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Op imiza ion o Sys em E iciency and Ene gy Managemen in a Low-Vol age DC Sola
Gene a o
Uduak E im Udoka and Okon Nsa U o
Depa men o Compu e Enginee ing Technology, Akwa Ibom S a e Poly echnic, Iko
Osu ua, Akwa Ibom, Nige ia PMB 1200
ARTICLE INFO
ABSTRACT
Pape ID: Pape ID:
IJCA-68DC0BF2B3E83
Recei ed: 2025-09-02
Published: 2025-10-05
DOI:
h ps://dx.doi.o g
/10.5281/zenodo.17
330545
Page No: 192-202
The g owing demand o sus ainable and decen alized ene gy solu ions has made
low- ol age DC sola gene a o s c i ical o u al elec i ica ion, backup sys ems, and
small-scale applica ions. This s udy ocuses on he op imiza ion o sys em e iciency
and ene gy managemen in a 12 V low- ol age DC sola gene a o designed and
es ed unde eal ope a ing condi ions in Iko Ekpene, Akwa Ibom S a e, Nige ia.
The sys em in eg a es pho o ol aic modules, an MPPT-based cha ge con olle ,
li hium-ion s o age, and DC-compa ible loads, wi h pe o mance moni o ed unde
a ying i adiance. Resul s e eal ha while he PV a ay is a ed a 370 W, eal-
wo ld de a ing and con e sion losses educe usable AC powe o app oxima ely 253
W, highligh ing he gap be ween nominal and e ec i e capaci y. Compa a i e
analysis o se ies and pa allel a ay con igu a ions shows ha sys em design choices
di ec ly in luence wi ing losses, con olle limi s, and o e all eliabili y. Ba e y
s o age p o ed essen ial in b idging he gap be ween peak demand and in e mi en
sola gene a ion, wi h un ime analysis con i ming i s c i ical ole in sus aining
sys em loads. Fu he mo e, PV powe gain analysis demons a ed ha maximum
ene gy ha es occu s a midday, hough e iciency declines sligh ly a high
i adiance due o he mal e ec s. The indings unde sco e he impo ance o
in elligen ene gy managemen s a egies such as load p io i iza ion, op imized
ba e y cycling, and p edic i e con ol in maximizing usable ou pu . This s udy
concludes ha wi h p ope sys em op imiza ion, low- ol age DC sola gene a o s can
p o ide eliable, sus ainable, and cos -e ec i e ene gy o small- o medium-scale
applica ions, ad ancing Nige ia’s enewable ene gy ansi ion and imp o ing ene gy
access in unde se ed egions.
Keywo ds: Low- ol age DC sola gene a o , pho o ol aic sys ems, ene gy
managemen , sys em op imiza ion, MPPT, ba e y s o age
1. In oduc ion
The global shi owa ds enewable ene gy has placed sola powe a he cen e o sus ainable
ene gy gene a ion s a egies. Rising conce ns o e clima e change, deple ion o ossil uel
esou ces, and he p essing need o clean, decen alized ene gy solu ions ha e accele a ed
In e naonal Jou nal o Ad anced Scienfic and Technical
Resea ch
A ailable online on
hp://www. spublicaon.com/ijs /index.h ml
ISSN 2249-9954
Ci e This Pape : Uduak Em Udoka and Okon Nsa U o (2025). "Opmizaon o Sys em
Efficiency and Ene gy Managemen in a Low-Vol age DC Sola Gene a o ". INTERNATIONAL
JOURNAL OF ADVANCED SCIENTIFIC AND TECHNICAL RESEARCH (IJASTR), ol. 15, no. 5,
2025, pp. 192-202. DOI: h7ps://dx.doi.o g/10.5281/zenodo.17330545
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in es men s in sola echnologies. While la ge-scale pho o ol aic (PV) a ms domina e
discussions on sola ene gy, small-scale and low- ol age DC sola gene a o s a e equally
signi ican (Hassan e al.,2023; Soudaga e al.,2024; Mohammadi e al.,2020; Algbu i, e
al.,2024. They p o ide di ec ene gy access o u al communi ies, suppo po able ene gy
applica ions, and se e as eliable backup sys ems. Howe e , hei e ec i eness depends no
only on he capaci y o he PV panels bu also on he e iciency o he en i e sys em and he
managemen o gene a ed ene gy. Op imizing sys em e iciency and imp o ing ene gy
managemen a e he e o e cen al o unlocking he ull po en ial o low- ol age DC sola
gene a o s (Nwagu e al.,2025; Juanpe a e al.,2021; Bugaje, 2023).
