The Solis RHI-6K-48ES-5G is a 6kW single-phase, DC-coupled hybrid inverter from the Solis 5G energy storage range, combining solar generation, battery storage, and backup power in one unit. Unlike an AC-coupled retrofit, this inverter sits directly in the DC path between the PV array and the battery, making it suited to new-build systems or full system replacements rather than adding storage to an existing third-party PV inverter. It's compatible with both lithium-ion and lead-acid batteries across a wide 42-58V voltage range, and pairs this with an uninterrupted power supply function that switches to backup in under 20 milliseconds during a grid outage, keeping critical loads such as lighting, fridges, or WiFi running without a noticeable interruption. Six working modes, peak shaving, and a fanless natural-convection design round out a unit intended to maximise self-consumption while minimising maintenance needs.
6 kW
Rated AC Grid Output
<20 ms
Grid-to-Backup Switch Time
42-58 V
Battery Voltage Range
🔴 DNO approval note (UK): Because this inverter is capable of exporting more than 16A per phase, it falls under the G99 connection process rather than the simpler G98 route, meaning DNO acceptance is required before installation, not just notification afterwards. Installation and grid connection must be carried out and submitted by a qualified, competent installer in line with G99 and local network operator requirements.
🟡 Regional spec variation: Dimensions and weight are confirmed from the UK/EU datasheet (333 x 505 x 249mm, 17kg). Some regional datasheets for this model family (e.g. the Australian variant) list slightly different figures (340 x 510 x 250mm, 18.3kg) — the UK/EU figures above are the ones that apply to product supplied in this market.
🟡 Not the same hardware as the S5-EH1P6K-L: Some resellers and setup guides describe the RHI-6K-48ES-5G and S5-EH1P6K-L as interchangeable, since both sit in Solis' 5G-era single-phase hybrid family and share several certificates. However, the official manufacturer datasheets list different figures for the two: the S5-EH1P6K-L has a higher PV input current rating, a higher backup overload rating, and standard AFCI protection, but weighs slightly more and has a marginally lower peak efficiency than this RHI-6K-48ES-5G. Treat them as related but distinct SKUs and always confirm against the specific datasheet before quoting or specifying.
🟢 DC-coupled vs. AC-coupled: As a DC-coupled hybrid, the RHI-6K-48ES-5G connects directly to the PV strings and manages charging, discharging, and backup switching from a single unit — typically giving slightly higher round-trip efficiency than an AC-coupled retrofit, at the cost of needing to be the primary inverter for the PV array rather than an add-on to an existing one.
Sub-20ms Backup Switching
The inverter's backup circuit detects a grid loss and switches connected loads to battery power in under 20 milliseconds, fast enough that most household electronics carry on running without rebooting or losing state.
Dual Battery Chemistry Support
Compatibility with both lithium-ion and lead-acid batteries across a wide 42-58V range and up to 2000Ah capacity gives installers flexibility to size a system around budget or existing battery stock rather than being locked to one chemistry.
Dual MPPT Tracking
Two independent MPPT trackers across a 90-520V range let the array be split across roof faces or shading conditions while each string is optimised separately, improving harvest on complex roof layouts.
Fanless, Natural-Convection Cooling
A fanless design cools the unit purely by natural convection, removing a common failure and maintenance point in inverters that rely on forced-air fans, and keeping operation silent.
Remote Monitoring & Upgrades
Built-in monitoring reports real-time plant status, and firmware can be upgraded remotely, so routine maintenance and troubleshooting can often be handled without an on-site visit.
Peak Shaving & Multiple Work Modes
Multiple working modes, including peak shaving, let the battery smooth demand spikes and shift usage toward cheaper tariff periods, giving more control over how self-consumption and grid interaction are balanced.
