He aha ngā Pūnaha Pūhiko Ngaohiko Teitei e Noho Paerewa Ana mō ngā Waka Hiko Arumoni

Me neke atu i te 10,000 amps te kaha o tētahi motuka whakatere 500 kW e rere ana i runga i tētahi pahi 48V. Ehara tēnā i te wero hangarau. He mea kāore e taea i runga i tētahi kaipuke he pono ngā ara taura, he herenga taumaha, he wāhi whakawhiti taputapu. Kāore te umanga moana i neke ki te ngaohiko teitei nā te mea i hiahia rātou. I neke rātou nā te mea kua pau noa te wāhi upoko o te ngaohiko iti.

E whakamārama ana tēnei aratohu i te take i puta ai te huringa, ngā āhuatanga o taua huringa, me ngā mea hei arotake i mua i te whakaae.

I roto i tēnei aratohu, ka hipokina e mātou:

• He aha i pā ai ngā hanganga ngaohiko iti ki te tuanui pakari o ngā kaipuke arumoni
• Te whai huatanga me te ōhanga o ngā pūnaha pākahiko moana ngaohiko teitei
• He hoahoa haumaru e āhei ai te whakamahi i te ngaohiko teitei ki te moana
• He aha te tiwhikete karaehe e whakatau ai ko ēhea pūnaha ka tae atu ki te wai
• Me pēhea te hurihanga o tētahi tūāpapa hei paerewa whānui mā te tauine ā-pūrere

Kei te pito whaimana o tēnei mākete a ROYPOW, me te Whakaaetanga Momo DNV me te tūāpapa whakamatao taiao e taea ai te whakaneke ake ki te 1000V. Ka whakahuatia e mātou i raro nei ētahi wā hei āwhina i te whakapūmau i tētahi kaupapa.

He aha i pā ai ngā pūnaha ngaohiko iti ki te tuanui

Kāore te ture a Ohm e whiriwhiri. Ko te mana he rite ki te ngaohiko kua whakareatia ki te iahiko. Kia iti te ngaohiko, ka pana ake te mana, ā, ka piki ake te iahiko i te ōwehenga tika.

Mō tētahi poti mahi iti me te motuka 20 kW, ka pai te mahi a te pahi 48V. Mō tētahi waka tere 40-mita te roa e tō ana i te 800 kW i te haerenga tere, ka hinga te hoahoanga kotahi i raro i tōna ake ahupūngao.

Te Raru o Nāianei, i roto i ngā Tau

Ko aua tau kei te taha maui ka huri hei raruraru taputapu tūturu:

• Ka kore e taea te whakahaere i te papatipu taura.Ko te kawe i te 10,000 amps me ine i ngā wāhanga parahi i roto i ngā mano mirimita tapawha. Mō tētahi kaipuke e rerekē ana te utu mō ia kirokaramu, he taumaha mate tēnā, kāore e taea te whakamārama.
• Ka tauinehia ngā ngaronga ātete ki te tapawhā o te iahiko.Mā te rua o te iahiko ka rua ake te wera e ngaro ana i roto i ngā kaiārahi hiko. I te iti o te ngaohiko, kāore tetahi wāhanga nui o tō pūngao kua rongoatia e tae atu ki te porotiti.
• Ka huri te āhua o ngā taputapu whakawhiti me ngā hononga ki tētahi mea hou.He nui te utu, he matotoru, ā, he uaua ki te tiki i ngā whati hiko, ngā whakapā hiko, me ngā pae pahi kua whakatauria mō te iahiko tonu e whā-mati te rahi.
• Ka whakanuia e ngā peeke whakarara ngā pūwāhi rahunga.Ko te ekenga ki te kaha whai hua i te 48V te tikanga he maha ngā aho whakarara. Ko ia hononga whakarara he take taurite anō, he piu anō, he wāhi tirotiro anō.

Ka hurihia katoatia e te ngaohiko teitei. He mana ōrite, he wāhanga iti noa iho o te iahiko, he iti rawa ngā kaiārahi hiko, ā, he iti rawa te mate wera puta noa i te mekameka tohatoha katoa.

