Kuv twb poob suav pes tsawg zaus ib tug neeg tau hu kuv nug yog vim li cas lawv "200Ah roj teeb lub txhab nyiaj" khiav tawm cov kua txiv tom qab tsuas yog 3 teev thaum tus lej hais tias nws yuav tsum kav 8. Cov lus teb luv luv? Tus lej Ah ntawm daim ntawv lo tsis txhais hais tias cov neeg feem coob xav tias nws txhais li cas.
Ah txhais li cas ntawm lub roj teeb?Nws sawv cev rau ampere -teev- ib qho kev ntsuas ntawm qhov hluav taws xob ntau npaum li cas lub khw muag roj teeb. Xav txog nws zoo li lub tank roj hauv lub tsheb. Lub 100-gallon tank qhia koj lub peev xwm, tab sis nws tsis qhia koj tias koj yuav tsav mus deb npaum li cas. Qhov ntawd yog nyob ntawm seb koj lub tsheb thauj khoom, thaj av, huab cua, thiab seb koj lub cav puas yog roj-sipper lossis gas-guzzler.
Cov roj teeb ua haujlwm ib yam nkaus. Kev ntsuas 100Ah txhais tau hais tias lub roj teeb tuaj yeem xa 100 amps rau ib teev, lossis 10 amps rau kaum teev, lossis 1 amp rau ib puas teev. Tab sis "theoretically" tab tom ua ntau hnyav nqa hauv kab lus ntawd.
Nov yog qhov tseem ceeb rau txhua tus neeg yuav roj teeb rau lub chaw lag luam, kev lag luam thaub qab, lossis qhov chaw siv hluav taws xob: nkag siab qhov sib txawv ntawm cov ntawv luam tawm ntawm cov ntaub ntawv thiab dab tsi tshwm sim hauv ntiaj teb tiag. Tau qhov no tsis yog lawm, thiab koj tab tom them nyiaj rau lub peev xwm koj yuav tsis siv lossis scrambling thaum koj lub kaw lus thaub qab kais tawm nruab nrab - hluav taws xob.
Tus lej yog qhov yooj yim. Qhov Tseeb Tsis yog.
Cov qauv yooj yim yuav tsis yooj yim dua:
Lub sijhawm ua haujlwm=Roj teeb muaj peev xwm (Ah) ÷ Load Tam sim no (A)
Puas muaj 100Ah roj teeb? Khiav 10-amp load? Qhov ntawd yog 10 teev ntawm runtime. Ua tiav.
Tsuas yog... tsis tiag. Kuv yeej tsis tau pom lub roj teeb ua tau muab nws lub peev xwm ntsuas tag nrho sab nraud ntawm chav kuaj. Nov yog vim li cas tus qauv ntawd poob sib nrug hauv thaj teb:
Qhov Discharge Rate Teeb meem
Cov tuam txhab roj teeb ntsuas lub peev xwm nyob rau hauv cov xwm txheej tshwj xeeb- feem ntau qeeb, maj mam tso tawm ntau dua 20 teev (hu ua tus nqi C / 20). Koj lub roj teeb 100Ah tau txais qhov ntsuas ntawd los ntawm kev kos 5 amps rau 20 teev ncaj.
Tab sis koj lub kaw lus thaub qab tsis kos 5 amps. Nws kos 50. Los yog 100. Thiab thaum koj rub tam sim no sai, koj tsis tau mus nyob qhov twg ze ntawm lub peev xwm ntsuas.
Qhov kub thiab txias Factor
Roj teeb ntxub huab cua txias yuav luag ntau npaum li kuv ua. Ntawm qhov txias txias, koj tsuas tuaj yeem tau txais 70-75% ntawm lub peev xwm ntsuas. Ntawm -20 degree? Koj tab tom saib tej zaum ib nrab.
|
Kub |
Yam Koj Tau Txais |
|---|---|
|
25 ° F (77 ° F) |
Tag nrho cov peev txheej |
|
0℃(32℃F) |
Txog 75-80% |
|
-20 ° F (-4 ° F) |
Tej zaum 50-60% |
Kuv muaj ib tus neeg siv khoom hauv Minnesota uas spec'd lawv cov kev sib tham sab nraum zoov raws li kev ua haujlwm rau lub caij ntuj sov. Thawj qhov txias snap, lub kaw lus ua tsis tiav. Nqe lus kawm.
