{"product_id":"sol-s5-gc25k-dc","title":"Solis 25kW S5 3 Phase Triple MPPT - DC","description":"\u003c!-- clearray-added-v1 --\u003e\n\u003cdiv class=\"crx\"\u003e\n\n\u003cp class=\"crx-lede\"\u003eThe Solis 25kW S5 three-phase inverter, model S5-GC25K, is a transformerless grid-tie string inverter and the smallest of the S5-GC(25-40)K range. Its three MPPT trackers share six DC inputs, so one unit follows three roof pitches or three ground-mount rows, with Solis recommending up to 37.5 kW of panels behind the 25 kW nameplate.\u003c\/p\u003e\n\u003cp class=\"crx-lede\"\u003eRated output is 36.1 A a phase at 400 V, 41.8 A maximum, and Solis's grid protection table puts the 25 kW on a 50 A breaker rating where the 30 and 33 kW take 63 A and the 36 and 40 kW take 80 A. It is the only model in the range on a 50 A device, which makes it the usual first step onto three-phase commercial PV where the existing switchgear, rather than the roof, sets the limit.\u003c\/p\u003e\n\n\u003ch3 class=\"crx-h\"\u003eCommercial three-phase, at a glance\u003c\/h3\u003e\n\u003cdiv class=\"crx-facts\"\u003e\n  \u003cdiv class=\"crx-fact\"\u003e\n\u003cb\u003e25 kW\u003c\/b\u003e\u003cspan\u003eRated output\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"crx-fact\"\u003e\n\u003cb\u003e3 phase\u003c\/b\u003e\u003cspan\u003e230\/400 V supply\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"crx-fact\"\u003e\n\u003cb\u003e37.5 kW\u003c\/b\u003e\u003cspan\u003eRecommended PV\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"crx-fact\"\u003e\n\u003cb\u003e3 MPPT\u003c\/b\u003e\u003cspan\u003e6 string inputs\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"crx-fact\"\u003e\n\u003cb\u003e16 A\u003c\/b\u003e\u003cspan\u003eWorking limit per string\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"crx-fact\"\u003e\n\u003cb\u003e50 A\u003c\/b\u003e\u003cspan\u003eSolis breaker rating\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"crx-fact\"\u003e\n\u003cb\u003e27.5 kVA\u003c\/b\u003e\u003cspan\u003eMax AC output\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"crx-fact\"\u003e\n\u003cb\u003eG99\u003c\/b\u003e\u003cspan\u003eApply before install\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eThis is the 230\/400 V unit, not the S5-GC25K-LV, the AU version or the S6. Conversion peaks at 98.5%, 98.1% by the EU measure: the 25 and 30 kW share the lowest pair of figures in the range, and the 36 and 40 kW reach 98.7%.\u003c\/p\u003e\n\n\u003ch3 class=\"crx-h\"\u003eIs 25 kW the right size?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cb\u003eA good fit:\u003c\/b\u003e a supply that can take 36.1 A a phase, and Solis's recommended 37.5 kW of panels across no more than three orientations — which also keeps a single-inverter system inside the 50 kWp scope of MCS MIS 3002.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003ePast 37.5 kW:\u003c\/b\u003e the \u003ca href=\"\/products\/sol-s5-gc30k-dc\"\u003e30 kW S5-GC30K\u003c\/a\u003e, same three trackers, 45 kW of panels recommended, but a 63 A breaker and the cable to match.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eFour orientations:\u003c\/b\u003e the \u003ca href=\"\/products\/sol-s5-gc36k-dc\"\u003e36\u003c\/a\u003e and \u003ca href=\"\/products\/sol-s5-gc40k-dc\"\u003e40 kW\u003c\/a\u003e add a fourth tracker and eight inputs, on 80 A.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eSmaller:\u003c\/b\u003e the \u003ca href=\"\/products\/sol-s5-gr3p-20k-dc\"\u003e20 kW S5-GR3P20K\u003c\/a\u003e, 30 kW of panels on two trackers, and 20 kg to lift instead of 38.2 kg.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eModules over 16 A:\u003c\/b\u003e string current is the ceiling here, not power. Solis's own answer is the S6-GC3P25K03-NV-ND, listed at 20 A a string across 42 A trackers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 class=\"crx-h\"\u003eLaying out the strings\u003c\/h3\u003e\n\u003cp\u003eTwo strings land on each tracker. Hold any single string at or under 16 A working current, and the pair on one tracker at or under 32 A working and 40 A short-circuit — roughly 20 A of Isc each once a bifacial module's rear-side gain is counted. On high-current modules that 16 A string limit is reached well before the 25 kW is full, and that, rather than any shortage of power, is the usual reason to step up.\u003c\/p\u003e\n\u003cp\u003eSize each string to sit near the 600 V rated DC voltage and to stay under 1,100 V open-circuit on the coldest morning of the year; the trackers hold from 200 V to 1,000 V, and the unit initialises at 180 V. Spread evenly, Solis's recommended 37.5 kW works out at about 6.25 kW a string across the six inputs. Being transformerless, neither PV pole may be earthed.