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Brilliant I'll draw it up. Yes there is a double poll switch on solar wire, forgot to draw that lol

I got the mppt tracer 40 solar charger. I'm setting it up in my RV now. I have a 4000w inverter but I'm not sure what wire/cable size to use from that to the original fitted 240v consumer unit. I want to power the original electrics. (Without wire melting)

Ok thanks. I'll calculate it. Thinking a bigger cable than 4mm tho? 4000-12000 inverter. RV has a washing machine, coffee maker and disability aids and scooter to power.

Ok re drawn the way it will be in the RV.

I haven't worked out a max load for 12v fuse box. At mo it's just for USB's,. I need to work out if I can run a wire from this set up to the original fitted 12v system and 240v consumer unit it. I have an idea.

I plan on adding another 2 batteries at least. I will be running the generator for the washing machine (0.95kwh per cycle) then, think that's best option. The rest is a tassimo coffee machine (1300w), laptop charger, tv (45w) mobile phones etc.

For the inverter I need to use the 250amp fuse. Does that replace the 50amp between the inverter and batteries?

I'm useless at tech stuff. But a clearer picture now. I'm not sure why the shunt is up away from the batteries tho?

I have the Mppt tracer 4215BN 40a. 4000w inverter. 5A 60W DC 24V To DC 12V Step Down Converter Regulator. 2x 275w solar panels 2x 140ah deep cycle batteries. 12v fuse box. I'm in th United Kingdom and need to get the correct gauge wire and circuit breaker. I think your 6 gauge is 4mm and 0 gauge...

Thank you. The inverter is Power Jack 9.0 Low Frequency-4000W Pure Sine Wave Power Inverter DC 24V to AC 220-240V ,Max 12000W

I'm new to this and not sure of calculations. I've got 2x 275w solar panels going to a tracer mppt 40. To the 4000/12000 inverter. Then to 2x 140amp batteries in 24v. I want to power the RV's original consumer unit for 240v.