Chemistry Gap
Qhov no yog qhov loj, thiab nws yog qhov uas kuv pom qhov yuam kev kim tshaj plaws.
A 100Ah lead-acid roj teeb thiab 100Ah lithium roj teeb tsis zoo ib yam. Tsis txawm nyob ze. Nws zoo li muab piv rau 100-gallon tank nyob rau hauv ib lub sedan piv rau ib tug semi-tsheb thauj mus los tib tus naj npawb, sib txawv kiag li siv tau ntau yam.
Vim li cas Lead -Acid thiab Lithium Ah Ratings tsis tuaj yeem muab piv ncaj qha
Rov qab rau xyoo 1800s lig, tus kws tshawb fawb German hu ua Wilhelm Peukert tau pom qee yam tsis yooj yim: qhov nrawm dua koj lub roj teeb, qhov tsawg dua tag nrho koj tawm ntawm nws. Nws lej tseem haunts rau peb niaj hnub no.
Ntawm no yog cov tswv yim version: Lead-acid roj teeb muaj kev tiv thaiv sab hauv siab. Thaum koj rub tam sim no hnyav, ntau lub zog tau nkim thaum tshav kub hauv lub roj teeb es tsis txhob siv koj cov khoom siv. Lub Peukert exponent quantifies qhov no - lead-acid roj teeb feem ntau tau qhab nia 1.2 txog 1.6, txhais tau tias muaj peev xwm poob qis hauv kev thauj khoom.
Lithium roj teeb? Lawv Peukert exponent yog nyob ib ncig ntawm 1.02 txog 1.05. Yuav luag negligible. Koj tau txais yuav luag tag nrho cov peev txheej tsis hais qhov nyuaj npaum li cas koj rub.
Daim ntawv piav qhia: Cov hlau lead-acid roj teeb nyob ntawm 100Ah tsuas yog xa tawm li 55Ah thaum tso tawm ntau dua 2 teev es tsis txhob siv 20. Lub roj teeb lithium xa tawm 98Ah nyob rau hauv tib lub sijhawm. Tib daim ntawv lo, kev ua haujlwm sib txawv heev.
Tab sis nws tau ua phem rau cov hmoov lead -acid. Koj kuj siv tsis tau tag nrho lub peev xwm yam tsis tua lub roj teeb.
Sib sib zog nqus- tso tawm cov hlau lead-acid roj teeb tsis tu ncua qis dua 50% lub xeev ntawm kev them nqi, thiab koj yuav ua rau nws lub neej luv luv. Feem ntau cov tuam ntxhab pom zoo kom nyob siab dua 50%- txhais tau tias koj "100Ah" roj teeb tiag tiag muab rau koj 50Ah ntawm lub peev xwm siv tau.
Lithium roj teeb tswj 80-90% qhov tob ntawm kev tso tawm ib txwm, qee qhov txawm tias 100%. Koj 100Ah lithium roj teeb xa 80-90Ah ntawm lub peev xwm siv tau.
Cia kuv muab tus lej tiag rau ntawm no:
|
Qhov Koj Muab piv |
Lead-Acid (100Ah ntsuas) |
LiFePO4 (100Ah ntsuas) |
|
Rated peev |
100 Aw |
100 Aw |
|
Siv tau qhov tob ntawm qhov tso tawm |
50% |
80% |
|
Peukert poob ntawm kev thauj khoom |
~15% |
~3% |
|
Yam koj tau txais tiag tiag |
~42 Aw |
~77 Aw |
Same Ah rating. Lub lithium roj teeb muab ze li ob npaug ntawm lub zog siv tau.
Peb pom qhov no ua si tas li nyob rau hauv telecom thiab industrial retrofits. Ib txoj haujlwm tsis ntev los no tau koom nrog lub chaw nres tsheb hauv xov tooj hauv chaw taws teeb uas tau tso siab rau qhov hnyav 400Ah lead-acid bank. Tus neeg teb xov tooj tau ntxhov siab vim tias qhov hluav taws xob sag tau ua rau qis qis - qhov hluav taws xob txiav tawm tom qab tsuas yog 3 teev ntawm lub zog thaub qab - deb ntawm lawv qhov kev xav tau 6-teev.
