Abasebenzisi bokufaka iibhotile eStellenbosch banokuba ne-kW eseleyo kwi-PCS display kodwa kancinci amandla ombane asele kwi-L1. Iilebhile, iikhodi kunye neesekethe zeofisi zinokwabelana ngelo phase kunye neemfuno zokuzalisa nokumpompa. Ii-converter zeMegSolid PMA ziyakwazi ukumelana nalo mthwalo ongalinganiyo we-phase kwiimodeli ze-80, 105 ne-125 kW, kuxhomekeke kwimida yomsinga we-phase yemodeli nganye.
Ngethuba lokunqamka kombane, i-converter ithutha ezo ndawo zokuhambisa umbane kwibhodi ekhuselweyo. Yilinganise ngokomthwalo kwifase nganye kunye nesixa-mpendwa se-kW.
MegSolid PMA080, PMA0105 kunye ne-PMA0125 Yabelana ngendawo yokudibanisa i-AC eyi-400 V kunye nesakhono esipapashiweyo se-100% sokumelana nomthwalo ongabalansiwanga we-single-phase. Thelekisa amanqanaba azo e-AC apha ngezantsi:
| Imodeli iMegSolid | Amandla ombane we-AC amiselweyo | Umbane oqhubekayo oqikelelweyo | Umlinganiselo ophezulu wamandla ombane otyhutyhayo |
|---|---|---|---|
| PMA080 | Amashumi asibhozo kwii-kilowatt | I-115 A | 138 A |
| PMA0105 | 105 kW | Ikhulu namashumi amahlanu A | 180 A |
| PMA0125 | 125 kW | 180 A | 216 A |
Umphakamo wamanje unokunciphisa ibhodi enee-kW eziseleyo.
Utshintsho olulandelelanayo kumgca wokubotila lunokushiya ibhodi yendlu yokwenza iwayini namasebe anesigaba esinye asasazwe ngokungalinganiyo. Umbane olinganisa umgca osebenzayo usenokufumana i-L1 ingenayo, i-L2 ikufutshane no-ziro kunye ne-L3 ikufutshane nokuphuma. Amandla apheleleyo asenokuba sekwinqanaba elilindelekileyo.
Ubuchule obupapashiweyo “be-100% single-phase unbalanced load” buvumela i-PMA ukuba isebenze kunye nesidingo se-phase esingalinganiyo ngaphakathi kwemida yayo yombane. Ayibeki wonke ama-80, 105 okanye 125 kW kwi-phase enye. Ukwabiwa komthwalo okucetywayo kufuneka kuhlale kungaphakathi kwesona sixa sipheleleyo esivumelekileyo kunye nomsinga we-phase ovumelekileyo, kunye nobuchule obufanelekileyo bekhebula, umthamo we-neutral kunye nezicwangciso zokhuseleko.
Rekhoda umbane wangoku wesigaba phambi kokuba uchaze i-converter enkulu. I- Ukulinganiselwa kobungakanani be-BESS esuka kwisigaba esinye ukuya kwizigaba ezithathu Indlela iquka uphononongo lwokwabiwa kwamagatsha.
Umlinganiselo we-PCC kunye nomthetho wokuthunyelwa kweempahla kweli ziko
Lungiselela imida yokuthunyelwa kwe-EMS ngokweemfuno zomenzi-nxibelelanisi wombane wesiza.
ISixeko saseCape Town siwahlula phakathi kwe-SSEG edityaniswe nogridi enokuthumela umbane ngaphandle kunye naleyo ingathumeli mbaso ngaphandle. Ukuthumela umbane ngaphandle kufuna imitha ye-AMI yesixeko ejikelezayo macala omabini; ufakelo olungathumeli mbaso ngaphandle lufuna ukuvalwa kwamandla abuyayo. Ii-inverters ezidityaniswe kuthungelwano lweSixeko kufuneka zivele kuluhlu lwaso oluvunyiweyo lwe-NRS 097-2-1, kwaye uqhagamshelo lwezixhobo lulandela i-SANS 10142-1.