\u003c\/p\u003e\n\n\u003ch3 class=\"crx-h\"\u003eThis one needs a G99 application\u003c\/h3\u003e\n\u003cdiv class=\"crx-note\"\u003e\n  \u003cdiv\u003e\n    \u003cb\u003eThe DNO answers first\u003c\/b\u003e\n    \u003cp\u003eAt 36.1 A a phase this one is over the 32 A ceiling that G99's fast-track small-generation routes work to, so it takes the standard Type A route, applied for before the install. It is Fully Type Tested, so the installer quotes ENA references rather than submitting a compliance report: SOLIS\/04225\/V1\/A3 for G99, SOLIS\/04076\/V1\/A1 in Northern Ireland and SOLIS\/13231\/V1 for G100. The certificates those references point to, with the datasheet and the installation manual, download from the Documents tab on this page.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch3 class=\"crx-h\"\u003eFitted and supplied\u003c\/h3\u003e\n\u003cul class=\"crx-inc\"\u003e\n  \u003cli\u003eIntegrated DC switch, the -DC in the part number, with Type II surge arresters on both the DC and the AC terminals\u003c\/li\u003e\n  \u003cli\u003eSix MC4 connectors, the back plate and its screws, the AC terminal cover, an RJ45 plug for the DRM port and the pluggable RS485 terminals\u003c\/li\u003e\n  \u003cli\u003eArc-fault detection, fitted but inactive until it is switched on under Special Settings — which MCS MIS 3002 requires on any inverter that has it\u003c\/li\u003e\n  \u003cli class=\"crx-no\"\u003eWall fixings: the M10×70 expansion bolts are the installer's\u003c\/li\u003e\n  \u003cli class=\"crx-no\"\u003eA three-phase meter, if the DNO caps export\u003c\/li\u003e\n  \u003cli class=\"crx-no\"\u003eA data logger, and a 4-pin one: the USB sticks the S6 range uses do not fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"crx-warn\"\u003e\n\u003cp\u003e\u003cb\u003ePlease note that this inverter does not include a data logger, CT, meter or export power manager.\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe meter \"SOL-METER-3PH-CT3\" is needed for export power control of one inverter, for more than one inverter use the EPM3-5G-PLUS.\u003c\/li\u003e\n\u003cli\u003eThe meter requires a data logging stick but EPM3-5G-PLUS has a built in data logger.\u003c\/li\u003e\n\u003cli\u003eThese items are sold separately.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch3 class=\"crx-h\"\u003eOn the wall\u003c\/h3\u003e\n\u003cp\u003eSolis's 2024 manual and its December 2025 UK flyer both give 38.2 kg; the older datasheet in the Documents tab says 37 kg. Either way it is a two-person lift onto the back plate, which goes up on M10×70 expansion bolts in 10 mm holes drilled 60 mm deep. Mount it vertical, or tilted back by no more than 15 degrees, never forward and never flat, and leave 500 mm above, below and to each side, 1,000 mm in front, and 500 mm between the bottom of the case and the floor.\u003c\/p\u003e\n\u003cp\u003eThe AC gland closes on a 22 to 32 mm outer diameter, 27 mm being Solis's recommendation, so check a planned SWA against that before ordering it. Cores are copper, 10 to 35 mm² with 25 mm² recommended, landing on crimped ring terminals with the terminal-block screws taken to 3 to 4 Nm. Besides the PE core, the manual wants a second earth of at least 16 mm² outdoor copper on the heat-sink stud. For residual current, Solis recommends an external Type A device at 300 mA for this model — the same figure as its maximum continuous residual current under IEC 62109, where the 30 kW's is 330 mA — on top of the monitoring already inside the unit, and its note says stricter local rules take precedence, so BS 7671 has the last word.\u003c\/p\u003e\n\n\u003ch3 class=\"crx-h\"\u003eOrder alongside\u003c\/h3\u003e\n\u003cul class=\"crx-need\"\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/sol-meter-3ph-ct3\"\u003eExport meter, DTSD1352 with three CTs\u003c\/a\u003e\n    \u003cp\u003eThe meter type named in the installation manual and on this inverter's G100 registration, supplied with 150 A:5 A CTs. It drives one inverter, not a row of them. Put it on the grid side and, once a logger is in the COM port, SolisCloud shows site consumption against generation as well as holding the export cap.\u003c\/p\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/sol-s1-w4g-st-s5-4p\"\u003eWi-Fi and 4G data logging stick, 4-pin\u003c\/a\u003e\n    \u003cp\u003eSolis files the S5-GC(25-40)K under 4-pin loggers, never the USB type. This one covers all S5 inverters and carries 4G behind the Wi-Fi, but it ships without a SIM, so a yard with no router needs a data SIM putting into it.