Peb hloov lub txhab nyiaj loj ntawd nrog 200Ah 48V LiFePO4 khib modules -technically ib nrab ntawm qhov ntsuas "nameplate" muaj peev xwm. Qhov tshwm sim? Cov txheej txheem tshiab tau muab ntau dua 5 teev ntawm lub sijhawm ua haujlwm ruaj khov vim tias nws tsis raug kev txom nyem los ntawm Peukert poob hauv qhov chaw hnyav. Tus neeg siv khoom tau txais ntau dua 60% tiag tiag-lub sijhawm ua haujlwm thoob ntiaj teb los ntawm qhov system uas hnyav 60% tsawg dua. Qhov ntawd yog qhov txawv ntawmnkag siab tias Ah txhais li cas ntawm lub roj teebnyob rau hauv kev xav piv rau qhov nws xa hauv kev xyaum.
Cov C-Qhov Kev Ntsuas ntawm Cov Ntawv Qhia Tshwj Xeeb txhais tau li cas
Thaum koj khawb rau hauv cov ntaub ntawv roj teeb, koj yuav pom muaj peev xwm teev ntawm qhov sib txawv "C- tus nqi." Qhov no tsis yog kev lag luam fluff- nws qhia koj raws nraim li cas cov chaw tsim khoom kuaj tus lej ntawd.
C/20 txhais tau hais tias lub roj teeb tau tso tawm ntau tshaj 20 teev. C/10 txhais tau tias 10 teev. C/5 txhais tau tias 5 teev.
Kev ntes: cov tuam txhab sib txawv siv cov C- sib txawv rau lawv cov lus qhia tshwj xeeb. Qee lub tuam txhab siv nyiaj xeem ntawm C / 100 (kev tso tawm 100-teev) kom nce lawv cov lej Ah. Qhov ntawd 100Ah roj teeb kuaj ntawm C / 100? Nws tsuas yog xa 70Ah ntawm C / 20 tus nqi uas cov tuam txhab hwm siv tau.
Ua ntej sib piv ob lub roj teeb, xyuas qhov C- tus nqi. Yog tias lawv txawv, qhov sib piv tsis muaj qab hau.
|
C-Rate |
Lub Sijhawm Tso Tawm |
Tam sim no Draw (100Ah roj teeb) |
|
C/100 |
100 teev |
1A |
|
C/20 |
20 teev |
5A |
|
C/10 |
10 teev |
10A |
|
C/5 |
5 hnu |
20A |
|
C/2 |
2 teev |
50A |
Kev kuaj xyuas ceev ceev: yog tias lub roj teeb zoo li tsis muaj tseeb ntawm tus nqi -ib -Ah, xyuas seb C- tus nqi uas lawv siv. Koj feem ntau pom cov roj teeb "kev sib tw" tau sim nyob rau hauv cov xwm txheej tsis muaj dab tsi zoo li koj daim ntawv thov tiag tiag.
Ah vs. Wh vs. kWh: Tau Txais Koj Cov Tsev Ncaj Ncees
Qhov no ua rau tib neeg mus tas li. Cia kuv tshem nws.
Ah (ampere - teev)qhia rau koj them peev xwm -ntau npaum li cas tam sim no ntau npaum li cas lub sij hawm.
Wh (watt- teev)qhia koj lub zog muaj peev xwm- siv lub zog tiag tiag rau kev ntsuas hluav taws xob.
Kev hloov pauv:Zog (Wh)=Peev Xwm (Ah) × Voltage (V)
Lub roj teeb 12V, 100Ah khaws 1,200Wh. Lub roj teeb 48V, 100Ah khaws 4,800Wh.
Plaub zaug qhov hluav taws xob, plaub npaug ntawm lub zog-txawm tias ob leeg hais "100Ah" ntawm daim ntawv lo.
Thaum koj tab tom sib piv cov lus los ntawm cov neeg muag khoom sib txawv, ib txwm hloov mus rau Wh lossis kWh. Kuv tau pom pawg neeg yuav khoom yuam kev yuam kev vim tias lawv piv Ah tus lej hla ntau qhov sib txawv.