I-Drakenstein, i-Stellenbosch, i-George, i-Saldanha Bay kunye nezinye iingqawu zaseNtshona Cape ziqhuba iinkqubo zazo ze-SSEG ngalo mthombo mnye we-NRS 097-2. Izikhululo ze-Eskom-direct zisebenzisa indlela ye-Eskom yokuvelisa umbane ngaphakathi, hayi ifomu yeSixeko.
Ukuqaliswa komsebenzi kufuneka kuqinisekise ukuba i-EMS ilawula amandla adityanisiweyo e-three-phase okanye amandla abuyayo kwi-phase nganye. Indawo ye-CT kufuneka ingqamane naloo mmida. Xa i-CT ikufeder engeyiyo, umsebenzisi usenokufunda gwenxa ukuhamba kwe-L3 ngelixa umgca wokuphawula uqhubeka nokungenisa kumandla kwi-L1.
Iisetingi zolawulo ezingachanekanga zinokuchaza ukuhamba okubonwayo naxa amandla e-PCS anele. Lungiselela Ulawulo lokungathunyelwa kwamanye amazwe kwi-PCC Ngokufakwa kwe-CT, umda wokulinganisa kunye nesilayidi se-EMS zihambelana nentambo evunyiweyo.
Ireyithi yokufaka i-SSEG yaseKapa isekelwe kwishedyuli yamatarifa kaMasipala yangoku kwaye iyatshintsha kunyaka wohlahlo-lwabiwo-mali. Sebenzisa loo shedyuli ukuba ingeniso yokuthumela iimpahla kumazwe angaphandle iyinxalenye yale modeli. Thelekisa ingeniso yokuthumela iimpahla kumazwe angaphandle nokuthengwa kombane okuphetshisiweyo kunye neendleko zomsebenzi wokubotila ophazamisekileyo, usebenzisa ibhili kunye neerekhodi zokuvelisa zale ndawo.
Ibhodi ekhuselweyo kufuneka isebenze ngaphandle kwenkxaso yegridi.
Ukucima kombane kuye kwehla ngo-2025 nango-2026, kodwa ukuphazamiseka kombane kwasekhaya kusenokumisa umgca wokufaka iibhotile kwaye kulibazise iitanki neelori ezicwangcisiweyo ngexesha lokuvuna. Ukusebenza kunxibelelene negridi kunokufihla ukunqongophala kwe-phase kuba umbonelelo-gezi unika imfuno engaphaya kwemveliso ye-PCS. Xa isiza siqhawula unxibelelwano negridi, i-converter kufuneka ithwale imithwalo ekhuselweyo ngaphakathi kwemida yayo ye-phase.
IMegSolid ipapasha ezi nkcukacha ze-PMA:
- 100% umthwalo ongalinganiyo we-single-phase
- 230/400 V yomphumo ongaxhunyaniswanga kwinethiwekhi
- Amandla e-AC alinganisiweyo angama-80 / 105 / 125 kW
- Ukutshintshela phakathi kwe-on-grid ne-off-grid ngaphantsi kwe-20 ms
- I-THD yevoltheji ye-3% kunye nomthwalo olulandelelanayo
Izibane neesekethe zegumbi lokulawula ezikwi-L1 zibalwa kumda wangoku we-phase ngexesha lokusebenza ngombane wesipele. Zibandakanye kunye nenyathelo lokuqala lomthwalo emva kotshintshelo kuvavanyo lomthwalo okhuselweyo. Thelekisa i-kW iyonke kunye nemfuno yokuqalisa nombane ophumayo we-converter okhoyo kwqondo lobushushu lokusebenza.
