Time for new panels...

[megatexture]

should have got a ctek ... connect 4 wires and your done lmao

[the evil twin]

should have got a ctek ... connect 4 wires and your done lmao

ROFL... now you tell him

[mudski]

ROFL... now you tell him

I'm not ROFL'ing...
You have explained how to switch between chargers, Cuppa's enligtened me on switching between dc-dc and solar on the BCDC. The only thing now thats got me is how to get the ignition wire over to the relay.

[Yendor]

Does your vehicle already have the charge circuit wired down the back? If so how is this wired? are you currently using a smart solenoid? do you have a second battery under the bonnet? if so how is this wired regarding the smart solenoid?

Are pins 2 & 5 used in your trailer plug?

[the evil twin]

snip...
The only thing now thats got me is how to get the ignition wire over to the relay.

Wireless?
Blutooth?
Wormhole?

Sorry, couldn't resist...

The reason for the Changeover relay is to stop the BCDC from discharging the Cranker.

Put a VSR in place of the Relay, more expensive than a changeover relay but no ign wiring req'd.
Vehicle running - VSR allows circuit to the BCDC
Vehicle stopped - VSR will drop out when Cranker voltage drops below set point and BCDC will have no input other than Solar if connected

[Cuppa]

mudski my old fruit, sorry if i 'sounded' frustrated, words alone are not the best medium for conveying mood. I assure you there was no frustration, i was just trying to explain the reason for the changeover relay in Redarc's diagram.

Yes, i did mean fixed, as in permanently mounted. As you are not intending to have permanently mounted panels, the automatic switch over would not be of much value to you. Therefore you don't need the relay at all.
With the bcdc mounted in your camper all you need is a two way switch instead. (Essentially you become the 'human changeover relay' )

From BCDC the red wire goes to the andersen plug. (Crank battery +ve)
From the BCDC the Black wire goes to the andersen plug (crank battery -ve)
When driving, the car is connected to the camper's andersen plug.

When camped the car is disconnected & instead the solar panels are connected to the camper,s andersen plug. So then solar +ve is connected to the red wire & solar -ve is connected to the black wire.

A two way switch is required in the camper on the BCDC's blue wire. When charging from the car the switch connects the blue wire to the red wire. When charging from solar the switch connects the blue wire to the black wire.

two issues with this setup.
1. If you forget to switch over your batteries don't get charged.
2. You should always flick the switch when nothing is connected to the andersen plug just to be safe (ensuring you are not switching with a load connected)

[Yendor]

Wireless?
Blutooth?
Wormhole?

Sorry, couldn't resist...

The reason for the Changeover relay is to stop the BCDC from discharging the Cranker.

Put a VSR in place of the Relay, more expensive than a changeover relay but no ign wiring req'd.
Vehicle running - VSR allows circuit to the BCDC
Vehicle stopped - VSR will drop out when Cranker voltage drops below set point and BCDC will have no input other than Solar if connected

Great minds think a like hey.

He would still need to use the change over relay if he does decide to use the VSR. The blue wire going to the BCDC needs to change from a positive when charging via the vehicle to a negative when charging via solar.

[Cuppa]

The reason for the Changeover relay is to stop the BCDC from discharging the Cranker.

In mudski's camper once switched to solar a different 'earth' is being used, so i can't see how there would be a circuit to discharge the cranker. The relay is only to provide 'automatic' switching between inputs.

[mudski]

Does your vehicle already have the charge circuit wired down the back? If so how is this wired? are you currently using a smart solenoid? do you have a second battery under the bonnet? if so how is this wired regarding the smart solenoid?

Are pins 2 & 5 used in your trailer plug?

Ok. The setup on the car is simple. One cranking battery and one aux battery connected via a Redarc Sbi12 (I think its called). I have an anderson plug down the back connected to the cranking battery. All the seven wires are used in the trailer plug as I have electric brakes on the trailer.
Currently, or how the trailer setup was, is I would connect the solar up directly to the trailers anderson plug, as my current panels have the contoller on the back of the panel. This part I am changing when I get another 12v panel or modify my 24v panels.

[mudski]

So can I assume that I still need the relay for the switching between the mains charger and DCBC??
And, as per Cuppa's comments I don't need the relay to switch between solar and car charging? Just a manual switch? Which I dont mind doing.
I really appreciate all this info from you guys. I could easily just pay an auto lecky to do this but then i wouldn't know how it all works. I still don't, lol but it would be great to actually have a write up with diagrams as a sticky here for others to use.

Thanks.