SolisCloud app · iOS / Android

Live view of solar generation, battery state, house consumption per phase (three-phase view shows L1/L2/L3 separately), grid import/export, SEG revenue tracking. Schedule charge windows, configure self-consumption priority, set backup reserve percentage. Web portal supports multiple inverters on one account — useful for landlords, commercial operators, or homeowners with multiple Solis-powered properties.

Octopus Agile · time-of-use arbitrage

Native Octopus Agile integration reads the half-hourly pricing API and schedules battery charge/discharge accordingly. Fills the battery during cheap or negative-priced overnight windows, discharges during expensive evening peaks. 50 A charge rate means the battery fills fast — comfortably inside the typical 2–4 hour cheap-price window without missing any opportunity.

Peak Shaving Mode (commercial)

Commercial sites on demand-charge tariffs benefit from peak shaving — programmable discharge during high-demand site periods to reduce peak kW draw. Configurable threshold (e.g. discharge any time site demand exceeds 30 kW). Substantially reduces the demand-charge component of commercial electricity bills — often the bigger commercial savings than energy arbitrage alone.

Per-MPPT monitoring

Each of the 4 MPPT trackers reports independently in the app. Critical for diagnosing under-performance on multi-aspect arrays — if the south-roof tracker is at 92% of expected but the east-roof tracker is at 65%, you know exactly which string to investigate. Faster fault diagnosis than single-MPPT inverters where all panels feed one stream.

Per-phase load monitoring

Three-phase output exposes per-phase current draw — L1 / L2 / L3 separately. Helps the installer balance loads across phases at install (don't put the heat pump and the EV charger on the same phase), and helps the homeowner spot unbalanced load conditions that could trigger DNO complaints in commercial installs. Pure single-phase systems can't see this.

Unbalanced load support

Backup port supports unbalanced three-phase loads (one phase heavily loaded, others light) and half-wave loads (older motor-driven appliances). Real-world residential loads rarely balance perfectly across three phases — the kitchen hits one phase hard, the EV charger another, the heat pump a third. Most three-phase hybrid inverters require balanced loads on backup; the S6-EH3P doesn't.

Multi-brand battery compatibility

High-voltage battery support across GivEnergy, Pylontech, BYD, Dyness, Soluna, Sungrow, Goodwe, and others — the up-to-date compatibility list is maintained at solisinverters.com. Decouples the inverter choice from the battery choice: if a customer's preferred battery brand changes between phase 1 and phase 2, the inverter doesn't need to be replaced.

Parallel multiple inverters

Multiple S6-EH3P inverters can be paralleled — up to 100 m STP CAT5 between units. Useful for commercial sites scaling beyond 10 kW (e.g. two S6-EH3P 10K inverters = 20 kW combined) without jumping to a fully commercial-class product. Configuration via the SolisCloud portal once the physical cabling is in place.

OTA firmware · improving over time

Firmware updates push over Wi-Fi, LAN, or 4G — new tariff integrations, refined battery management logic, new vehicle integrations (for solar diversion via Octa Wall etc), improved Octopus Agile decision algorithms. The unit installed today gets meaningfully better through its 10-year warranty. Solis ships major firmware releases quarterly.

1 · Solar string inputs · 4 MPPT

Four independent MPPT (Maximum Power Point Tracking) channels. Each handles one solar string, each tracks the optimal voltage/current operating point independently. Useful for multi-aspect properties: south-facing main roof on MPPT 1, east-facing morning roof on MPPT 2, west-facing afternoon roof on MPPT 3, with MPPT 4 in reserve for outbuilding panels or carport array. Total PV array up to 20 kW (16 kW usable).

2 · High-voltage battery input

DC battery connection compatible with high-voltage battery brands (GivEnergy, Pylontech, BYD, Dyness, others). The H (high-voltage) variant uses ~150–500 V DC battery bus — faster charging than the older 48 V low-voltage architecture, lower transmission losses, and the standard for premium batteries. Multi-brand compatibility means the battery choice is independent of the inverter choice.

