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Solis S5-EH1P6K-L 6kW Single Phase Hybrid 5G Inverter with DC Switch (for LV Batteries)

The Solis S5-EH1P6K-L is a 6kW single-phase, DC-coupled hybrid inverter from the current-production S5-EH1P(3-6)K-L residential energy storage range, built with an integrated DC isolator switch and designed for new PV installations that need solar generation, battery storage, and backup power handled by one unit. It's compatible with both lithium-ion and lead-acid batteries across a 42-58V range, offers a 5kW backup (EPS) output that switches from grid to battery power in under 20 milliseconds during an outage, and adds AFCI (arc-fault circuit interrupter) protection as standard to proactively reduce DC-side fire risk. Two independent MPPT trackers, a fanless natural-convection design, and remote SolisCloud monitoring make it a straightforward, low-maintenance core for a residential storage system.

6 kW

Rated AC Grid Output

5 kW

Backup (EPS) Output

<20 ms

Grid-to-Backup Switch Time

42-58 V

Battery Voltage Range

>97.1%

Max. Efficiency

IP65

Ingress Protection

🔴 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.

🟡 Not the same hardware as the RHI-6K-48ES-5G: The S5-EH1P6K-L has higher-rated PV input current (2 x 15A vs 2 x 11A), a higher backup overload rating (7kVA vs 6kVA), standard AFCI protection (vs optional on the RHI), and a higher operating altitude rating (3000m vs 2000m), but a marginally lower peak efficiency (>97.1% vs >97.5%) and greater weight (18.3kg vs 17kg).

🟢 Integrated DC switch: The S5-EH1P6K-L includes a built-in DC isolator switch, letting the PV strings be safely disconnected at the inverter itself without needing a separate external DC isolator between the array and the unit.

Standard AFCI Fire Protection

Arc-fault circuit interrupter protection is built in as standard (activation required at commissioning), continuously monitoring the DC circuit for arcing faults and proactively reducing fire risk from damaged or degraded PV cabling.

Sub-20ms Backup Switching

On grid loss, the inverter switches connected loads to battery power in under 20 milliseconds, fast enough that most household electronics keep running without rebooting or losing state.

Higher-Rated Backup Overload

The backup port can handle up to 7kVA for 10 seconds, giving extra headroom to ride through the inrush current of motor-driven appliances like fridges or pumps when running on battery power.

Dual Battery Chemistry Support

Compatibility with both lithium-ion and lead-acid batteries across a 42-58V range and up to 2000Ah capacity gives installers flexibility to size a system around budget or existing battery stock.

Dual MPPT Tracking

Two independent MPPT trackers rated to 15A each 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.

Input DC (PV Side)

Recommended max. PV 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	15 A / 15 A
Max. short circuit current	22.5 A / 22.5 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 power	5 kW
Max. charge / discharge current	100 A
Communication	CAN

Output AC (Backup)

Rated output power	5 kW
Max. apparent output power	7 kVA (10 sec)
Back-up switch time	< 20 ms
Rated output voltage	1/N/PE, 220 V / 230 V
Rated frequency	50 Hz / 60 Hz
Rated output current	23 A / 22 A
THDv (linear load)	< 2%

Input AC (Grid Side)

Input voltage range	187 - 265 V
Max. input current	34.5 A / 33 A
Frequency range	45 - 55 Hz / 55 - 65 Hz

Output AC (Grid Side)

Rated output power	6 kW
Max. apparent output power	6.6 kVA
Operation phase	1/N/PE
Rated grid voltage	220 V / 230 V
Rated grid frequency	50 Hz / 60 Hz
Rated grid output current	27.3 A / 26.1 A
Max. output current	30 A
Power factor	> 0.99 (0.8 leading - 0.8 lagging)
THDi	< 2%

Efficiency

Max. efficiency	> 97.1%
EU efficiency	> 96.5%

Protection

DC reverse-polarity protection	Yes
Short circuit protection	Yes
Output over current protection	Yes
Surge protection	DC Type II / AC Type II
Ground fault monitoring	Yes
Integrated AFCI (DC arc-fault protection)	Yes (activation required)
Protection class / overvoltage category	I / II

General Data

Dimensions (W x H x D)	333 x 505 x 249 mm
Weight	18.3 kg
Topology	High frequency isolation (for battery)
Operating ambient temperature range	-25°C to +60°C
Ingress protection	IP65
Cooling concept	Natural convection
Max. operating altitude	3000 m
Grid connection standard	G98 or G99, VDE-AR-N 4105 / VDE V 0124, EN 50549-1, VDE 0126 / UTE C 15 / VFR:2019, RD 1699 / RD 244 / UNE 206006 / UNE 206007-1, CEI 0-21, C10/11, NRS 097-2-1, EIFS 2018.2, IEC 62116, IEC 61727, IEC 60068, IEC 61683, EN 50530
Safety / EMC standard	IEC/EN 62109-1/-2, EN 61000-6-2/-3

Features

DC connection	MC4 connector, integrated DC switch
AC connection	Quick connection plug
Display	7.0" LCD colour screen
Communication	RS485, optional Wi-Fi / GPRS

Is the S5-EH1P6K-L the same as the RHI-6K-48ES-5G?

No — while both are single-phase Solis hybrid inverters from the same 5G-era family and share several certificates, 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 the RHI-6K-48ES-5G.

What does the integrated DC switch do?

It's a built-in isolator that lets the PV array be safely disconnected from the inverter at the unit itself, without requiring a separate external DC isolator switch to be fitted between the panels and the inverter.

What batteries can I use with this inverter?

It supports both lithium-ion and lead-acid batteries across a 42-58V range, with capacities from 50-2000Ah, communicating via CAN. 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, with a short-term overload capability of up to 7kVA for 10 seconds to handle appliance start-up surges.

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.

What does the AFCI protection do?

The integrated arc-fault circuit interrupter continuously monitors the DC wiring between the panels and the inverter for signs of arcing, a common cause of PV fires, and can shut the string down automatically if a fault is detected. It requires activation during commissioning.

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