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Off-grid solar inverters are the heart of any independent power system, converting DC battery power into usable AC electricity. When comparing models, pay attention to continuous and surge power ratings, PV input capacity, battery voltage compatibility, and the type of charge controller. Inverter types vary, but all-in-one units that combine an inverter, MPPT charge controller, and transfer switch simplify installation. For a deeper look at the lifestyle trade-offs, see our off-grid home solar guide.
The six inverters below from ECO-WORTHY and RICH SOLAR cover a range of power levels from 3,000 watts to 6,500 watts, with 48V and 24V battery options. Each includes built-in MPPT solar charging, pure sine wave output, and the ability to accept generator or utility input for backup.
Every specification on this page comes from the manufacturer’s own product page, checked on 29 October 2026. We have not used these products ourselves, so the picks are based on published specifications only.
For help sizing your system, read How to Size a Home Solar System and learn about inverter types.
How we chose these
- Continuous Output Power The inverter’s rated wattage determines what appliances you can run simultaneously.
- Surge Power Handling Look for high peak power to start motors and pumps without tripping.
- Solar Charging Capacity The maximum PV input and MPPT voltage range affect how many panels you can connect.
- Battery Voltage and Type Most off-grid inverters work with 48V battery banks, but some support 24V; check compatibility with lead-acid or lithium.
All models listed produce pure sine wave output and include built-in transfer switches for generator or utility backup.
Comparison table
| Product | Rated Power | Peak Power | Battery Voltage | Max PV Input | MPPT Voltage Range | Transfer Time |
|---|---|---|---|---|---|---|
| Liber 6kP | 6,000W | 12,000W | 48V | 9,000W | 125-425V | 10ms |
| 5000W AIO | 5,000W | 10,000W | 48V | 5,500W | 120-450V | Not stated |
| 3500W AIO | 3,500W | 6,000W | 48V | 4,400W | 60-115V | Not stated |
| NOVA 6500S | 6,500W | 13,000W | 48V | 8,000W | 90-450V | Not stated |
| NOVA 6K | 6,500W | 13,000W | 48V | 8,000W | 90-450V | Not stated |
| NOVA MAX 3K | 3,000W | 6,000W | 24V | 3,000W | 90-230V | 10ms/20ms |
All inverters produce pure sine wave output. Transfer time indicates how quickly the unit switches to battery power during an outage; ‘Not stated’ means the manufacturer did not publish this spec.
1. ECO-WORTHY Liber 6kP: for whole-home off-grid with split-phase 240V
According to ECO-WORTHY, the Liber 6kP combines an inverter, charger, and power manager in one device for off-grid homes. It delivers 120/240V split-phase output from a 48V battery bank and can start heavy motor loads. The unit accepts up to 9,000 watts of solar input and is intended for cabins, backup power, and residential off-grid use.
- Motor loading capacity: 4.8HP (ECO-WORTHY)
- Maximum hybrid charging current: 120A (ECO-WORTHY)
- Supports lithium, lead-acid, and user-defined battery types (ECO-WORTHY)
Pros: High 9,000W PV input; split-phase 120/240V output; fast 10ms transfer time; supports multiple battery types
Cons: Single MPPT route; heavy 48V battery requirement; no safety certification stated
Check the ECO-WORTHY Liber 6kP on Amazon
2. ECO-WORTHY 5000W Off-Grid AIO Inverter: for medium off-grid cabins with 120V loads
ECO-WORTHY’s 5000W inverter charger is built for off-grid split-phase setups. It provides 5,000 watts of continuous pure sine wave power at 120V from a 48V battery. The unit can charge lead-acid or lithium batteries and includes a 63A bypass breaker for generator or utility input.
- Max charge current: 60A (ECO-WORTHY)
- Power saving mode: load ≤25W (ECO-WORTHY)
- UL1741 certified (ECO-WORTHY)
Pros: UL1741 certified; high 10,000W surge; wide MPPT voltage range; power saving mode
Cons: Transfer time not stated; single 120V output only; lower PV input than 6kW model
Check the ECO-WORTHY 5000W Off-Grid AIO Inverter on Amazon
3. ECO-WORTHY 3500W Off-Grid AIO Inverter: for small off-grid cabins or backup
The ECO-WORTHY 3500W unit packs inversion, charging, and control into one device for off-grid use. It changes 48V DC battery power to 120V AC and allows remote tracking. Parallel connection is supported for later expansion. The maker suggests it for cabins, off-grid residences, and backup setups.
