105kWh ESS (WOW!)
{I guess I am half way there, I too am planning on about 100kWh storage, I have been adding a 14.3DIY rack each spring and each Fall, two more years and I will be there!}
With your 16kW of PV you could basically fully charge your whole ESS in 6-8 hours of good sun even from near zero battery SOC, NICE!
I have been thinking about a battery to PV ratio, based on say 5 good solar hours a day.
It seems that ESS(kWh) : PV(kW) of 5:1 makes good sense for a lot of set ups.
your 105kWh battery: 16kW PV is about 6:1 Seems to make good sense/works for you.
I realize some of the guys are in much hotter areas (Tx, Az, Nv So-Cal) and as such they can use a lot of their solar power as it is created, just running A/C while it is sunny out, without the need for large ESS perhaps.
Here is my general 'rule of thumb' quick guideline:
Starting with an energy audit, a system can be sized to meet the max instantaneous output(kW), and the daily consumption(kWh) (d-consump)
From this max instant output (and budget input) a suitable sized inverter(s) can be selected.
Next an assessment of how many days of automy, (d) x (d-consump) will provide a total ESS battery size.
Next using my 1:5 ratio (or Preppenwolf's 1:6) the PV can be scalled to suit the above.
Lets' run some numbers and see what happens.
A typical whole house is using say 26kWh/day and has a peak instant load of say 13kW
The user is on a bit of a budget and decides to go with a pair of MPP 6548's to get the 13kW instant max output at low cost.
Say they select 5 days of autonomy so 26kWh/d x 5 = 130kWh ESS
Using the 6:1 ratio this leads to a PV size of 130/6 = 21.6kW of solar panels.
What if it was a small cabin kind of set up:
Say daily use is only 3kWh/d and peak is 2kW load, all 120V loads.
The user picks a small 2-3kW inverter
Again lets pretend they need 5 days autonomy so 3kW x 5 = 15kWh ESS. (three 100Ah 48vdc racks).
Using the 6:1 ratio, 15/6 = 2.5kW of PV for the cabin. like 6 400W panels.
This ratio of PV to ESS would seem way too high at first look, after all do we need to be able to fully charge the ESS in a single day? but then we need to realize the PV typically don't output near to their rated max often only 70-80% of that, less if there are clouds, and then as Preppenwolf said - there is Dec-Jan.