Input DC (PV Side)
| Max. input power |
8 kW |
| Max. input voltage |
600 V |
| Rated voltage |
330 V |
| Start-up voltage |
120 V |
| MPPT voltage range |
90 - 520 V |
| Max. input current |
11 A / 11 A |
| Max. short circuit current |
17.2 A / 17.2 A |
| MPPT number / max. input strings |
2 / 2 |
Battery
| Battery type |
Li-ion / Lead-acid |
| Battery voltage range |
42 - 58 V |
| Battery capacity |
50 - 2000 Ah |
| Max. charge / discharge current |
100 A |
| Communication |
CAN / RS485 |
Output AC (Backup)
| Rated output power |
5 kW |
| Max. apparent output power |
6 kVA |
| Back-up switch time |
< 20 ms |
| Rated output voltage |
1/N/PE, 220 V / 230 V |
| Rated frequency |
50 / 60 Hz |
| Rated output current |
22 A |
| THDv (linear load) |
< 2% |
Output AC (Grid Side)
| Rated output power |
6 kW |
| Max. apparent output power |
6 kVA |
| Rated grid voltage |
1/N/PE, 220 V / 230 V |
| Rated grid frequency |
50 / 60 Hz |
| Rated grid output current |
26.1 A |
| Max. output current |
26.1 A |
| Power factor |
> 0.99 (0.8 leading - 0.8 lagging) |
| THDi |
< 2% |
Efficiency
| Max. efficiency |
> 97.5% |
| EU efficiency |
> 96.8% |
Protection
| Ground fault monitoring |
Yes |
| Integrated AFCI (DC arc-fault protection) |
Optional |
| DC reverse-polarity protection |
Yes |
| Protection class / overvoltage category |
I / II |
General Data
| Dimensions (W x H x D) |
333 x 505 x 249 mm |
| Weight |
17 kg |
| Topology |
High frequency isolation (for battery) |
| Operating ambient temperature range |
-25°C to +60°C |
| Ingress protection / pollution degree |
IP65 / PD3 |
| Cooling concept |
Natural convection |
| Max. operating altitude |
2000 m |
| Grid connection standard |
EN 50438, G98, G99, AS4777.2:2015, VDE0126-1-1, IEC 61727, VDE-AR-N 4105, CEI 0-21, CE |
| Safety / EMC standard |
IEC 62040-1, IEC 62109-1/-2, AS3100, NB/T 32004, EN 61000-6-2/-3 |
Features
| DC connection |
MC4 connector |
| AC connection |
Quick connection plug |
| Display |
7.0" LCD colour screen |
| Communication |
RS485, optional Wi-Fi / GPRS |
Is the RHI-6K-48ES-5G the same as the S5-EH1P6K-L?
No — while both are single-phase Solis hybrid inverters from the same 5G-era family and share several certificates, the official datasheets show different ratings. The S5-EH1P6K-L has a higher PV input current rating, a higher backup overload rating, and standard AFCI protection, but weighs slightly more and has a marginally lower peak efficiency than this RHI-6K-48ES-5G. Always check the SKU-specific datasheet before specifying or swapping between them.
Is this a DC-coupled or AC-coupled inverter?
It's DC-coupled: the PV strings connect directly into this inverter, which then manages solar generation, battery charging/discharging, and backup power from a single unit, rather than sitting alongside a separate existing PV inverter.
What batteries can I use with the RHI-6K-48ES-5G?
It supports both lithium-ion and lead-acid batteries across a 42-58V range, with capacities from 50-2000Ah, communicating via CAN or RS485. Always confirm a specific battery model against Solis' current compatibility list before ordering.
Does it provide backup power during a power cut?
Yes, its dedicated backup (EPS) output can supply up to 5kW to connected loads, switching from grid to battery power in under 20 milliseconds so most equipment continues running uninterrupted.
What DNO approval process applies in the UK?
As this inverter can export more than 16A, it requires G99 approval from the local Distribution Network Operator before installation, rather than the simpler G98 notify-after-install process used for smaller export-limited inverters.
Does the inverter need active cooling or regular maintenance?
No, it uses a fanless, natural-convection cooling design, which removes the fan as a maintenance and failure point. Periodically cleaning dust from the heatsink is still recommended to maintain heat dissipation.
Can the system be monitored remotely?
Yes, real-time plant status and remote firmware upgrades are supported as standard via RS485, with optional Wi-Fi or GPRS modules available for cloud-based monitoring away from site.