Ali e al. (2025) in hei in es iga i e s udies obse ed ha sola ene gy con e sion e iciency
has long been a challenge while ad ances in PV cell echnology con inue o aise con e sion
a es. The o e all sys em o en su e s om losses in powe condi ioning, s o age, and load
managemen . Fo low- ol age sys ems, hese losses can be p opo ionally la ge , making
op imiza ion mo e c i ical. Ine iciencies in cha ge con olle s, in e e s, and ene gy s o age
uni s educe he usable powe a ailable, o en discou aging use s. As a esul , mos esea ch
has shi ed om ocusing solely on panel e iciency o a holis ic sys em-le el app oach. This
includes op imizing he in e ac ion be ween PV modules, ene gy s o age uni s such as ba e ies,
and load demand h ough ad anced ene gy managemen s a egies as illus a ed in Figu e 1
(Al-Ali e al.,2025; Ogundipe e al.,2024).
Figu e 1: Sola Powe Gene a ion
The concep o ene gy managemen in DC sola gene a o s is undamen ally abou balance.
Sola gene a ion is inhe en ly in e mi en , depending on sola i adiance, empe a u e, and
wea he condi ions. On he o he hand, use demand is i egula , a ying by ime o day and
he na u e o appliances connec ed. Wi hou in elligen managemen , his misma ch leads o
ei he was ed ene gy du ing peak gene a ion o sho ages du ing pe iods o high demand.
Ene gy managemen s a egies, he e o e, ensu e ha supply and demand a e ha monized
h ough echniques such as maximum powe poin acking (MPPT), sma cha ging and
discha ging cycles o ba e ies, load p io i iza ion, and p edic i e con ol algo i hms. In low-
ol age sys ems, whe e powe ma gins a e slim, such op imiza ion di ec ly imp o es eliabili y
and use sa is ac ion (Folo unso e al.,2025; Ba aneedha an e al.,2024).
The e iciency o low- ol age DC sola gene a o s also depends on educing con e sion losses.
Unlike AC-based sys ems, DC sys ems can ope a e wi h ewe con e sion s ages. Fo ins ance,
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loads such as LED ligh ing, lap ops, and ce ain communica ion de ices na i ely un on DC.
Elimina ing unnecessa y DC-AC o AC-DC con e sions no only educes losses bu also cu s
cos s. Howe e , e en wi hin DC sys ems, challenges exis . Vol age luc ua ions, he mal
losses, and imp ope load ma ching o en educe usable e iciency. Op imiza ion e o s,
he e o e, ex end beyond ha dwa e imp o emen s o include in elligen con ol s a egies ha
s abilize ol age, balance cu en s, and egula e powe dis ibu ion (Zdi i e al.,2023; Hassan
e al.,2024; Ka a & Uzunoglu, 2021). A c i ical componen in hese sys ems is he cha ge
con olle . I egula es he low o ene gy om he sola panels o he ba e y and he load.
T adi ional con olle s ely on simple on-o mechanisms ha o en ail o ex ac he maximum
ene gy a ailable om he PV modules. Mode n con olle s, howe e , inco po a e MPPT
algo i hms, which con inuously adjus he ope a ing poin o he sola a ay o achie e
maximum e iciency. In low- ol age gene a o s, MPPT is pa icula ly impac ul because he
a ailable ma gin be ween op imal and sub-op imal pe o mance is na ow. A well-designed
MPPT sys em can imp o e ene gy ha es by 20 o 30 pe cen , di ec ly enhancing sys em
eliabili y (Faizal e al.,2022; Pe dana e al.,2021).
Ene gy s o age plays an equally cen al ole in sys em op imiza ion. Ba e ies, ypically lead-
acid o li hium-ion, a e he backbone o o -g id sola sys ems. Howe e , hey a e also a sou ce
o ine iciency due o cha ging losses, sel -discha ge, and cycle deg ada ion. Op imizing
ba e y managemen in ol es no only e icien cha ging algo i hms bu also p edic i e models
ha ex end ba e y li e by a oiding deep discha ges and o e cha ging. In addi ion, hyb id
s o age sys ems ha in eg a e supe capaci o s o ansien loads a e gaining a en ion as hey
imp o e o e all sys em esponsi eness while p o ec ing he main ba e y om s ess. Fo low-
ol age sys ems, ca e ul ene gy s o age design ensu es s able ou pu and maximizes he
li espan o cos ly ba e y componen s (Hasan e al.,2025; Mage o e al., 2021; Hamdan e
al.,2024).