Inani likaMegSolid elingaphantsi kwe-20 ms libandakanya utshintsho lwe-PCS. Injineli yesiza kufuneka ibandakanye ixesha lokufumanisa nokutshintshela, ukusebenza kwebrake, kunye nokunyamezela komthwalo xa udlula xa iyila i Indlela yokuxhasa enxulumene nogridi njengenkqubo epheleleyo. Ukuvavanya ukudluliselwa xa imithwalo ekhuselweyo idityisiwe kuqinisekisa ukuba izilawuli zefiller kunye neziqalisi zepompo zihlala zisebenza.
Umthamo wokuqalisa ngoku ufuna irekhodi elahlukileyo kunomthwalo oqhubekayo wokufaka iibhotile. Sebenzisa i Ukulungiswa kobungakanani be-PCS ekuqaliseni i-motor Indlela yokuhlola umthamo wokungenisa phambi kokunyusa isilinganiselo sekonverters.
Ukukhethwa kwe-PMA ngenxa yemfuno yokuqhuba nokuqalisa
PMA080
Vavanya i-PMA080 kumsebenzi we-70–80 kW. Inomveliso we-AC we-80 kW, umsinga we-AC oqikelelwe kwi-115 A kunye nomlinganiselo ophezulu we-138 A. Amandla aphezulu e-DC angama-96 kW. Imfuno yokuqalisa okanye ukuncitshiswa komlinganiselo ngenxa yobushushu kunokufuna imodeli enkulu nangona ikulo mlinganiselo wemithwalo. Jonga ifeyizi nganye ngokomda wayo wongu-current ovunyiweyo; zonke iimodeli ezintathu zibonelela ngomsebenzi ofanayo wemthwalo ongalinganiyo.
PMA0105
Iindawo ezinomthwalo olinganisiweyo ongange-100 kW zingavavanya amanqanaba e-PMA0105 angama-105 kW kunye ne-150 A AC. Owona msinga mkhulu we-AC yi-180 A; owona mandla aphezulu e-DC yi-126 kW. Oku I-inverter yokugcina amandla e-105 kW Inika amandla apheleleyo angaphezulu kunalawo e-PMA080. Jonga ifeyizi exakwe kakhulu phambi kokuba wamkele la mandla ongezelelweyo njengoneleyo kwisiza.
PMA0125
Umthwalo oqhubekayo okanye imfuno yokutshintshela isenokufuna i-125 kW PMA0125. Ummandla wayo oqhelekileyo wokuqhuba u-AC yi-180 A, owona mmandla mkhulu wokuqhuba u-AC yi-216 A, kwaye owona mandla mkhulu e-DC yi-150 kW. Sebenzisa ukuncitshiswa komandla ngenxa yobushushu xa ujonga umphumo okhoyo kwindawo yofakelo.
Ibhodi ye-400 V kufuneka ithwale umbane we-AC okhethiweyo.
Ukuphucula ukusuka kwi-80 okanye i-105 kW ukuya kwi-125 kW kunyusa umbane i-board eyi-400 V ekufuneka iwamkele. Hlola iisekethe zemigca yokuphawula kunye namasebe okhuseleko acetywayo malunga nombane we-phase, umthamo we-neutral kunye nomthamo we-switchboard. Lungisa ii-CTs ezibekwe gwenxa phambi kokuba usebenzise imilinganiselo ukuthethelela utshintsho lwemodeli.
Sebenzisa i Uqhagamshelo lwe-BESS lwe-400 V kwaye interconnection readiness checks against the selected PMA current class.
PCS ratings under installed operating conditions
MegSolid specifies grid-current THD below 2% on-grid and 98.7% maximum PCS efficiency. Site power-quality measurements must account for VFDs and transformer behaviour at the agreed acceptance boundary. System efficiency also includes battery, cable and auxiliary losses. The test method is covered in the BESS power-quality acceptance test.
MegSolid lists the following overload capability:
- ≤110% continuous
- ≤120% for 2 minutes
- >120% for 200 ms
Confirm the applicable operating limits before using the ≤110% continuous allowance for sustained duty above rated power. Higher overload levels are limited to the published durations and approved conditions.
