Description
Some Buildings Will Never Wait for the Grid. A workshop, a container office, a cabin on a site where the utility connection is months away, a boat, a rural property that loses power every storm season. What those places need is not simply a larger battery but an inverter that can accept energy from wherever it happens to exist and hand it back in the shape the equipment expects.
Three sources, one enclosure. The NM-ECO combines inverter, solar charger and battery charger in a single unit. It takes 24V DC from a battery bank, 110V or 120V from the grid or a generator, and DC from an array through a built-in 120A MPPT charge controller with a maximum photovoltaic voltage of 500V. It will also run without a battery at all, which matters when the panels are installed before the bank is funded.
Pure sine wave rather than an approximation of one. Output is a true sine wave at 50 or 60Hz, which is what motor loads, pumps, compressors and anything with a switching supply should be given. A 6.25-inch LCD with front-panel buttons sets charging current, AC or solar priority, and acceptable input voltage without a laptop on the site.
Built to be maintained rather than replaced. Four dissipation surfaces manage heat, and over-load, over-temperature and output short-circuit protection are all present alongside a cold-restart function and automatic lithium battery activation. Communication runs over RS232 or RS485 with optional Wi-Fi monitoring, and one button returns the unit to factory settings when a setting has been chased too far.
The grid is a convenience. This is the assumption that the lights stay on without it.
What the Island Current Carries
- ✦ Hybrid inverter, solar charger and battery charger in one enclosure
- ✦ 3.6KW rated output running from a 24V DC battery bank
- ✦ 110V and 120V AC dual output in a true pure sine wave
- ✦ Built-in 120A MPPT solar charge controller with 500V maximum PV voltage
- ✦ Runs without a battery for daytime photovoltaic-only operation
- ✦ 6.25-inch LCD with front-panel button configuration
- ✦ Configurable AC or battery input priority
- ✦ RS232 and RS485 communication with optional Wi-Fi monitoring
- ✦ Over-load, over-temperature and output short-circuit protection
System Record
- Model number: NM-ECO
- Rated output power: 3.6KW
- Battery voltage: 24V DC
- AC output voltage: 110V / 120V, dual output
- Output waveform: Pure sine wave
- Output frequency: 50Hz / 60Hz
- Solar charge controller: Built-in MPPT, 120A
- Maximum PV voltage: 500V
- Maximum charging current, AC and solar combined: 120A
- Battery-free operation: Supported
- Monitoring: RS232 / RS485, optional Wi-Fi
- Protection: Over-load, over-temperature, output short-circuit
- Dimensions: 50.5 x 42.5 x 8.5cm
- Weight: 9.7kg
- Certification: CE
- Origin: Mainland China
Where the Island Current Is Installed
The installer who specifies this unit is usually solving one of five problems. An off-grid cabin or container office that needs 110V or 120V from a 24V bank and a modest array. A grid-tied property in a storm region that wants a battery-backed circuit for pumps, freezers and lights when the utility drops. A construction or agricultural site where the mains connection is delayed and the site still has to run. A marine or vehicle installation with a 24V house bank where a pure sine wave matters for electronics and motor loads. And increasingly, a resilience retrofit where the owner has decided that a single 3.6KW circuit is enough and does not want to rebuild the whole electrical panel. In all five cases the decisive specification is the same: a 120A MPPT controller that harvests what the array produces, and the ability to keep running from PV alone when the battery bank is not yet installed. The manufacturer's own sequence is worth following on commissioning, which is battery first, then AC or PV input, then the load, and the reverse when shutting the system down.
Installer Questions
Q: Does this inverter really work without a battery?
A: Yes. Battery-free operation is a listed feature, which allows the unit to run from photovoltaic input during daylight hours. Be aware that without a battery the system cannot ride through a passing cloud, so treat battery-free operation as a daytime mode rather than a full off-grid design.
Q: What size array can the MPPT controller take?
A: The built-in controller is rated 120A with a maximum photovoltaic voltage of 500V. Size the array to the controller's capacity rather than the panel count, and check the open-circuit voltage of your string at the coldest expected temperature before you wire it, because cold cells raise voltage.
Q: Can it charge the battery from both the mains and the array at once?
A: The combined maximum charging current for AC and solar is 120A. The unit manages charge priority itself, and you can configure AC or battery input priority on the front panel depending on whether you are protecting a fuel bill or a cycle life.
Q: What does the unit need in terms of commissioning order?
A: The manufacturer specifies battery first, then AC input or PV input, then the load. Shut down in the reverse order, load off first, then AC or PV, then the inverter, then the battery. Following that sequence avoids the inrush conditions that cause avoidable faults.
Q: Will it run a well pump or an air compressor?
A: The output is a pure sine wave, which is what motor and compressor loads should be given. The limiting factor is the starting surge rather than the running load, so give us the motor's rated and starting current and we will tell you whether a 3.6KW unit is the right size or whether you need to step up.
Q: Is remote monitoring possible?
A: RS232 and RS485 are built in and Wi-Fi monitoring is available as an option. The Wi-Fi variant is a distinct configuration in this listing, so select it explicitly if you intend to monitor the system remotely rather than assuming it is included.
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