Tohutohu ngaio:I te tirotiro i tētahi hanganga hou, tīmata mai i te hiahia nui ki te whakatere, ka mahi whakamuri ki te ngaohiko pahi. Ko te whiriwhiri i te pākahiko i te tuatahi, kātahi ka kitea te hiahia o nāianei i muri mai, koinei te huarahi e taea ai e ngā kaupapa te hanga anō i te taputapu whakawhiti i waenganui o te hanganga.

Mō tētahi tirohanga whānui ake ki te pai ake o te mahi a te matū konukōre i ngā kōwhiringa tawhito i roto i te ratonga moana, ka hipokina e te wehewehenga konukōre a ROYPOW ki te waikawa mata-mātā ngā kaupapa matua.

Ko te Ōhanga te Ārahi i te Whakamahinga Tauhokohoko

Mā te ahupūngao e whakamārama te mahi a te ngaohiko teitei. Mā te ōhanga e whakamārama te take e hokona ana e ngā rangatira.

E toru ngā tūāpapa e whakawhirinaki ana ki te take arumoni: te nekehanga wahie, te whakaiti i te tiaki, me te whakamahinga rawa. Ka honoa ia tūāpapa mō te roanga o te ora ratonga o te kaipuke.

Te Whakaiti i te Wahie me te OPEX

Kāore e tino whai hua te tahunga wahie o ngā waka hiko-tīhi i te kawenga hapa. Ko te nuinga o ngā hāora mahi a ngā miihini whakaputa hiko e tika ana mō te tono nui ka pau i raro iho i te whai huatanga tino pai, ka moumou wahie, ka tere ake te pakaru o te miihini.

Ka tino hurihia taua āhua e te pūnaha pākahiko. Ka mimiti i ngā kawenga tino kaha, ka taea e ngā kaihanga hiko te whakahaere i te wāhi pai rawa atu, ā, ka taea te whakahaere i ngā mahi iti te tono mā te pūngao kua rongoatia anake.

ROYPOW'sTe Ōhanga Hiko o te Ara Wai o uta 2026ngā tohu rangahauki tētahi45% te whakaiti i te OPEXme teWā whakahoki utu 3.5-taui runga i ngā whirihoranga kaipuke uta ranu, me te nekeneke pākahiko e hipoki ana i te 35-70% o te wā mahi i runga i te kōtaha huarahi.

Nō hea te pūtake o ngā penapena

Kei te neke kē te mākete

Ehara tēnei i te matapae. Kei te tupu inaianei. Ko te i noho te mākete pākahiko moana o te ao i te tata ki te$776 miriona i te tau 2025ā, e matapaetia ana ka eke ki$2.82 piriona i te tau 2033, he tere tipu ā-tau e tata ana ki te 18%.

Ka mau tonu te lithium-ion78% o te wāhi mākete pākahiko moana, me tata ki te65% o te wāhanga tono, e arahina ana e ngā waka tauranga, ngā kaipuke tautoko tai, me ngā rōpū kaipuke moana poto.

Kua huri te āhua o te whakataetae,hoki. Kāore te utu pūtau e wehewehe ana i ēnei rā. Ko te āheinga pūnaha whakauru me te whakaaetanga whakarōpūtanga ngā mea e tika ana.

Te Whai Wāhitanga Whakahou

Ko ngā whare hou e arohia ana. Ko te nui ake o ngā whare i te wā tata nei e ahu mai ana i ngā whakahoutanga.

Ko ngā kaipuke tawhito me ngā anga pakari me ngā pūnaha taraiwa mahi he turanga nui kua tāutahia, ā, mā te whakahoutanga pākahiko ranu ka penapena wawe te wahie me te kore utu whakapaipai o tētahi kaipuke hou. Nā ROYPOW ngā otinga whakahou hikokua hangaia ki te taha tonu o tēnei ara.

Te Hanganga Haumaru e Whai Hua ai

Anei te whakahē mārama: ka arahina te hiko e te wai moana, ā, he āhua mōrearea koretake te tāpiri i te 800 volts ki runga i te kaipuke.

He āwangawanga tika tēnei, ā, ehara te whakautu i te whakamanawa. He mahi hangarau tēnei.