Beyond echnical aspec s, sys em op imiza ion also in ol es use beha iou and awa eness.
Many small-scale sola sys ems unde pe o m no because o ha dwa e limi a ions bu due o
misuse o lack o main enance. Educa ing use s on ene gy-e icien p ac ices, such as using
DC-compa ible appliances, scheduling high-load asks du ing peak sunligh hou s, and
main aining ba e ies p ope ly, complemen s echnical op imiza ion. Ene gy managemen hus
becomes bo h a echnological and social challenge, equi ing alignmen be ween sys em design
and use engagemen (Sooma e al.,2022; Kazem e al.,2022).
F om a b oade pe spec i e, he op imiza ion o low- ol age DC sola gene a o s has economic
and social implica ions. By maximizing ene gy e iciency, sys em cos s pe uni o usable
elec ici y a e educed, making sola solu ions mo e a o dable o low-income communi ies.
Enhanced eliabili y also inc eases use us and adop ion, which suppo s he g ow h o
decen alized enewable ene gy ma ke s (E ah e al.,2025; Naga aja e al.,2025). Fu he mo e,
op imized sys ems educe he dependence on diesel gene a o s, lowe ing emissions and
con ibu ing o clima e change mi iga ion. Fo u al elec i ica ion p ojec s, e icien and
in elligen ly managed sola gene a o s ep esen a pa hway o sus ainable de elopmen by
p o iding eliable powe o households, schools, heal h cen es, and mic o-en e p ises
(Panagoda e al.,2025; Naga aja e al.,2025).
In conclusion, he op imiza ion o sys em e iciency and ene gy managemen in low- ol age
DC sola gene a o s is no a singula ask bu a mul i-dimensional challenge. I encompasses
imp o emen s in PV ha es ing, s o age managemen , load p io i iza ion, he mal egula ion,
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and use engagemen . A i s co e, i is abou making he bes use o limi ed sola esou ces o
deli e eliable, sus ainable, and a o dable ene gy. As he demand o decen alized enewable
sys ems g ows, especially in unde se ed egions, he lessons lea ned om op imizing low-
ol age sola gene a o s will play a cen al ole in shaping u u e ene gy landscapes. This s udy
is he e o e dedica ed o ad ancing he unde s anding o how in eg a ed op imiza ion s a egies
can ans o m simple sola gene a o s in o obus ene gy solu ions capable o mee ing mode n
demands e icien ly.
2. Ma e ials and me hod
2.1 Sys em Componen s
The expe imen al se up o he s udy consis s o a low- ol age DC sola gene a o which is
designed o ope a e a 12 V. The ma e ials a e well illus a ed in Table 1.
Table 1: Ma e ial Componen o he S udy
S/N
Ma e ial Speci ica ion
1. Pho o ol aic (PV) Modules 2 x 185W
con igu ed o ensu e s able low- ol age
ou pu .
2 Cha ge Con olle 30A DC-DC con e e –based Maximum Powe Poin
T acking (MPPT)
3
Ba e y
12.6V, 110 Ah li hium
-
ion ba e y
3
In e e
Pu e sine wa e DC
–
AC in e e
wi h 12 VDC,
300
W
4
Load De ices
DC
-
compa ible appliances
5
Moni o ing Ins umen s
Digi al mul i
-
me e s
o moni o ol age luc ua ions
2.2 Expe imen al Se up
The PV modules we e ins alled ou doo s unde s anda d es condi ions and connec ed o he
cha ge con olle . The ba e y was linked downs eam o s o e ene gy, while loads we e
connec ed ia a egula ed DC bus. The MPPT con olle ensu ed ha he PV modules ope a ed
close o hei maximum powe poin despi e luc ua ions in i adiance and empe a u e. Da a
acquisi ion sys ems con inuously eco ded ol age, cu en , powe , and empe a u e a 1-
minu e in e als.