Kev siv ceev ceev rau kev teeb tsa ntau:
|
Kev teeb tsa |
Ah Rating |
Qhov hluav taws xob |
Lub zog tiag tiag |
|
Ib qho 12V module |
100 Aw |
12V |
1.2 kWh os |
|
4S configuration |
100 Aw |
48V |
4.8 kWh e |
|
High -v taws xob khib |
100 Aw |
400V |
40 kWh |
Daim ntawv thov tiag tiag: Sib piv Ah rau koj qhov xav tau tiag tiag
Txaus txoj kev xav. Cia peb tham txog lub peev xwm koj xav tau tiag tiag rau kev lag luam thiab kev lag luam.
Thaub qab fais fab rau qhov tseem ceeb Loads
Cov txheej txheem sizing pib nrog koj qhov kev kuaj xyuas load. Dab tsi tiag tiag yuav tsum nyob twj ywm thaum lub sijhawm hluav taws xob, thiab ntev npaum li cas?
Nov yog li cas kuv taug kev cov neeg siv khoom los ntawm nws:
Kauj ruam 1: Sau txhua qhov tseem ceeb load thiab nws tam sim no kos
Teeb pom kev kub ceev: 5A
Kev ruaj ntseg systems: 3A
Network / IT khoom: 15A
HVAC tswj: 8A
Total UAS: 31 A
Kauj Ruam 2: Txheeb xyuas lub sijhawm ua haujlwm yuav tsum tau ua
Yam yuav tsum tau muaj: 4 teev kom txog thaum lub tshuab hluav taws xob ncaws hauv lossis daim phiaj rov qab
Kauj Ruam 3: Xam cov peev txheej
31A × 4 teev=124Ah yam tsawg kawg nkaus
Kauj Ruam 4: Siv qhov tiag - ntiaj teb yam
Yog siv lead-acid ntawm 50% DoD: 124 ÷ 0.50=248Ah
Yog tias siv LiFePO4 ntawm 80% DoD: 124 ÷ 0.80=155Ah
Ntxiv 15% aging margin: 285Ah (lead-acid) lossis 178Ah (lithium)
Kauj Ruam 5: Hloov mus rau qhov ntau thiab tsawg
Lead{0}}acid: 300Ah system
LiFePO4: 200Ah system
Tib daim ntawv thov. Lub lithium system yog me dua, sib dua, thiab feem ntau pheej yig dua nws lub neej txawm tias tus nqi siab dua.
Peak Shaving thiab Demand Charge Reduction
Kev suav sib txawv kiag li. Ntawm no koj nyob nraum sizing raws li qhov xav tau spike koj yuav tsum tau chais plaub hau thiab lub sij hawm ntawm koj lub siab xav tau qhov rais.
Yog tias koj lub chaw ntaus 500kW siab tshaj thaum lub sijhawm 2-teev tav su qhov rais, thiab koj xav chais 200kW tawm lub ncov ntawd:
Lub zog xav tau: 200kW × 2 teev=400kWh
Rau 400V qhov system: 400,000Wh ÷ 400V=1,000Ah
Tab sis koj kuj yuav tsum tau account rau inverter efficiency (~ 95%) thiab qhov tob ntawm paug txwv. Tiag - ntiaj teb qhov loj me yuav yog 1,200-1,300Ah ntawm 400V.
Sizing rau ncov shaving yuav tsum saib tshaj qhov yooj yim Ah kev ntaus nqi mus rau siab -C- tus nqi ua tau zoo. Tsis ntev los no peb tau siv 215kWh ua kua-C&I txee txias rau cov chaw tsim khoom uas ntsib cov nqi xav tau hnyav. Lawv yuav tsum tau tso tawm sai sai kom ua kom lub zog loj dua 15 feeb txhua tav su.
