EG4's 12kPV Hybrid Inverter Doubles the 6K XP's Price — Not Its Watts

Verdict $2,999.99 against $1,499.99 for the 6K XP: twice the price for 1.33 times the output, or $0.375 a watt against $0.250. The 2,000-watt step costs $0.75 a watt, three times what the whole 6K XP costs per watt.

Prices are US list prices at the time of publication. Shipping, duties and local taxes vary by country — check with the manufacturer before ordering.

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ShopSolarKits sells two EG4 all-in-one inverters out of the same catalog. The 6K XP is $1,499.99. The 12kPV is $2,999.99 — 2.00 times the price, to the cent.

Continuous output goes from 6,000 watts to 8,000. That is 1.33 times. Per watt: $0.250 on the cheap step, $0.375 on the expensive one.

The Machine

The 12kPV is a 48-volt split-phase hybrid inverter/charger: 8,000 W continuous AC, two MPPTs at 25 A each, 12,000 W of usable solar. It runs off-grid, on-grid, or sells back.

The 6K XP is the off-grid half of the same family: 6,000 W out, 8,000 W of usable solar. It is not blind to the grid — EG4 rates it for 9,000 W of AC input and a bypass — but it does not export.

Both hang on a wall and take the same 48 V bank. The 12kPV weighs 110 lb in a NEMA 4X enclosure rated to −13 °F. The 6K XP weighs 52.9 lb in an IP20 box that stops at 32 °F.

The Numbers

Per watt of solar the gap narrows: $0.1875 on the 6K XP against $0.250 on the 12kPV. Per pound it reverses. The 12kPV is $27.27 a pound against $28.36 — 3.82% cheaper by weight, and 2.08 times heavier. That is where the money went.

The cleanest number here is the one nobody advertises. Ten years of warranty on the 12kPV is $300.00 a year. Five years on the 6K XP is $300.00 a year. The two steps are priced identically against the only promise either makes.

What Breaks

The cheap step’s sales page is not the cheap step’s spec sheet, and the gap is a factor of seven. ShopSolarKits lists the 6K XP’s surge as “12,000W for ~25 seconds.” EG4’s current sheet, v1.4.4, says 12,000 W for ≈3.5 seconds — 7.14 times shorter. The same table puts the AC bypass at 60 A where the manufacturer says 50 A, and quotes a 10 ms transfer where the manufacturer says 20 ms by default and 10 ms only if selected. Surge seconds are what start a well pump.

“Twice the price” is a fact about today’s discounts, not about the product line. The seller’s own compare-at prices are $5,061.25 and $1,899.00 — a ratio of 2.67. The 12kPV is marked down 40.73%, the 6K XP 21.01%. Every ratio above moves the day either discount does.

At the top of the ladder the order reverses. EG4 parallels the 6K XP sixteen deep and the 12kPV ten. Sixteen cheap ones are 96,000 W for $23,999.84. Ten expensive ones are 80,000 W for $29,999.90 — $6,000.06 more for 16,000 W less. That is inverters only: nobody prices sixteen sets of breakers and wire against ten.

Neither one puts its nameplate on one leg. The 12kPV’s continuous line wattage is 4,000 W, exactly 50% of its rating; the 6K XP’s is 3,000 W, exactly 50% of its rating — though that one comes from the retailer’s table, which is the table this report just finished doubting.

Two costs are published for the cheap step and not for the expensive one. The 6K XP listing says “Free Shipping” and itemizes its carton down to the comm cables. The 12kPV listing does neither, on a 110-lb unit the store’s own policy routes through freight carriers. DATA NOT AVAILABLE FROM SOURCE at both. Idle, the 12kPV draws up to 55 W — 481.8 kWh a year at that ceiling, before moving a watt to a load.

The hybrid’s headline feature can cost more than the whole cheap step. EG4’s GridBOSS MID v3.1, which gives a hybrid smart load ports and whole-home transfer, is $1,799.99 on the same site, breakers extra by its own listing. Buy the 12kPV for load control and the step over the 6K XP is $3,299.99, not $1,500.00.

Who Should Buy This

The buyer who can state his own install in writing. Saturday’s splitter was for the owner who can state his auxiliary circuit in writing. Here the writing is an array size, a battery bank and a per-leg load list. Without those three the $0.375 is a price, not a decision.

The buyer who already learned that the sales page is not the spec sheet. That was Monday’s jetter, whose rental listing disclaimed its own model number. Here the retailer’s table outlived a revision and still shows 25 seconds.

Not the buyer who needs export and nothing else. If the array is under 8,000 W and the loads under 6,000, the $1,500.00 buys sell-back, five more warranty years and a weatherproof box — not watts you were going to use.

Not for anyone reading this as a cousin of the $2,999 reports. Four sit inside 10% of this price, one of them $0.99 away, and none pays back in watts: the robot mower at 12 to 31 mows, the inspection ROV at 12 dives, the portable sawmill at 5,445 board feet, the plasma table at 184 one-off parts. This one has no break-even in uses, because nothing is being replaced: one box is being swapped for a bigger box.

The power station ladder asked the same question in September, where the step cost $366.21 per kWh and every cheaper rung ended at the same box. Watts were also the unit the balcony kit was priced in, at $2.28 per watt its inverters delivered — panels included, which is why that figure and this one do not belong in one sentence except as a warning about what a “per watt” contains.

The Stack

No affiliate links in this issue. When a link earns us a commission, we always say so. Verdicts are never for sale.

An array over 8,000 W, or a utility that pays for export: the 12kPV at $2,999.99, 12,000 W of usable solar and ten years. An array under it: the 6K XP at $1,499.99, which parallels further and costs the same per warranty year.

Load shedding rather than one critical-loads panel: the GridBOSS MID v3.1 at $1,799.99, breakers extra. Before any of it, EG4 publishes both spec sheets as PDFs with version numbers on them.

Every number above came off a PDF with a version number on its cover. The page selling the cheaper machine was not off by a rounding error — it was off by a factor of seven.

Produced under the editorial standards of editor Nicolás Galindez. Spotted an error? [email protected] — the editor reads every reply.