1

What is the current market for PHOTOVOLTAIC energy storage?

Qhov tseeb, qee lub tuam txhab inverter tau tsim thiab tsim lub zog cia inverters, tab sis tsuas yog rau Tebchaws Europe thiab Tebchaws Meskas thiab lwm lub lag luam thoob ntiaj teb, tsis yog rau hauv tsev, txawm tias nyob hauv tsev pv nyob rau hauv tag nrho viav vias xyoo 2017, ua rau muaj kev nkag siab me ntsis ntawm photovoltaic zog. khaws cia hauv Suav teb. Nws tsis yog txog rau xyoo no uas txoj cai tshiab tau tshaj tawm tias kev lag luam hauv tsev hluav taws xob hauv tsev tau pib tsim thiab dheev nkag mus rau pej xeem txoj kev pom.

Nws yog qhov tseeb vim tias nws yog nyob rau theem pib ntawm kev ua lag luam cog qoob loo uas qhov zoo ntawm cov neeg muab kev pabcuam tsis sib xws. Nyob rau tib lub sijhawm, cov txheej txheem kev teeb tsa ntawm lub zog cia cov chaw nres tsheb yuav nyuaj dua thiab cov kev xav tau ntawm kev txawj ntse yuav raug txhim kho ntau. Xaiv cov chaw muab kev pabcuam tsis tu ncua tuaj yeem zam ntau yam teeb meem tom qab.

02

What capacity of battery do I need?

Txhawm rau teb cov lus nug no, peb yuav tsum xub nkag siab txog kev them nqi thiab kev tso tawm ntawm cov chaw nres tsheb fais fab. Rau cov neeg nyob ib puag ncig, off-grid zog cia chaw nres tsheb tau siv dav dua.

Thaum nruab hnub, lub zog tsim los ntawm cov nroj tsuag photovoltaic yog qhov tseem ceeb rau cov tsev neeg, tab sis tsuas yog ib feem me me ntawm lub zog, vim tias tib neeg nyob hauv kev ua haujlwm nruab hnub, thiab ntau ntxiv yog khaws cia hauv cov roj teeb kom txog thaum nws them tag nrho. . Yog tias muaj qhov seem, nws mus rau kab sib chaws.

Thaum tsaus ntuj, cov roj teeb hluav taws xob hauv tsev, cov kab hluav taws xob muab cov khoom tsis txaus, thiab lwm yam. Daim duab hauv qab no qhia tau meej dua.

In Shanghai, the average monthly electricity consumption of the average household is about 400 KWH. Assuming that the electricity consumption is 100 KWH during the day and 300 KWH at night, the charge and discharge process can be completed once a day. Considering the limitation of charge and discharge loss and discharge depth of the energy storage battery, the battery with capacity of 14kWh is more appropriate. 0.8/10/0.9 = 13.9 kWh

Assumed conditions: charge and discharge efficiency 90%, discharge depth 80%

Nyob rau hauv cov xwm txheej zoo li no, cov chaw tsim hluav taws xob photovoltaic yuav tsum tsim kom muaj li 430 degrees ntawm lub zog ib hlis twg, thiab cov txheej txheem suav yog: 300/0.9 + 100 = 433 degrees. Tom qab ntawd lub peev xwm ntau npaum li cas cov chaw nres tsheb photovoltaic yuav tsum xaiv kom ua tiav?

Daim duab

Cov saum toj no yog lub zog tsim hluav taws xob txhua xyoo ntawm 5400W photovoltaic fais fab chaw nres tsheb hauv Pudong New Area ntawm Shanghai. Nws tag nrho cov tsim hluav taws xob txhua xyoo yog kwv yees li 5600 KWH, nrog qhov nruab nrab lub zog hluav taws xob txhua hli ntawm 471 KWH, ntau dua 433 KWH, qhov pib ua tau raws li cov kev xav tau saum toj no, nrog me ntsis ntxiv.

Feem ntau, nyob rau hauv cov xwm txheej uas qhov kev siv hluav taws xob txhua hli yog li 400 KWH (suav nrog 300 KWH thaum hmo ntuj), xaiv 5400W photovoltaic fais fab chaw nres tsheb thiab 14kWh lub zog cia roj teeb yuav yog qhov kev xaiv zoo dua, uas tuaj yeem them cov hluav taws xob xav tau ntawm cov tsev neeg zoo tib yam hauv feem ntau. Los ntawm lub sijhawm tus neeg siv mus txog tsev, lub roj teeb tau khaws cia txog 14 degrees ntawm lub zog, uas yog qhov yooj yim txaus rau kev siv hmo ntuj, nrog kev cia siab me ntsis ntawm daim phiaj pej xeem thiab qhov tseeb ntawm tus kheej txaus.

Of course, the above is only a very simple estimation scheme, and the actual application should also be combined with the user’s power consumption, especially in the summer peak power consumption and electricity attenuation, the energy storage battery will be appropriately overmatched.

03

Lub chaw nres tsheb fais fab raug nqi pes tsawg?

Yog tias tsuas muaj ib lo lus los piav txog tus nqi ntawm cov khoom siv hluav taws xob photovoltaic, nws yuav tsum tau kim heev. Lub Powerwall 13.5 degrees yog hais txog $ 6,600, lossis 45,144 yuan, lossis txog 3,344 yuan ib degree. Tus cwj pwm txheeb ze, cov lus hais ntawm cov chaw tsim khoom hauv tsev yog ntau yam zoo, feem ntau 1800 yuan / degree sab laug thiab sab xis, tab sis khaws 14 degrees ntawm hluav taws xob kom tau txais 25 txhiab.

Daim duab

And the total cost of a 5400W smart power station of 6.68 yuan /W is now about 36,000 yuan, equivalent to a markup of about 60%. It’s early days, but I’m sure there are plenty of geeks out there who want to try it first.

04

How often should the battery be replaced?

A common problem of lithium-ion batteries is aging, accompanied by power loss, but the aging rate is different. And the process is much faster than solar panels. While modules promise to decay by no more than 20% in 20 years, batteries can decay by 40% in about seven years. Although the nominal number of cycles can be up to 6,000, when the battery capacity is down to 60%, performance deteriorates and you need to consider replacing the battery in order not to affect the normal power experience.

Daim duab

Nyob rau ntawm lub sijhawm no, cov chaw tsim khoom txoj cai tom qab muag yog qhov tseem ceeb dua los xav txog. Cov tuam txhab roj teeb feem ntau muab kev tiv thaiv ntawm 5 mus rau 10 xyoo, tab sis txoj cai ntawm kev hloov roj teeb tsis meej, uas yuav tsum tau tsom mus rau.

05

Cov chaw nres tsheb hluav taws xob txuas hluav taws xob tam sim no puas tuaj yeem hloov kho dua tshiab?

Pom tseeb, nws tuaj yeem hloov kho mus rau qhov chaw nres tsheb hluav taws xob los ntawm kev txhim kho lub zog cia roj teeb thiab lwm yam khoom siv thiab tsuas yog hloov cov kab uas twb muaj lawm. Txawm li cas los xij, cov nyiaj pab uas twb muaj lawm yog qhov tseeb rau daim phiaj txuas nrog photovoltaic fais fab chaw nres tsheb. Thaum lawv tau hloov kho mus rau qhov chaw nres tsheb fais fab, hais lus nruj me ntsis, cov nyiaj pab cuam cuam tshuam yuav ploj mus.

Puas muaj txoj kev nyob ib puag ncig ntawd? Cia li cia koj xav txog qhov teeb meem, kuv ntseeg tias nws nyuaj rau poob.