- Max charge current: 40A (ECO-WORTHY)
- Efficiency: 92% (ECO-WORTHY)
- Power saving mode: load ≤50W (ECO-WORTHY)
Pros: Parallel capable; remote monitoring; lower power entry point
Cons: Lower efficiency (92%); narrow MPPT voltage range (60-115V); no safety certification stated; transfer time not stated
Check the ECO-WORTHY 3500W Off-Grid AIO Inverter on Amazon
4. RICH SOLAR NOVA 6500S: for high-power off-grid with dual MPPT and 240V split-phase capable
According to RICH SOLAR, the NOVA 6500S hybrid inverter delivers 6,500 watts continuous and 13,000 watts surge. It can combine solar, battery, grid, and generator sources. Two 120-amp MPPT chargers handle up to 8,000 watts of solar. A 5-inch touchscreen and Wi-Fi monitoring are built in, and the unit is UL 1741 certified.
- Dual MPPT inputs: 18A x 2 (RICH SOLAR)
- Maximum PV open circuit voltage: 550V DC (RICH SOLAR)
- Built-in Wi-Fi monitoring (RICH SOLAR)
Pros: High 8,000W PV input; dual MPPT; UL 1741 certified; parallel up to 6 units; touchscreen
Cons: Transfer time not stated; requires 48V battery; no split-phase output mentioned (but parallel can achieve it)
Check the RICH SOLAR NOVA 6500S on Amazon
5. RICH SOLAR NOVA 6K: for high-voltage PV strings with 550V MPPT
RICH SOLAR’s NOVA 6K provides 6,500 watts of pure sine wave power and a 120-amp MPPT charger that accepts up to 550 volts of PV input. It can draw from solar, batteries, the grid, or a generator. A detachable LCD panel is used for settings, and the inverter is UL 1741 certified. Up to six units can be paralleled.
- Maximum PV open circuit voltage: 550V DC (RICH SOLAR)
- Cold start function (RICH SOLAR)
- Supports BMS communication via RS485, CAN-BUS, RS232 (RICH SOLAR)
Pros: High-voltage MPPT (550V) allows longer strings; UL 1741; parallel capable; cold start
Cons: Transfer time not stated; only one MPPT (120A) vs dual on 6500S; no touchscreen
Check the RICH SOLAR NOVA 6K on Amazon
6. RICH SOLAR NOVA MAX 3K: for smaller 24V off-grid systems
The NOVA MAX 3K from RICH SOLAR is a 3,000-watt hybrid inverter with an 80-amp MPPT charge controller built in. It can combine solar, battery, grid, and generator inputs. An LCD screen shows real-time status, and the unit works with both lead-acid and lithium batteries. It is aimed at RVs, boats, and small off-grid systems.
- Peak efficiency: 91% (RICH SOLAR)
- Maximum PV open circuit voltage: 250V DC (RICH SOLAR)
- Automatic AC recovery (RICH SOLAR)
Pros: 24V battery option; fast transfer time (10ms UPS); compact for RVs and boats; wide MPPT range
Cons: Lower power output (3,000W); smaller PV input (3,000W); no parallel capability stated; no safety certification stated
Check the RICH SOLAR NOVA MAX 3K on Amazon
Which one fits you
| Your situation | Look at | Why |
|---|---|---|
| You need 240V split-phase for well pumps or large appliances | ECO-WORTHY Liber 6kP | It outputs 120/240V and handles 4.8HP motor loads. |
| You want a UL-certified inverter with high PV input | RICH SOLAR NOVA 6500S or NOVA 6K | Both are UL 1741 certified and accept up to 8,000W of solar. |
| You have a 24V battery bank or a smaller system | RICH SOLAR NOVA MAX 3K | It works with 24V batteries and has a fast 10ms transfer time. |
| You need a cost-conscious 48V inverter for a cabin | ECO-WORTHY 3500W or 5000W | They offer 3,500W or 5,000W with MPPT charging at a lower power level. |
Practical tips
- Match the inverter’s battery voltage to your battery bank; most off-grid systems use 48V for efficiency.
- Check the MPPT voltage range to ensure it covers your solar panel string voltage, especially in cold weather when voltage rises.
- Consider surge capacity for motor-driven appliances like pumps and refrigerators; a higher peak rating prevents nuisance tripping.
- Look for UL 1741 certification if you plan to connect to a utility or generator for backup, as it ensures safety compliance.
Sources
Specifications from each manufacturer’s product page, checked 29 October 2026: ECO-WORTHY Liber 6kP, ECO-WORTHY 5000W Off-Grid AIO Inverter, ECO-WORTHY 3500W Off-Grid AIO Inverter, RICH SOLAR NOVA 6500S, RICH SOLAR NOVA 6K, RICH SOLAR NOVA MAX 3K. Makers can change specifications; check the product page before you buy.