\u003c\/p\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/sol-s2-wl-st\"\u003eWi-Fi and wired LAN stick, 4-pin\u003c\/a\u003e\n    \u003cp\u003eThe same 4-pin COM port, for a plant room with a network cable already run to it. The meter's own listing names this stick as one of the two loggers to pair with it.\u003c\/p\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/sol-war-10y-25-40k-s5\"\u003eCover to 10 years, claimed in year one\u003c\/a\u003e\n    \u003cp\u003eThe standard warranty runs 5 years from commissioning, or from 6 months after the unit leaves the factory if that comes first, which is worth knowing when a pack is held between jobs. The extension has to be claimed within 12 months of installation against the serial number, and a 20-year version of the same certificate is written for the 25 to 40 kW S5 GC.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 class=\"crx-h\"\u003eInstaller questions\u003c\/h3\u003e\n\u003cdiv class=\"crx-qa\"\u003e\n  \u003cdiv\u003e\n\u003cb\u003eHow is the export limit set?\u003c\/b\u003e\n    \u003cp\u003eOne inverter, one meter on RS485, grid side or load side, with the export limit set on the inverter anywhere from 0 to 29,900 W — on this unit, anything from zero export up to its full output. In the UK the fail-safe has to be on under G100, so generation stops if the meter or a CT drops off. Backflow mode 01 works on the three-phase average; mode 02 holds every phase down, which is the one for unbalanced single-phase loads.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv\u003e\n\u003cb\u003eWhat can I see without a data logger?\u003c\/b\u003e\n    \u003cp\u003eThe two-line screen steps through the current on each of the six inputs, I_PV01 upwards, grid voltage and current per phase, the energy history and the 100 latest alarms. The built-in I-V scan runs a 60-point sweep and shows the curve string by string. SolisCloud is the part that needs the stick.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv\u003e\n\u003cb\u003eWhy would it power up and generate nothing?\u003c\/b\u003e\n    \u003cp\u003eDRM switched on with nothing wired to pins 5 and 6 of the RJ45 plug that came in the box holds output at zero and reads \"Limit by DRM\"; with G99 selected it is off by default. Otherwise check for more than 350 V on the DC side, and expect 30 to 300 seconds of grid checking from switch-on.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv\u003e\n\u003cb\u003eCan it live on an outside wall?\u003c\/b\u003e\n    \u003cp\u003eIP66 and −25 °C to +60 °C, but Solis asks for it out of direct sun and rain, and shaded above 40 °C ambient, because sun on the case can bring on output power limiting — at 25 kW, on the afternoons the array is producing most. Solis's current datasheet puts typical noise at 60 dB(A) or less from the intelligent fan cooling, and the case surface can exceed 75 °C, so the manual asks for it to be installed out of reach of children.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv\u003e\n\u003cb\u003eBuying a pack of three or six?\u003c\/b\u003e\n    \u003cp\u003eA pack is three or six of the same S5-GC25K-DC. One meter drives one inverter, so several units want the external EPM on the RS485 bus, and two of them put a site at 50 kW, past the short G99 Form A1-1. If they go into a store first, keep them boxed with the desiccant and stacked no more than three high.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"crx-warn\"\u003e\u003cp\u003eThis product must be installed by a qualified electrician\/technician. All installations must adhere to local wiring regulations and standards. ClearRay Solar will not be held liable for any product malfunctions as a result of incorrectly installed systems.\u003c\/p\u003e\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Solis","offers":[{"title":"Single","offer_id":57440940228940,"sku":"SOL-S5-GC25K-DC","price":888.93,"currency_code":"GBP","in_stock":false},{"title":"Pack of 3","offer_id":58862264058188,"sku":"SOL-S5-GC25K-DC-3","price":2559.26,"currency_code":"GBP","in_stock":false},{"title":"Pack of 6","offer_id":58862264090956,"sku":"SOL-S5-GC25K-DC-6","price":5064.76,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1048\/7742\/4972\/files\/SOL-S5-GC25K-DC.jpg?v=1778196356","url":"https:\/\/clearraysolar.co.uk\/products\/sol-s5-gc25k-dc","provider":"ClearRay Solar","version":"1.0","type":"link"}