In general, I would dissuade you from buying a kit, and now especially a Renogy kit, for two reasons.
1) There are rumors that Renogy is about to declare bankruptcy, and any warranty you get with them would go poof. There are LOTS of complaints posted on other solar sites about their non-existent service, and lack of communication. I myself have driven over to the Renogy headquarters in Ontario, Ca. and found their doors locked, and instructions to contact them via email.
2) I started with a Renogy cabin kit myself and over time have found their components to be amongst the lowest performers you can buy.
Don't buy panels or batteries through the mail. For panels, you'll get the best deals on quality panels buying locally. I've bought quality panels off of Craigslist and Ebay, with local pickup instead of shipping. The highest quality, very best performing panels I've bought to date were used grid-tie panels pulled off of someone's roof. Those used Astronergy panels that outperform my new Renogy panels by almost 10%.
For sure go with 24V for a cabin. It's more expandable. You could start with four Costco 6V golf-cart batteries. They are 210Ah. At 24V that's 210Ah X 24V =5040Wh, or 5.04kWh of power. Assuming you never want to drain the batteries below 50% for extended life, that's 2520Wh. Assuming you want to go two days in case it rains, that's 1260Wh each day. Trojan makes a similar T-105 battery at 225Ah. I started with that battery. After 5 years of use, I passed them on to my neighbor, because I upgraded, but they weren't worn out yet.
You'll need to charge the batteries at up to 1/8C, which works out to be 210Ah X 0.125C X 25Vcharging X 1.175 fudgefactor= 771W. The fudgefactor is the compensator to account for the panels never reaching their rated output in real-world conditions. Three 260 grid-tie panels would match well. I bought some 260W panels for a neighbor for 62$ each last summer. 240-250W panels would be just as good. Assuming you only get 2.5 sunhours (SH) of light in winter, that would give you 780W X 2.5SH = 1950Wh of power per day. In summer, expect >5 SH. One string of three panels in series is described by the shorthand 3S1P.
The panels wired in series would be outputting around 90V, but the Voc (open circuit voltage) might be around 114VDC, so that would be higher than what the cheapest low-budget MPPT controllers can handle. The cheapest controllers max out at 100Voc. Take a look at Epever's Tracer5420AN controller. It can handle up to 200Voc. An MPPT controller can take the raw high voltage solar power and transform it down to battery voltage for charging.
https://www.ebay.com/itm/352541593982?hash=item52151dd17e:g:CQsAAOSwuWJbuH2K
Lastly, you will need an inverter for your AC loads. For sure, get a Sine-Wave inverter. A MSW inverter will make anything with an electric motor run hot, and fail prematurely. Samlex makes a 1500W Sine-wave for 520$.
https://ressupply.com/inverters/samlex-pst-1500-24-pure-sine-wave-inverter
They also make a 2000W model for ~600$.
I have this inverter.
https://ressupply.com/inverters/schneider-electric-conext-sw4024-120240-invertercharger
This is a premium brand 24V inverter that provides split-phase 120/240V AC and also has a built in generator charging circuit. You just wire a 120/240V
gasoline generator to the ACin input terminals, and it will accept generator power directly to charge the batteries. So, on a rainy/snowy day, you can start up the generator,
feed the inverter the generator power, and it will charge the batteries. It is designed to be hard-wired directly to your main electrical panel.
Over time, you may want to expand your system. You can replace the golf-cart batteries with larger L-16 off-grid batteries. You can add another panel or three and wire them into 2S2P or 3S2P. If you want to add even more panels, you'd have to upgrade your controller to handle more than 50A of current. For my own 24V system, I have 2000W of panels, wired in 4S2P, but I have a Midnight200 charge controller that can handle higher amps.
Good luck!