I found some more info on the sigineer inverters, here is an email from the local dealer
Hi Brad
The HP12048D battery type selector 9 has no tesla battery algorithm,
only the HP15048D and HP18048D have that.
There is no ground to neutral connection for this inverter. The output neutral is floating by default.
Yours sincerely
Franklin Chu
Sales
Brad Ludlow
Electric Car Parts Company
Energetech Solar
7427 Main St W
Midvale, UT 84047
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Then found some links at Sigineer itself on this issue:
Split Phase Inverter Charger outputs 120/240v power supply which is split compared to 230V L N single phase system. Inverter capacity from 3000W 6000W 12KW 15,000w 18000 watts. Pure Sine Wave Output, 120 240V 110/220V 208V adjustable. Battery DC voltage from 12V 24V 48V to 96V. Models w/ builtin...
www.sigineer.com
120V / 240V Split Phase Inverter Chargers
Sigineer Power’s 120/240V Split Phase Inverter Chargers go from 3,000 watts to
15,000 watts &
18,000W with DC input of 12V, 24V, 48V &
96V.
What is a split phase inverter?
120/240 Vac split phase is a type of single-phase three-wire mid-point neutral power distribution system commonly found in America with a standard phase-neutral voltage of 120 Vac for residential and light commercial applications. The phase to phase( Live to Live) voltage is 240Vac for heavy industrial loads such as compressors, fridge, and pumps. Because of the 120-0-120 voltage configuration, it is also sometimes referred to as dual-phase, 2 phase / two-phase or even mistakenly, single-phase 220Vac.
These low-frequency split-phase inverters take 240v nominal input from shore power or generator for charging. This 240V can be from a 240V center tapped split-phase power supply of 2 hotlines or the 208V 3 phase Wye system. When the AC input is from 3 phase power system, the 3 phase neutral should NEVER be connected to our inverter.
In battery mode, these inverters produce 2 legs of 120v hotlines which can be hooked to the 220V mains power distribution panel in your home or mobile business vehicle.
There are two 120v hotlines, one neutral and one ground.
The voltage between L1 and L2 is 240 Vac, between either one hotline and the neutral is 120V. The 240V is made by the two hotlines cycling 180 degrees out of phase with each other.
This power system can drive either 120V or 240V equipments. The 120V is perfect for home and small scale commercial or mobile applications.
Our popular pure sine wave split phase inverter chargers are:
These split phase inverter models are a combination of 120 240V inverter,
smart battery charger, and
transfer switch, and can be easily integrated into your current house wiring.
With the seamless transition transfer switch, the 2 phase inverters are virtually a line interactive UPS ( Uninterruptible Power Supply ) for emergency situations and natural disasters.
In North American households, the neutral is always bonded to earth ground in the electrical panel. DON’T connect the AC input neutral to inverter ground. The AC input N is not required in the wiring. The output Neutral of the inverter is floating, it is not connected to ground in operation.
120V 240V split phase inverter AC wiring
Click to review the Sigineer Power
split phase inverter schematics in both AC mode and battery mode
Our split-phase inverters support wiring with neutral bonded with the ground or not.
NEC code requires the neutral bonded with the ground.
For other applications, neutral and ground separation preferred.
Follow this wiring instruction.
We have some customized split phase inverter charger compliant with the requirements of UL 1741 for use in stand-alone (not grid-connected) power systems, these models have the neutral grounded. They are not listed on our website publicly.
We also have some split-phase
Tesla battery inverters with voltage setting for Tesla battery modules.
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15000 Watt Inverter outputs 15KW Pure sine wave power from 48v to 120/240V 110/ 220V, 115/230V. Power inverter for home with solar system.
www.sigineer.com
order entry for 15kw
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schematic
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Important wiring instruction for split phase inverter chargers with floating neutral You may have come across the terms “floating” and “bonded” neutral. While they sound obscure to most people knowing little about electrical engineering, they are an important factor when hooking up inverter...
www.sigineer.com
Important wiring instruction for split phase inverter chargers with floating neutral
02/15/2020/
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Sigineer Power
Important wiring instruction for split phase inverter chargers with floating neutral
You may have come across the terms “floating” and “bonded” neutral. While they sound obscure to most people knowing little about electrical engineering, they are an important factor when hooking up inverter chargers.
For Sigineer Power’s split phase inverter chargers, they are NOT UL1741 listed, the output floating neutral is NOT bonded with the ground.
It MUST be separated from the earth ground. (emphasis mine)
The NEC calls this a “Floating Neutral” and “Isolated Grounds” on the Load Panels.
This is can be facilitated by removing the green bonding screw from the load panels and then Isolating all the neutrals (White Wires) to the neutral bar and then Isolating all the ground wires (Bare Copper Ground Wires) to the Isolated Ground Buss-Bar when this bonding screw is removed.
In most residential wiring systems in the USA, there is just a single service panel that acts as a combination Service Panel/Load Center.
Residential Master electricians Bond The Neutral Bar to the Case which is earth grounded with this Green Screw. This configuration works fine for a single combination Service/Load panel as the Neutral and Ground wires are treated as the same. It simplifies wire hookup with Grounds and Neutrals.
Commercial Master Electricians know how to Float the Neutrals on their Load Centers by removing these Green Bonding Ground Screws. If the proper floating neutral isn’t performed concerning Load panels this will facilitate a feedback loop to the mains service panel which will heat up the Mains In Lines Buss-Bar wasting energy and possibly resulting in a Fire.
When utilizing emergency generators this practice of Floating The Neutrals and Isolating the earth ground is very important for the same reason.
Any misjudgment can be very dangerous.
Inverter failure caused by bonded neutral with the ground void the manufacturer’s warranty.