3 · Three-phase grid tie-in

400 V three-phase grid connection — L1, L2, L3, neutral, earth. Requires three-phase supply at the property (typical for new builds and most properties with substantial electrical load). DNO G99 connection consent required for grid export. CleverBloom handles the application as part of the install scope; typical approval 4–8 weeks for residential, longer for commercial.

4 · Backup port · UPS loads

Dedicated backup output for critical loads — typically wired to a sub-circuit in the consumer unit covering fridge/freezer, broadband router, key lighting, and any medical equipment. On grid failure the inverter switches the backup port to off-grid mode within 20 ms. Backup port supports unbalanced and half-wave loads (motor-driven appliances), unusual flexibility at this price point.

5 · 3-phase smart meter · included

Three-phase smart meter ships with the inverter, fitted on the property's incoming supply tail. Reads grid import/export per phase, plus total house consumption. Feeds the inverter's load-management logic — without it the inverter operates on fixed self-consumption rules; with it, real-time arbitrage and peak shaving become possible. Pre-made meter cabling reduces install time.

6 · Communication · Wi-Fi / LAN / 4G

Wi-Fi 2.4 GHz, Ethernet RJ45, optional 4G LTE module. Connects to SolisCloud for monitoring, Octopus API for tariff arbitrage, and the homeowner's Octa Wall (where present) for solar diversion. 4G LTE recommended for properties with marginal Wi-Fi at the inverter location.

7 · Three-Phase vs Single-Phase Variant

S6-EH3P 10K (Three-Phase) — this page. £2,250 supply. Requires three-phase 400 V supply at the property. The right pick for new builds (most have three-phase as standard), larger homes with substantial electrification load (heat pump + EV + battery + solar all running), and any property where single-phase 80 A capacity is genuinely tight.

S6-EH1P 5K (Single-Phase) — see the single-phase product page. £1,400 supply. Right pick for typical UK terraced and semi-detached homes with single-phase 80–100 A supply, where the combined household load doesn't approach the main fuse rating. Same Solis engineering family, same SolisCloud platform, same warranty — just sized for single-phase supply at a much lower price.

10-year manufacturer warranty

Solis warrants the S6-EH3P 10K for 10 years from commissioning, with optional extension to 20 years available. Covers the inverter electronics, the MPPT trackers, the integrated smart meter, and the UPS switching logic. Solis is a Tier 1 inverter manufacturer with established UK distribution; spare-parts and warranty claims handled through the distributor network with typical 2-week turnaround on parts.

Solis UK distributor support

Solis has established UK distribution through Segen, Midsummer Energy, and others. Technical support via UK-based engineers, spare parts held in UK stock, warranty claim handling local rather than overseas. Lead time for replacement units typically 1–2 weeks. Critical for commercial sites where an offline inverter means a quiet PV array and lost SEG revenue.

Integrated AFCI

Integrated Arc Fault Circuit Interrupter detects and interrupts series-fault electric arcs in DC strings. Required by US code (NEC 690.11) and recommended UK practice — detects insulation degradation in DC cables before it becomes a fire risk. Particularly relevant for PV systems where DC strings run through roof voids or above living spaces. After 5 detections in 24 hours the inverter shuts down for manual reset.

Integrated DC disconnect

DC disconnect switch built into the inverter — meets safety standards without requiring an external DC isolator (though one is typically also installed at the array). Allows safe inverter servicing or removal without dismantling the solar array. Reduces installation cost and ongoing maintenance complexity.

Phase-balance vigilance

Three-phase systems can develop unbalanced loads as new appliances are added — a heat pump on L1, an EV charger on L2, kitchen circuits on L3. Over time the household phase loading drifts. CleverBloom's solar service plan includes annual phase-balance review through the SolisCloud per-phase monitoring. Catches creeping imbalance before it causes DNO compliance issues or efficiency loss.

Tariff-drift quarterly review

Octopus Agile and other dynamic tariffs change pricing curves over time — the savings model that worked in year one may not be optimal by year three. Quarterly review against the actual electricity bill (included in CleverBloom's solar service plan) catches drift. Particularly important when the inverter is paired with a battery and the household relies on time-of-use arbitrage savings.