They have been going for around $1150 to $1200 on either signature solar or NAZ solar websites. The freight shipping goes from $300ish depending on your situation. My last one was $1140 + $299 shipping from NAZ. I should have just ordered it with the original 2, but couldn't help myself.
Each inverter can do 6800w continuous, 8000w for 30 minutes, 10000w for 10 minutes, and 12000w for 1 minute. Even at 12kW the sine wave is stable and clean. They do weigh a ton so you either need 3 man lift or a block-n-tackle, or electric hoist to get them on the wall.
They require an insight home device to program them. The insight facility may be used instead or the older SCP used on the SW line of products.
Optional -
- PDP - full or half sized - this contains breakers and everything to interface the box with your house -- price things separate and it comes out close. Half sized can only be used with one inverter. The full sized can bring 3 inverters together.
- BCS - Backup control system - this has a 500amp ATS and a Wattcycle in it along with spots for main breaker and non-critical breaker. You use this to interface with the grid if you want to sell back. You can do it without but this makes it simpler.
- Expansion kit - if you buy more than 1 inverter - this has the cables and DC breaker for connecting things to a full size PDP - It is also the wireway for under the inverter to connect everything together. It has separate wireways for the Xanbus wires to keep them away from your AC/DC wires.
- Breaker kit - this is 3 x AC breakers and interconnect plate to do bypass with 2 inverters - needed for inverter #2 if using a full size PDP. With the 3rd inverter this totally optional
- MPPT - they are high voltage isolated type and are great for string of larger panels - start voltage is 190v and maxes at 550v. They can take 600v with no complaint and will not actually fry until you hit almost 690v from the directions. At 550v they go into shutdown until it goes lower.
- Battery Monitor - this is a 500amp shunt that speaks Xanbus to the inverter - I am using Victron for this purpose without the inverter connection.
- Genstart - this will auto-start the generator if the batteries get low - using victron is simple to do.
You can skip all the optional items and do your own thing by just hooking the wires up, but the prices are within $50 if you do all the same things.
The inverters are built like a tank and should last 20 years.... and once installed unless you are a fiddler you don't need support or code... Just use the batteries openloop. There are people using the EG4 batteries with communications - same deal - once installed they are fine.
So, IMO
Are they worth it - YES
On or off grid - YES
Quality wise they are on par with Victron.