He is not an expert in solar on NBs in UK.
He is, however an internationally respected electrical and electronics engineer, RYA examiner and all the rest of it. There will probably not be another person with his experience, other than Gibbo. .....
I am not easily impressed, he is willing to instal whatever I want, but very few of us have an unlimited budget.
I want best result for my money, I have pretty much spent up my budget on electrical essentials. Also, I would accept a bit less solar if it looks so much better. My original plan was to get rid of the old solar anyway.
I am thinking about connecting a portable solar panel through the existing small controller but using waterproof connectors. I could point it at the winter sun.
I came up with the idea of using the existing panels and roof brackets myself!
It will look better, and I will propose the idea, see what he says. You have to be awre that he is never going to connect his electrics to anything that might catch fire.
Solar panels are cheap, but they need to be fitted.
I bought a kit sans brackets, 2 x 275W with matching wiring and controller.
I bought 3 x 135 AGM, there are two others in the domestic bank.
I have done an audit, near enough my [unlimited] mains usage, though I do use marina washing machine.
I might get one of these.
https://smile.amazon.co.uk/Battery-Monitor-Voltmeter-Motorhome-Lead-Acid/dp/B07CTKYFTG/ref=sr_1_2?keywords=battery+monitor&qid=1583752041&sr=8-2
I would like to get this
https://www.asap-supplies.com/victron-blue-smart-charger-122042022
I don't want the smart part, but it matches my invertor.