Xav txog lub hnub ci nqi tswj raws li tus tswj hwm.Nws muab lub zog los ntawm PV array mus rau qhov system loads thiab lub txhab nyiaj roj teeb.Thaum lub txhab nyiaj roj teeb yuav luag tag, tus maub los yuav taper tawm ntawm qhov them tam sim no kom tswj tau qhov voltage uas yuav tsum tau ua kom them tag nrho cov roj teeb thiab ua kom nws tawm.Los ntawm muaj peev xwm tswj tau qhov voltage, lub hnub ci maub los tiv thaiv lub roj teeb.Lo lus tseem ceeb yog "tiv thaiv."Cov roj teeb tuaj yeem yog qhov kim tshaj plaws ntawm lub kaw lus, thiab lub hnub ci hluav taws xob tswj kev tiv thaiv lawv ntawm ob qho tib si overcharging thiab undercharging.

Lub luag haujlwm thib ob tuaj yeem nkag siab nyuaj dua, tab sis cov roj teeb khiav hauv "ib feem ntawm lub xeev-ntawm-tus nqi" tuaj yeem ua rau lawv lub neej luv heev.Lub sij hawm txuas ntxiv nrog rau ib feem ntawm lub xeev yuav ua rau cov hlau lead-acid roj teeb ua sulfated thiab txo lub neej expectancy, thiab lithium roj teeb chemistry muaj qhov sib npaug sib npaug rau qhov tsis zoo.Qhov tseeb, cov roj teeb khiav mus rau xoom tuaj yeem tua lawv sai.Yog li ntawd, kev tswj kev thauj khoom rau kev sib txuas DC hluav taws xob thauj khoom yog qhov tseem ceeb heev.Qhov tsis tshua muaj hluav taws xob cuam tshuam (LVD) hloov pauv nrog rau tus nqi tswj hwm tiv thaiv cov roj teeb los ntawm kev tso tawm ntau dhau.

Overcharging txhua hom roj teeb tuaj yeem ua rau muaj kev puas tsuaj tsis tuaj yeem.Cov roj teeb txhuas-acid ntau dhau tuaj yeem ua rau muaj roj ntau dhau uas tuaj yeem "boil" dej tam sim ntawd, ua rau lub roj teeb ntawm lub roj teeb puas los ntawm kev nthuav tawm lawv.Hauv qhov xwm txheej phem tshaj plaws, overheating thiab siab siab tuaj yeem ua rau tawg tshwm sim thaum tso tawm.

Feem ntau, cov tswj kev them nqi me me suav nrog kev tswj xyuas hluav taws xob.Ntawm cov maub los loj dua, cais cov kev tswj cov khoom siv hluav taws xob thiab cov relays kuj tseem siv tau rau kev tswj kev thauj khoom ntawm DC loads txog 45 lossis 60 Amps.Nrog rau tus nqi tswj hwm, tus tsav tsheb relay kuj tseem siv tau los hloov cov relays rau thiab tawm rau kev tswj kev thauj khoom.Tus neeg tsav tsheb relay suav nrog plaub txoj kev sib cais los ua qhov tseem ceeb tshaj qhov tseem ceeb tshaj plaws kom nyob twj ywm ntev dua qhov tseem ceeb dua.Nws kuj tseem muaj txiaj ntsig rau lub tshuab hluav taws xob tsis siv neeg pib tswj thiab ceeb toom ceeb toom.

Ntau lub hnub ci them nqi hluav taws xob kuj tseem tuaj yeem saib xyuas qhov kub thiab txias thiab kho cov roj teeb them kom zoo tshaj qhov kev them nyiaj raws li.Qhov no yog hu ua kub them nyiaj, uas tsub nqi rau ib tug ntau dua voltage nyob rau hauv txias txias thiab ib tug tsawg voltage thaum nws sov.