He aha te LiFePO4 i noho ai hei Paerewa Moana

Mā te kōwhiringa matū ka whakatakoto te taumata haumaru i mua i te tāpiri i tētahi pūnaha tiaki. Kua noho te phosphate rino lithium (LFP) hei mea noa mō ngā tono moana arumoni mō ngā take tūturu:

• Te paepae rerenga wera teitei ake.He nui ake te wera e hiahiatia ana e ngā pūtau LFP hei tomo ki te rerenga wera i ngā matū e hangai ana ki te nikara.
• Hanganga katote pumau.Kāore te here phosphate e tuku i te hāora i raro i te ahotea wera pērā i ngā cathode waikura paparua, e tango ana i te pūtake wahie tuatahi i roto i te ahi pūtau.
• Te roa o te huringa.Ka eke pahikara ngā kaipuke arumoni i ia rā. Ka whakahaerehia e te LFP taua mahi puta noa i ngā mano tini huringa me te kore e tino heke te kaha o te mahi.
• Ngā whanonga e taea te matapae i raro i te tukino.He iti ake ngā hua pūngao e puta mai ana i te kuru, te werohanga, me te whakamātautau utu nui atu i ngā matū rerekē.

Te te whakataurite i waenga i te phosphate rino lithium me te lithium tuatorui runga i te blog a ROYPOW ka hohonu ake te kōrero mō ngā taupatupatu matū.

Te Tiakitanga Taumata-maha i roto i te Mahi

He paparanga tiaki pūnaha moana kua whaimana kia kore ai he hapa kotahi e puta he aituā taumata-pūnaha. E whakaatu ana te tūāpapa moana ngaohiko-tiketike a ROYPOW i te huarahi paerewa:

• Te wehenga rere wera taumata-pūtau kore mahi.Ki te rahua tētahi pūtau, ka āraia e ngā ārai ā-tinana te horapa ki ngā pūtau tata. Ka whakamātauhia kia kore ai e puta he horapa mai i te pūtau ki te pūtau.
• Pūnaha tinei ahi whakauru.Kua whakauruhia te taputapu ki roto i te pākahiko hei ārai i ngā mōrearea ahi.
• Te parenga utu nui rawa atu.Ka mahi motuhake te paparanga tiaki tuarua i te BMS, nō reira kāore te parenga utu nui e tangohia e te hapa pūnaha whakahaere.
• Pūtāhui ohorere waea pūmau.Te aukati ohorere ā-rohe i runga i te pouaka whakahaere tohatoha me te āheinga aukati ohorere mamao, e rua e whakawhirinaki ana ki te waea mārō kaua ki te pūmanawa.
• Te honohono i te taumata kete me te taumata PDU.Te parenga ara iahiko poto i ngā taumata motuhake e rua o te hoahoanga.
• Ngā takirere whakarewa ātete-pahū.Kua whakauruhia ki te tuarongo o ia putea, ā, kua hangaia hei hononga tika ki te paipa whakaputa hau, kia tukuna marietia ai te hau e puta ana i waho o te wāhi pākahiko.
• Te tiakitanga urunga IP67.He hiri katoa mai i te rehu tote, te haumākū, me te horoinga, he mea e kore e taea te whiriwhiri i roto i te taiao moana.
• He haumaru motuhake mō te kore e pāngia e te pāmahana nui.Ka whakaoho te pāmahana pūtau-kotahi i te mahi tiaki, ahakoa kāore i te aro ki te porowhita whakahaere matua.

Ka mahi tonu te BMS

He koretake, he mea whakaoho rānei ia paparanga i runga ake nei. Ko te pūnaha whakahaere pākahiko te wāhanga e whakahaere ana i ia hēkona e mahi ana te ipu, e aroturuki ana i te ngaohiko pūtau, te pāmahana, te iahiko, me te āhua o te utu puta noa i ngā rau pūtau pea.

I runga i tētahi pūnaha kua hoahoatia pai, ka hono atu hoki te BMS ki ngā pūnaha whakahaere hiko waka me ngā inverters, ka tohatoha raraunga ki te piriti, kaua ki te mahi hei pouaka pango motuhake. Kua whakamātauhia te BMS a ROYPOW i te mara me ngā tūāpapa inverter me PMS nui tae atu ki a Victron Energy.

Tohutohu ngaio:I te wā e hokohoko ana, pātaihia mēnā kua whakatinanahia te ārai-whakatipu rere-wera.kua whakamatautauria, kua tuhia hoki, ehara i te mea i hangaia mō te mea anake. Ko te rerekētanga i waenga i te kaupapa hoahoa me te hua whakamātautau i kitea ko te rerekētanga i waenga i te kereme me te tiwhikete.