Ib tug qauv "zog-cell" roj teeb yuav muaj overheated los yog sagged nyob rau hauv voltage raws li qhov kev siv. Los ntawm kev ntsuas lub kaw lus nrog siab - cov hlwb ua tau zoo uas muaj peev xwm ua tau raws li 1C tso tawm, peb tau pab lub chaw txiav lawv cov nqi xav tau los ntawm kwv yees li $ 2,800 toj ib hlis. Lub kaw lus them nyiaj rau nws tus kheej hauv tsuas yog 3.5 xyoo xwb- tsis yog vim nws muaj qhov siab tshaj Ah qhov ntsuas ntawm daim ntawv, tab sis vim tias nws tuaj yeem xa lub hwj chim tiag tiag thaum daim phiaj xav tau nce siab.
Solar + Storage Systems
Thaum sib txuas cov roj teeb nrog lub hnub ci, koj nyob nraum ntsuas ob yam: khaws cia hnub nyoog txaus los npog cov khoom thauj thaum yav tsaus ntuj, thiab muaj peev xwm txaus rau huab cua -hnub resilience.
Lub hnub ci kev lag luam ib txwm siv hnub ci- ntxiv rau- lub kaw lus cia yuav loj dua lub txhab nyiaj roj teeb ntawm 2-4 teev ntawm qhov nruab nrab ntawm qhov nruab nrab. Yog tias koj lub chaw khiav haujlwm 50kW nruab nrab thaum yav tsaus ntuj thiab koj xav tau 3 teev cia:
50kW × 3 teev=150kWh
Qhov no yog qhov twgPolinovel lub txee sab nraum zoov BESS kev daws teeb meemfeem ntau haum zoo-lawv tau tsim los rau qhov zoo ntawm kev lag luam hnub ci kev sib koom ua ke, nrog lub peev xwm ntawm 120kWh mus txog ze li 1MWh hauv kev teeb tsa modular.
Cov chij liab thaum ntsuas cov khoom siv roj teeb
Tom qab xyoo hauv qhov kev lag luam no, kuv tau tsim ib qho zoo nkauj txhim khu kev qha BS detector rau roj teeb specs. Nov yog dab tsi los saib:
Muaj peev xwm kuaj ntawm qhov tsis muaj tseeb C- tus nqi
Yog hais tias tus naj npawb Ah xov tooj raug kuaj ntawm C / 100 tab sis koj daim ntawv thov tso tawm ntawm C / 5, qhov spec tsis muaj txiaj ntsig rau koj. Nug cov ntaub ntawv muaj peev xwm ntawm koj qhov kev tso tawm tiag tiag.
Tsis muaj qhov kub thiab txias specifications
Txhua qhov chaw tsim khoom raug cai luam tawm muaj peev xwm derating nkhaus rau qhov kub thiab txias. Yog tias lawv tsuas muab ib tus lej rau koj uas tsis muaj qhov ntsuas kub, lawv tab tom zais qee yam.
Lub voj voog lub neej thov yam tsis muaj DoD ntsiab lus
"10,000 cycles" suab zoo heev kom txog thaum koj nyeem cov ntawv zoo thiab pom tias yog 50% qhov tob ntawm qhov tso tawm. Ntawm 80% DoD, tib lub roj teeb yuav tsuas kav 4,000 lub voj voog. Ib txwm nug: cycles ntawm dab tsi DoD?
Tsis muaj cov ntaub ntawv Peukert rau lead-acid
Yog hais tias ib tug lead-acid roj teeb manufacturers yuav tsis qhia rau koj lub Peukert exponent los yog muab lub peev xwm nkhaus ntawm tus nqi sib txawv, taug kev deb. Lawv paub lawv cov lej saib tsis zoo.
"Equivalent Ah" kev ntaus nqi
Qee cov tuam txhab lag luam-tshwj xeeb tshaj yog nyob rau hauv qhov chaw lithium- siv "sib npaug Ah" cov qhab nia uas sib piv lawv cov roj teeb rau cov hmoov lead-acid. Lub roj teeb uas sau tias "100Ah sib npaug" yuav yog 50Ah. Nws tsis yog technically dag, tab sis nws tau tsim los ua rau koj tsis meej pem.