Integrators can connect the PCS to the BMS and EMS through RS485, CAN and Ethernet. Set EMS priority logic to allocate power and energy between phase demand, backup reserve and zero-export control.
MegSolid specifies an operating range of −30 to +60 °C, with derating above 45 °C, and installation up to 5,000 m, with derating above 3,000 m. The power compartment has an IP20 rating and the control compartment IP6X. Provide a suitable system enclosure for outdoor installation.
Closed containers around Worcester or Robertson can have different heat exposure from plant rooms in coastal Cape Town. Use the intake temperature during the required duty to select output, based on measurements or the site’s design conditions.
Choosing the model from the recorded load
Compare phase records from normal operation and backup against the aggregate or per-phase export target. Those records help distinguish insufficient converter power from uneven load distribution. Keep pump-start demand separate from sustained load, and reserve enough battery energy for backup when the system also shifts solar energy.
| Imeko yendawo | Imveliso kaMegSolid | Why |
|---|---|---|
| Uneven phases, total duty near 80 kW | PMA080 | Lower power class, unbalanced-load support retained |
| Duty around the 100 kW class | PMA0105 | 105 kW rating, same phase capability |
| Total PCS duty needs the higher class | PMA0125 | Rated power rises to 125 kW |
| One phase restrictive, total kW adequate | Keep PCS size under review | Correct distribution first |
| Imbalance only appears after islanding | Review protected-load board | Weak point may be the backup bus |
| Zero-export looks wrong on one phase | Review PCC metering and EMS | Phase handling and export control are separate jobs |
Imibuzo Ebuzwa Rhoqo
What usually unbalances a factory board?
Electricians may find lighting, controls, offices, heaters and small auxiliaries concentrated on one phase, even with balanced three-phase motor loads.
What does 100% single-phase unbalanced load mean on PMA?
The PCS can keep running with unequal phase demand. Total rating and phase-level electrical limits still apply.
Can PMA080 handle an unbalanced bottling hall?
Yes, provided the load meets the approved total-power and phase-current limits, including starting demand and temperature derating. MegSolid includes the unbalanced-load function in all three PMA models.
When is PMA0105 the better fit?
Assess PMA0105 for converter duty around 100 kW, with phase current and operating conditions within the approved limits.
When does PMA0125 become justified?
Select PMA0125 where the total-duty assessment requires that power class. Check L1 at its highest recorded load against phase-current and distribution limits before increasing PCS size.
Can one phase import while another exports?
Yes. An operator can record import on one phase and export on another with the three-phase total close to target.
What should be checked when phase flows look wrong at the PCC?
Check CT placement, the metering boundary and EMS target before attributing the flow to PCS size. Confirm whether City of Cape Town, another municipality or Eskom supplies the site.
Why does backup expose a phase problem that grid-tied running hides?
The utility supplies phase demand beyond PCS output during normal operation. After separation, the PCS has to carry the full load split on the protected bus.
Does PMA’s below-20 ms switching mean a below-20 ms outage at the load?
MegSolid’s figure covers PCS switching time. The installer must assess the full interruption at the load, including detection and transfer equipment.
Is 98.7% the round-trip efficiency of the complete BESS?
MegSolid specifies 98.7% as maximum PCS efficiency. Calculate complete BESS round-trip efficiency across the agreed system boundary.
Can overload replace a larger continuous rating?
Use the approved continuous limit for sustained duty. The published ≤110% entry specifies continuous operation; ≤120% has a two-minute limit and >120% a 200 ms limit.
Can PMA be installed outdoors as supplied?
The power compartment is IP20. Outdoor plant needs a suitable system enclosure.
Do City of Cape Town and Eskom use the same export rule?
No. Confirm the distributor, the SSEG or embedded-generation approval, and whether the site is export or reverse-power blocked before setting EMS limits.