RCZ]

Adam could you please explain how you know it’s a floating system…..

The panel doesn't do a lot, it provides type B RCD protection to the grid tie inverter, and overcurrent protection plus RCD to the esstential board, as well as pulling neutral of the essential board down to earth in the event of a mains failure so you are not running with a floating system*.

What is it in the diagram that’s telling you that…I’m having to fill out a form to get certification to use the system…it’s a real pain but I remember you saying this and it could be very relevant…..Mike