Mō tētahi whakamārama hōhonu ake mō ngā kaupapa matua o te whakahaere pākahiko, tirohia a ROYPOW's aratohu ki ngā pūnaha BMShe tīmatanga pakari.

He aha te Tiwhikete Akomanga e Whakatau ana i ngā Mea Katoa

Ka taea e koe te hanga i tētahi pūnaha pākahiko tino pai, engari kāore tonu e taea te whakatakoto ki runga i tētahi kaipuke arumoni. Ki te kore he whakaaetanga a te rōpū whakarōpū, e kore e tae ki te wai.

Koinei te tātari e wehewehe ana i ngā kaiwhakarato pākahiko moana mai i ngā kaiwhakarato pākahiko ahumahi e hoko ana ki ngā ratonga pākahiko moana.

Te Tikanga Tuturu o te Whakaaetanga Momo DNV

He rōpū whakarōpū me te tiwhikete a DNV (Det Norske Veritas) nō Nōwei e mōhiotia ana puta noa i te rāngai moana. Mā te Whakaaetanga Momo DNV e whakaū kua aromatawaitia te pūnaha pākahiko ki ngā whakaritenga haumaru me te mahi moana e mōhiotia ana o te ao.

Mō te kaipupuri kaipuke, he maha ngā mahi a taua tiwhikete i te wā kotahi:

• Ka whakangāwari i te whakaaetanga kaipuke.Ka arotakehia te ipu e ngā rōpū karaehe, ehara i te pākahiko, ina kua whakaaetia te momo pākahiko.
• Ka whakaiti i te mōrearea o te kaupapa.Ko te korenga o te tiwhikete i waenganui o te hanganga tētahi o ngā hua tino utu nui i roto i tētahi kaupapa hanga hou.
• Ka wetewete i te pūtea.He maha ngā wā ka whakarārangihia te whakaaetanga akomanga hei whakaritenga hoko e ngā kaupapa hiko me te tango waro e tautokona ana e te kāwanatanga.
• Ka whakatū i te inihua.He pai ake te aromatawai a ngā kaitātari inihua i ngā tāutanga pākahiko ina tuhia te whakaaetanga karaehe.

Ngā Tiwhikete e Hiahiatia ana

Ngā pūnaha pākahiko lithium moana a ROYPOW i whiwhi Whakaaetanga Momo DNV, ā, kei roto hoki i te tūāpapa te whakaritenga o te UN 38.3. Mō ngā kaupapa e aro ana ki te whakarōpūtanga ABS, ka taea te whakamahi anō i ngā rekoata whakamātautau DNV o nāianei hei whakatere i te tukanga, kaua ki te tīmata i te whakamātautau mai i te kore.

Te Pātai Whakamatao

Kotahi te painga whai hua o te tiwhikete e tika ana kia tohua:whakamatao taiao.

Ka whakauruhia e ngā pūnaha pākahiko moana wai-whakamatao ngā papu, ngā raina whakamatao, ngā whakawhiti wera, me te kimi turuturu, ā, ka tāpirihia katoatia e ēnei ngā momo rahunga, te kawenga tiaki, me te uaua o te tiwhikete. Ka tangohia e te hoahoa matao taiao taua pūnaha katoa.

He iti ake ngā wāhanga e neke ana. He iti ake ngā mea hei tirotiro. He iti ake ngā mea e rahua ana i te moana.

Te Tauinetanga Āhuahira puta noa i te Rōpū Waka Katoa

Koinei te wāhi e pekehia ana e te nuinga o ngā kōrero mō te hiko moana, ā, koinei pea te tautohe kaha rawa atu mō te ngaohiko teitei heipaerewakaua ko te kōwhiringa takitahi.

Kāore i te maha ngā wā ka whakahaerehia e te kaiwhakahaere arumoni tētahi momo kaipuke kotahi. Tērā pea he waka tō, he waka kawe pāhihi, me ētahi poti mahi e rua a te kaiwhakahaere tauranga. I ngā wā o mua, me whai pūnaha hiko motuhake ia poti.

Ka tino hurihia taua whārite e te hoahoanga ngaohiko teitei modular.

