Solar system advice

[Sailing newbie selsey]

Can I please ask for some advice, I am looking to add some solar panels to my boat, I have had her for a year and last year on the swing mooring the batteries did not get a full charge, hence the addition of solar for this coming season. I plan to renew and update navigation, radar AIS etc over the next couple of years, so although the solar i am thinking of adding will be an overkill for the systems currently, I am thinking you can never have too much power.
I have two batteries onboard a starter battery at 85ah and a house battery at 105ah. They are on a three way switch and independent of each other.
I plan to install two 100w panels in parallel which are these
https://www.amazon.co.uk/Reno.../dp/B07HR6RSB9/ref=sr_1_1...
As far as controllers I am looking at this dual battery MPPT contoller https://www.photonicuniverse.com/.../648-High-efficiency...
my question is what gauge wire do I need from panels to controller, looking at using Y connectors to wire them in parallel. Also what wire guage from contoller to each battery?
my second question is I want to put an inline fuse between positive terminal of each battery and the MPPT controller is this suitable and if so what size fuse should i use? https://www.amazon.co.uk/All.../dp/B00904N85G/ref=sr_1_3...
would the same inline fuse work in the postive cable after parallel conection is made from panels going to the controller this will enable me to isolate the panels if needed, what fuse would you recommend for this one?
many thanks in advance

 

[PetiteFleur]

With Photonic Universe equipment you'll find all the info in the manual, I think you can also get the info from the website, or ring them up - they are very helpful. From memory the cable will be either 4 or 6mm sq. Wago connectors are good and reliable. Their panels are good quality too.

 

[RJJ]

Wiring (1) likely to be specified in the specs for the panels (2) specs for the controller. The latter you can broadly calculate based on (amps=watts/volts) so 200W at 12V gives you around 20A for the wire and circuit breaker with a little to spare.

My controller, which is pretty standard, has a fuse in-built that protects the run from the panels. There's no reason you couldn't have a pair of breakers to isolate the individual panels if you wish, however a fuse or breaker is only specified for the run to the batteries.

I found the panels outperformed their stated wattage, tripping the 30A controller/battery circuit breaker which was most inconvenient. So I upgraded the specified 30A circuit breaker (and equivalent wiring) to 50A; no problems since. That's for 320W of panels.

 

[Ningaloo]

The cable thickness will depend on the distance. There are some good calculators online that assist in calculating what you should use. Photonic are also usually pretty helpful.
Have you considered connecting the panels in series to increase voltage and reduce current which will require thinner cables from panels to controller? This is only recommend if the panels will not be shaded however.
Also your stater battery is likely to have minimal discharge if you only use it for starting the engine as it will quickly recharge once the engine is running. You might simply your installation by just contacting the solar to your service battery.