Nyob rau hauv peb lub chaw kuaj engineering, peb nruj me ntsis validate txhua cell batch ua ntej nws mus rau hauv ib tug module. Peb ib txwm tsis lees txais "kev sib cog lus" cov hlwb uas thov cov qib siab Ah tab sis ua tsis tiav hauv kev thauj khoom. Piv txwv li, peb tsis ntev los no tau sim cov qauv ntawm tes los ntawm tus neeg muag khoom sab nraud uas ua tau zoo ntawm 1 amp (C / 100) tab sis vau rau 65Ah thaum peb rub 50 amps (0.5C)- ib qho kev thauj khoom raug rau cov tshuab ua haujlwm.
Tias yog vim li cas peb cov ntaub ntawv cov cai tswjfwm nruj: peb ntsuas pebkev lag luam BESS muaj peev xwmraws li kev ua haujlwm tiag tiag, tsis yog kev tawm dag zog. Yog tias tus neeg muag khoom yuav tsis qhia koj qhov kev nthuav tawm ntawm 0.5C lossis 1C, lawv tab tom zais qhov tseeb ntawm lawv cov roj teeb.
Sizing rau daim phiaj-Scale thiab Containerized BESS
Rau kev siv hluav taws xob- nplai tej yaam num, peb tsis tau tham txog ib tus neeg Ah kev ntaus nqi ntxiv lawm- peb tab tom tham txog cov peev txheej MWh ua los ntawm ntau txhiab lub hlwb.
Tab sisnkag siab tias Ah txhais li cas ntawm lub roj teebntawm qib cell tseem tseem ceeb, vim tias nws pab koj ntsuas qhov system tsim thiab ntes cov lus qhia yuam kev.
Nov yog qhov lej lej ua haujlwm li cas rau lub kaw lus raug kaw:
Ib hom cell hom yog 280Ah LiFePO4 prismatic cell ntawm 3.2V nominal.
Lub zog ib leeg: 280Ah × 3.2V=896Wh ≈ 0.9kWh
Rau ib lub thawv 5MWh: 5,000kWh ÷ 0.9kWh=~ 5,556 hlwb xav tau
Cov hlwb no tau teem rau hauv cov hlua txuas (los tsim qhov hluav taws xob) thiab cov hlua sib txuas (kom muaj peev xwm). Ib tug raug configuration tej zaum yuav yog:
16 hlwb hauv series=51.2V module
Ntau lub modules hauv series=400-800V khib
Ntau racks nyob rau hauv parallel=phiaj MWh muaj peev xwm
Thaum ntsuas cov ntawv ntim khoom ntim BESS, txheeb xyuas:
Cell -level Ah rating thiab manufacturers
Series / parallel configuration
Tag nrho suav cov zog sib tw tau thov muaj peev xwm
Round -kev ua haujlwm zoo (feem ntau 85-92%)
Kev siv hluav taws xob pab (txias, BMS) uas txo cov peev txheej siv tau
Polinovel's containerized BESS systemsntau ntawm 3.85MWh txog 5MWh + ib lub thawv, siv LiFePO4 hlwb tshwj xeeb rau lawv lub neej zoo tshaj plaws thiab thermal stability nyob rau hauv siab - ceev installation.
Cov kab hauv qab ntawm roj teeb Ah Ratings
Saib,Ah txhais li cas ntawm lub roj teebtsis nyuaj rau txoj kev xav. Nws yog ib qho kev ntsuas ntawm tus nqi peev. Muab ntau los ntawm qhov voltage kom tau txais lub zog. Faib los ntawm load tam sim no los kwv yees runtime.
Qhov nyuaj yog los ntawm tag nrho cov tiag tiag - ntiaj teb yam tseem ceeb uas cuam tshuam qhov kev muaj peev xwm theoretical: qhov cuam tshuam tus nqi tawm mus, qhov kub thiab txias derating, qhov tob- ntawm - txwv tsis pub tawm, thiab qhov sib txawv ntawm chemistry.
Cov neeg siv khoom kuv ua haujlwm nrog uas zam qhov yuam kev kim yog cov uas:
Ib txwm hloov mus rau usable kWh, tsis nameplate Ah
Txheeb xyuas qhov C- tus nqi siv rau kev kuaj muaj peev xwm
Siv qhov kub thiab txias derating rau lawv qhov chaw tshwj xeeb
Qhov loj me rau lithium qhov txiaj ntsig tiag tiag tsis yog kho txhua tus Ah li sib npaug
Nug cov neeg muab khoom siv rau cov ntaub ntawv ntawm lawv qhov kev ua haujlwm tiag tiag, tsis yog lub chaw kuaj mob
Ua tsib yam no, thiab koj yuav spec systems uas ua tau raws li qhov xav tau.
