Greg's solar power comparison

This page is an attempt to make sense of the quotations I have had for solar power in February/March 2019, mainly from Effective Electrical in Ballarat.

The quotes are really difficult to understand; I suspect that Tomas doesn't either. They also don't seem to match reality. In particular:

It seems that he updates quotes without changing the number; in particular, I now have four different quotes numbered 423. It seems that part of this is simply an update of the same quote, but the two on 24 February seem to be accidental.
Quote 423 of 23 March is the same equipment as quote 423 of 24 February. I had asked for it for his best price for this configuration after quote 487 of 15 March; in fact, it's another $250 more expensive!
What are these things? It's clear that the Ingeteam SUN 1Play-6TL is at least an inverter. But on the quote page (the one I'm supposed to sign), it's not clear what the Fronius 8.2-1 and Selectronic SPMC482-AU are. The Fronius claims to be “the communicative inverter for optimised energy management”, and the Selectronic is advertised as multi-mode inverter, and the gaudy graphics show nothing related to how the pieces fit together.
I'm ignoring the "Battery consumed" on page 2, because it doesn't match anything else.
Energy profile graphs show battery and grid together overnight; should be battery first, then grid.
In some places the Selectronic inverter output is rated at 8 kW, elsewhere at 8.2 kW.
Does kW really mean kW, or is it kVA? Thomas didn't seem to understand the question and talked about amps. He quoted the output of the Selectronic at 63 A, but the quote specifies 8.2 kW, which corresponds to about 35.6 A. If it's kVA, it represents a power factor of 0.57.
Various quotes give different specs for the same equipment. Quote 423 of 25 February gives the net storage capacity of the BYD B-Box Pro 13.8 as 12.42 kWh, while quote 423 (the same) of 23 March gives it as 13.25 kWh.
Clearly the Ingeteam inverter doesn't match up to the Selectronic unit. 6 kW is only 26 A, and I can see that we can easily exceed that load.
Do any of these have Ethernet connections? Tomas says that the Ingeteam does, but that doesn't match the specs.
What does “estimated solar used” mean? The numbers don't add up.
Quotes 423/1 and 487 are almost the same. The price is the same, only the first comes with two battery packs, and the second only has one pack. Why should the price be exactly the same?
I had also asked him for an explanation why the new quotes were so much higher. I didn't get one, but maybe he doesn't have a good answer.

I'm left with the distinct impression that Tomas is having difficulty with his quotation software.

Date	Quotation	Panel	Average	Battery	Battery rating	Battery rating	Exported	Grid	"Solar used"	Inverter	Inverter	Price	Comments
	number	rating (kW)	output (kW)	type	(kWh, gross)	(kWh, net)	(kWh)	input (kWh)			output	after rebates
8 February 2019		5.7	20.5	Tesla Powerwall 2	13.5	10.8				Fronius	5.0 kW	18,245.00	Cola Solar
24 February 2019	423	10.8	42.9	LG Chem RESU 10 (2)	19.6	17.64	8	15	89%	Fronius 8.2-1/Selectronic SPMC482-AU	8.2 kW	27,246.30	conflicting inverter specs
24 February 2019	423	10.8	42.9	BYD B-Box Pro 13.8	13.8	12.42	9	17	87%	Selectronic SPMC482-AU	8.2 kW	23,883.60	The one I chose
15 March 2019	423	10.8	42.9	LG Chem RESU 10	9.8	8.82	9	17	87%	Selectronic SPMC482-AU	8.2 kW	27,246.30	Same as first 423, but only one battery!
15 March 2019	487	10.8	42.9	BYD B-Plus L 14			8	16	87%	Selectronic SPMC482-AU	8.2 kW	28,786.30	Repeat of 423/2, $5000 more expensive; incomplete details
15 March 2019	498	10.8	42.9	BYD B-Plus H 6.4	6.4	6.4	12	22		Ingeteam SUN 1Play-6TL	6 kW	18,562.30	No "solar used"
21 March 2019	510	10.8	42.9	BYD B-Plus H 6.4 (2)	12.8	12.8	8	17	94%	Ingeteam SUN 1Play-6TL	6 kW	24,172.30
23 March 2019	498	10.8	42.9	BYD B-Plus H 6.4	6.4	6.4	12	22	91%	Ingeteam SUN 1Play-6TL	6 kW	18,562.30	Repeat of 15 March
23 March 2019	510	10.8	42.9	BYD B-Plus H 6.4 (2)	12.8	12.8	8	17	94%	Ingeteam SUN 1Play-6TL	6 kW	24,172.30	Repeat of 21 March
23 March 2019	423	10.8	42.9	BYD B-Box Pro 13.8	13.8	13.25	9	17	89%	Selectronic SPMC482-AU	8.2 kW	29,039.30	Same equipment as 24 February, $5,155/22% more expensive
23 March 2019	528	10.8	42.9	BYD B-Plus H 6.4 (3)	19.2	19.2	6	15	95%	Ingeteam SUN 1Play-6TL	6 kW	30,466.00	Missing important battery information

On the other hand, the only comparable quote that I received, from Cola Solar, was much more expensive. Compare it with quote 498 of 15 March: half the power, though nearly 70% more storage; would that ever charge up?