Kotahi te Pūhara, He maha ngā Whirihoranga

He waeine paerewa te poraka hanga. I runga i te pūnaha a ROYPOW, he waeine 51.2V, 320Ah te taumaha, 117kg. Ka honoa ngā kōwae i roto i te raupapa hei whakatutuki i te ngaohiko pahi e hiahiatia ana, ā, ka honoa hoki i roto i te whakarara hei whakatutuki i te kaha pūngao e hiahiatia ana.

Mai i taua kōwae kotahi, ka whānui haere te pūnaha puta noa i tētahi whānuitanga nui:

Ngā Hua o te Paerewatanga i roto i te Whakahaere

He whai hua te ngāwari o te hangarau. Ko ngā hua whakahaere te mea e penapena moni ai:

• Kotahi te rarangi o ngā wāhanga e manawapa ana.Kotahi te momo kōwae e kapi ana i ngā kaipuke katoa o te rōpū kaipuke. Kāore he pupuri taonga motuhake mō ia kaipuke.
• Kotahi te kaupapa whakangungu.Kotahi te pūnaha e akohia ana e ngā kaimahi me ngā tohunga hangarau takutai, kaua e rima.
• Kotahi te kōtaha whakauru.Ka noho rite tonu te hototahi o te inverter, te whakawhitiwhiti kōrero PMS, me te whanonga BMS puta noa i te kahui waka.
• Te whānui e taea te matapae.Ko te tāpiri i te kaha ki tētahi kaipuke o nāianei ko te tāpiri i ngā kōwae, ehara i te mea ko te hanga anō i te pūnaha hiko.
• Te whakamanatanga māmā ake mō ngā kaipuke e whai ake nei.Mā te tāutanga tuatahi kua whakaaetia ka whakatūria he tauira mō te tāutanga e whai ake nei.

Te Whakaōrite i te Whirihoranga ki te Mahi Waka

He rerekē ngā momo oko e whakararu ana i te pūnaha pākahiko, ā, ka taea te whakahaere i ia mea me te kore he hoahoa motuhake mā te huarahi modular:

• Ngā poti tōme pupuhi te mana poto, kaha i te wā e tōia ana te pou. He mea nui ake te kaha tukunga tihi teitei i te pūngao katoa.
• Waka terewhakahaere i ngā ara e taea te matapae me ngā matapihi utu pumau. Ko te kaha pūngao me te reiti whakaae utu te mea nui rawa atu.
• Ngā kaipuke tautoko o te moaname whai kawenga hōtēra pumau me te tautoko tūnga hihiri, e pai ake ai ngā whirihoranga pūngao nui ake me te tukunga kaha tonu.
• Ngā waka mahi ikaā, he maha ngā wā ka whakahaerehia e ngā poti mahi ngā momo ranu, ko te pākahiko te mea e whakahaere ana i te kawe tere iti, ā, ko te whakaputa hiko te mea e whakahaere ana i ngā huringa mahi taumaha.

Kei te wātea te papaaho moana a ROYPOW i ngā wāhi e rua MBmax16.3Hme MBmax14.3Hngā whirihoranga, e kapi ana i ngā kaipuke hiko me ngā kaipuke ranu me ngā papaaho tai.

Tohutohu ngaio:I te aromatawai i ngā kaiwhakarato, pātai atu kia hiamotuhakengā momo kōwae e hiahiatia ana e tā rātou tūāpapa hei kapi i tō whānuitanga katoa o ngā waka. E wha ngā momo kōwae e hiahiatia ana e te kaiwhakarato hei mahi i ngā momo waka e wha, e wha ngā rarangi taonga, e wha ngā ara whakangungu, me ngā huinga mōrearea whakauru e wha.

Mō ētahi atu kōrero mō te whanaketanga o te hangarau pākahiko moana puta noa i ngā tono arumoni, tirohia te pou a ROYPOW i runga i ngā whanaketanga i roto i te rokiroki pūngao moanae whakarato ana i te horopaki whai hua.

Tuhia te Ara ki mua me ROYPOW

Kua mutu te ngaohiko teitei hei kōwhiringa whakahirahira, ā, kua noho hei kōwhiringa whaihua. E whakakorehia ana e te pāngarau o nāianei te ngaohiko iti i runga ake i tētahi paepae hiko, e tautokona ana e te ōhanga te mahi ranu, ā, kua riro te tiwhikete akomanga hei kuaha me haere mā roto i ngā kaupapa nui katoa.