Cov lus nug nquag
Q: Puas siab dua Ah ib txwm zoo dua?
A: Tsis tas li. Higher Ah txhais tau tias muaj peev xwm ntau dua, tab sis nws kuj txhais tau tias hnyav dua, ntau qhov chaw, thiab tus nqi siab dua. Lub hom phiaj yog ua kom muaj peev xwm ua tau raws li koj qhov kev xav tau tiag tiag -oversizing nkim nyiaj, undersizing ua rau poob. Xam koj qhov peev xwm siv tau ua ntej, tom qab ntawd xaiv raws li.
Q: Kuv puas tuaj yeem hloov lub roj teeb - kua qaub nrog lub roj teeb lithium ntawm tib qhov kev ntsuas Ah?
A: Koj yuav tau txais lub zog siv tau ntau dua los ntawm qis dua -Ah lithium roj teeb. Lub roj teeb 100Ah LiFePO4 feem ntau muab lub peev xwm siv tau ntau dua li 150Ah lead-acid roj teeb. Thaum retrofitting, xam raws li usable kWh, tsis nameplate Ah.
Q: Kuv yuav xam pes tsawg lub roj teeb yuav kav ntev npaum li cas?
A: Basic formula: Runtime (teev)=Usable Capacity (Ah) ÷ Load Current (A). Tab sis "usable peev" tsis yog tib yam li cov peev txheej ntsuas. Rau cov hmoov lead-acid, muab cov ntsuas Ah los ntawm 0.4-0.5. Rau lithium, muab 0.75-0.85. Tom qab ntawd siv qhov ntsuas kub yog tias koj ua haujlwm sab nraud 20-25 degree.
Q: Qhov txawv ntawm Ah thiab mAh yog dab tsi?
A: Tsuas yog ntsuas . 1 Ah=1,000 mAh. Cov roj teeb me me (xov tooj, laptops) siv mAh vim tias cov lej nyeem tau ntau dua. Cov roj teeb loj (tsheb, muaj, BESS) siv Ah. Lub xov tooj 5,000mAh roj teeb yog 5Ah.
Q: Vim li cas qee lub roj teeb sau ntau qhov kev ntsuas Ah?
A: Lawv tab tom qhia lub peev xwm ntawm qhov sib txawv ntawm qhov tso tawm. Lub roj teeb yuav raug ntsuas 100Ah ntawm C / 20, 85Ah ntawm C / 10, thiab 70Ah ntawm C / 5. Qhov kev pom tseeb no yog qhov qhia tau zoo- nws txhais tau hais tias cov chaw tsim khoom tau ua siab ncaj txog kev ua tau zoo hauv ntiaj teb no.
Q: Qhov ntsuas kub cuam tshuam li cas Ah muaj peev xwm?
A: Txias txo qhov muaj peev xwm loj heev - cia siab tias 70-80% ntawm qhov khov, 50-60% ntawm -20℃. Thaum tshav kub kub tsis txo qhov peev xwm tam sim ntawd, tab sis ua kom lub zog degradation dhau sijhawm. Rau kev teeb tsa sab nraum zoov, ib txwm suav nrog kev tswj xyuas thermal lossis derate peev xwm rau koj qhov kev nyab xeeb.
Cov ntaub ntawv
Peukert, W. (1897). "Uber die Abhängigkeit der Kapazität von der Entladestromstärke bei Bleiakkumulatoren." Elektrotechnische Zeitschrift.
Roj teeb University. "BU-503: Yuav ua li cas xam roj teeb Runtime." Batteryuniversity.com
PIB 1188-2005. "IEEE Pom Zoo Qhia Txog Kev Saib Xyuas, Kev Ntsuas, thiab Hloov Cov Roj Teeb VRLA rau Daim Ntawv Thov Chaw Nyob."
IEC 61427 1: 2013. "Secondary cells thiab roj teeb rau lub zog tauj dua tshiab-Cov kev cai dav dav thiab cov qauv ntawm kev sim."