My off grid set up on the Island is as follows.
Using 8 PV 320W panels, which is enough for us while we are still building. Bought 36 panels as I was going to overpanel my set up due the weather/lack of sunshine. We are just north of Seattle in Vancouver area.
Using 6 Tesla S batteries and have 2 more in my crawlspace. Each battery has 5.2Kw of energy stored and is 25.2V.
Have them configured to be in a 48V for my Inverters, capacity is 31.2Kw.
This capacity allows me to have 8 guys working, table saws, chopsaws, air compressors, jack hammers, vacuums etc and have two fridges and freezers working at all times. No issues what so ever. It's like we are on grid.
The PV charge controller is set up so that it wont overcharge the batteries. This is critical along with a BMS made specifically for the Tesla S model batteries. The Inverters are also set up to ensure any charging is limited to not overcharge the batteries.
By using the S batteries we can make them last much longer than was specified.
One charge cycle is typically 100% to zero then back up to 100%.
We are set up to charge up to 90% then down to 15% then back up to 90%.
What this does it allows more cycling of the batteries. Eg stock set up 3-4000 cycles, my set up over 10000 cycles.
Hope this wets your appetite.