so me: sorry for long post. but I feel that all info is crucial to make informed choice.
900 square foot cabin, very drafty... this year gets new siding, insulation and triple pain glass.
MS 4448 PAE magnum inverter charger one, plus spare. spare is wired in but runs parallel but locked out via breakers so not running.
morning star solar controllers x 4 (two online, two spare once again locked out via breakers)
total array size is 7.2kw with 8 panels (1600 watts) facing west vertically to lengthen out solar production day.
DIY battery pack consisting of 2p16s x two for 40 Kw
4 daly BMS, 2 online 2 spares. (on shelf)
backup 3 phase 10 kw denyo diesal generator
A/C split pack (mitsubishi 12 tatami room size) I am not sure of BTU's as i sized it against space I wanted to dry/cool. It runs 24/7 during the rainy months, and summer
sewage pump runs 24/7
one 260 liter fridge runs 24/7,
one 200 liter freezer runs 24/7
all LED lighting
1600 sqaure foot shop all lighting is 240 volt LED and power tools are mix of 120 and 240 split phase
1600 watt kotatsu (radiant heater) x 2
two forced air keroscene heaters for winter,
hunter ceiling fan
1000 watt microwave
on demand propane hotwater heater.
without dragging up stats from the inverter and the solar controllers I can simply say I have not used the genset over the past 18 months for any reason other than to use my welder, compressor, or automobile lift. the lowest my batteries have seen was about 40% after the panels were snow covered for 4 days. I do not live here 24/7 yet. I am there every weekend though, friday night through sunday night. the A/C does run as above 24/7 from mid May through late September to keep the cabin dry and mold free.
all appliances are the equivalent of energy saving appliances for the US.
figure out what you need, what you can do without and remember saving energy is cheaper than making it.
I look at my energy monitor constantly not because of issue but due to my OCD.
I lost one inverter about 2 years ago due to a lightening strike along with my freezer. I fixed this issue with lightening arrestors from midnight solar. other than that minor tweaking of the system as i slowly gain more confidence in the Lithium batteries. I originally ran AGM's for about 4 years and toasted them due to lack of absorb time... go straight to liFpo4 to avoid this issue.
Daly BMS's wee problematic at first, recent updates to software and the actual BMS's have solved these issues for me, YMMV
I am affiliated with no one sales wise, so other than my system works well for me I can say nothing else.
I advise to not pay someone to do this for you. Why? If you do not understand the system yourself you will have no clue on if they did an actual solid job on the install and equipment selection. at least hand out here long enough to come to grips with the equipment so you can trouble shoot yourself in the future. Maybe pay someone for the actual grunt labor but sit down study and design the system yourself.