Ngā mea matua hei ako mai i tēnei aratohu:

• Kāore e whai hua te hanganga ngaohiko iti i runga ake i te 100-200 kW o te kawenga pana.
• Ka tapahia te iahiko e te ngaohiko pahi teitei ake, ka whakaitihia te papatipu taura, te ngaronga wera, me te utu taputapu whakawhiti
• Ka tukuna e ngā whirihoranga ranu he whakahekenga OPEX tata ki te 45% me te utu tata ki te 3.5 tau i runga i ngā huarahi uta.
• Ko LiFePO4 te paerewa matū moana mō te pumau o te wera me te huringa ora
• Ko te tikanga o te haumaru maha-taumata ko te wehenga pūtau kore mahi, te tiaki i te utu nui rawa, ngā aukati-e kua waeahia, me te hiri IP67
• He kuaha hoko te Whakaaetanga Momo DNV, ehara i te tohu hokohoko
• Ka tangohia e te whakamatao taiao ngā papu, ngā raina whakamatao, me te kāwai katoa o ngā aratau rahunga
• Mā te hoahoanga tauira kotahi ka taea te whakamahi i ngā waka tō,ngā kaipuke utanga,ngā waka tere, ngā OSV, me ngā poti mahi puta noa i te kahui katoa

Pūnaha pākahiko moana lithium ngaohiko teitei a ROYPOWKei a ia te Whakaae Momo DNV, mai i te 32.7 kWh ki te 2,785 kWh puta noa i te awhe 102.4V ki te 870.4V, ā, ka rere i runga i te whakamatao taiao me te tiaki IP67 puta noa. Ahakoa kei te whakarite koe i tētahi hanganga hou, kei te whakamahere rānei i tētahi whakahou, ka taea e tā rātou tīma te whakataurite i tētahi whirihoranga ki tō kōtaha mahi tuturu. Tīmata i te whārangi whakapā.

Ngā Pātai Auau

He aha te pūnaha pākahiko moana ngaohiko teitei?

He pūnaha pākahiko moana e mahi ana i waenga i te 100V me te 1000V pea, i hangaia hei whakakaha i te whakaterenga o ngā waka hiko, waka ranu rānei, me te whakaiti i te iahiko, te rahi o te taura, me te ngaronga pūngao.

He aha i hiahia ai ngā kaipuke arumoni ki te hiko teitei, kaua ki te 48V?

Ko te iti o te ngaohiko e hiahia ana ki te iahiko teitei rawa atu i ngā kawenga whakatere arumoni. Ka tukuna e te pūnaha 800V te mana ōrite i te kotahi tekau mā ono o te iahiko o te pahi 48V.

He haumaru te pūnaha pākahiko ngaohiko teitei i runga i te kaipuke?

Āe. Ka whakakotahi ngā pūnaha whaimana i te matū LiFePO4, te wehenga wera taumata-pūtau kore mahi, te tiakitanga utu nui kore, ngā aukati ohorere kua waeahia, me te hiri IP67 puta noa.

He aha te hiranga o te tiwhikete DNV mō ngā pākahiko moana?

Mā te Whakaaetanga Momo DNV e whakaū te tutuki i ngā paerewa haumaru moana o te ao. Ka whakangāwari i te whakaaetanga kaipuke, ka tautoko i te inihua, ā, he maha ngā wā e hiahiatia ana mō ngā kaupapa hiko kua utua.

Ko ēhea ngā waka e tino whai hua ana mai i ngā pūnaha pākahiko ngaohiko teitei?

Ngā waka tere, ngā poti tō, ngā kaipuke tautoko tai, ngā poti mahi, ngā kaipuke mahi ika, me ngā waka tere, inā koa ko ērā e rere ana i ngā huarahi e taea te matapae, e ngā mahi tere puhoi rānei.

Ka taea e te pūnaha pākahiko moana te mahi tahi me ngā whakaputa hiko tīhiera?

Āe. Mā ngā whirihoranga ranu ka taea e ngā miihini whakaputa hiko te whakahaere i te tino pai o te mahi, i te mea ka taea e te pākahiko te tiaki i ngā pikaunga me te mahi iti te tono, ka whakaiti i te whakapaunga wahie me ngā hāora miihini.