2.3 Da a Analysis and Op imiza ion App oach
The s udy adop ed a wo-s age me hodology. The i s one was sys em e iciency assessmen
which he baseline e iciency was de e mined by measu ing he a io o usable ou pu powe o
inciden sola powe o e a ying i adiance le els. Con e sion and s o age losses we e
quan i ied by compa ing inpu and ou pu a each s age (PV, con olle , ba e y, and load) as
shown in Figu e 2. Ano he app oach was he ene gy managemen s a egies. This in ol es
load p io i iza ion algo i hms we e implemen ed h ough he con olle o ensu e c i ical loads
ecei ed powe i s . Ba e y cha ging and discha ging cycles we e op imized by applying
s a e-o -cha ge (SOC) h esholds. Collec ed da a we e analyzed o e alua e sys em
pe o mance unde di e en ope a ing condi ions. The Key me ics included o e all sys em
e iciency, ba e y ound- ip e iciency, load sa is ac ion a e, and ene gy loss dis ibu ion.
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Resul s we e compa ed agains simula ed models o assess consis ency and alida e he
op imiza ion amewo k.
2.4 Sys em Design
Figu e 2: Block Diag am o he Sola DC gene a o
3. Resul and Discussion
3.1 PV Sys em Assump ions and Powe Flow
The design o he s udy has wo iden ical pho o ol aic (PV) panels, each a ed a 185 W.
Collec i ely, he a ay p oduces 370 W unde s anda d es condi ions. A e accoun ing o
eal-wo ld de a ing ac o s such as soiling, empe a u e, wi ing losses, and panel misma ch, he
usable powe alls o 296 W. Subsequen con e sion losses h ough he maximum powe poin
acking (MPPT) con olle and in e e educe he inal a ailable al e na ing cu en (AC)
ou pu o app oxima ely 253 W. This able illus a es a c ucial lesson in sola sys em design:
he namepla e capaci y o PV panels does no equa e o usable ou pu . Each s age in he sys em
in oduces e iciency losses, and in p ac ical deploymen , only abou 68% o he nominal
capaci y emains as usable AC powe .
3.2 Se ies s Pa allel A ay Con igu a ion o he Sys em
A compa ison o se ies and pa allel connec ions as shown in Figu e 3 shows ha while he
o e all powe ou pu emains cons an when an MPPT con olle is used, he elec ical
cha ac e is ics di e signi ican ly. A se ies connec ion doubles he ol age (36 V) while
main aining cu en a abou 10.3 A. In con as , a pa allel a angemen keeps he ol age a 18
V bu doubles he cu en o oughly 20.6 A. The choice be ween se ies and pa allel is no
i ial. Se ies con igu a ions educe cu en and hus lowe wi ing losses, making hem mo e
e icien o ansmission. Pa allel connec ions, howe e , equi e hea ie cabling and highe
cu en a ings bu may be necessa y in sys ems cons ained by con olle ol age limi s. The
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key akeaway is ha sys em designe s should p e e se ies connec ions, when possible, o
op imize e iciency, p o ided ha he con olle can handle he highe inpu ol age.
Figu e 3: Se ies s Pa allel A ay Con igu a ion
3.3 In e e Capabili y and Ba e y Suppo
The in e e is a ed a 350 W con inuous ou pu . To deli e his a 90% e iciency, i equi es
389 W o di ec cu en (DC) inpu , which co esponds o a ba e y discha ge cu en o abou
31 A a 12.6 V. Since he PV a ay can only sus ain 253 W unde op imal sunligh , he in e e
canno ope a e a i s ull a ing om sola powe alone. The sho all mus be supplemen ed by
he ba e y. This inding highligh s a limi a ion o he sys em: while he in e e is echnically
o e sized o he sola inpu , i depends hea ily on he ba e y o peak pe o mance. Designe s
mus he e o e ensu e ha he ba e y bank, cables, and uses a e a ed o handle discha ge
cu en s abo e 31 A sa ely. On ba e y un ime analysis, A un ime able ( see Table 2)
e alua es sys em pe o mance wi h wo ba e y sizes: 50 Ah and 100 Ah a 12.6 V. A 80%
dep h o discha ge (DoD), he 50 Ah ba e y p o ides abou 504 Wh o usable ene gy, while
he 100 Ah ba e y p o ides oughly 1,008 Wh. Unde PV-limi ed ope a ion (253 W), un imes
a e 2.0 and 4.0 hou s, espec i ely. A ull in e e load (350 W), un imes d op o 1.3 and 2.6
hou s. This analysis ein o ces he c i ical ole o ba e y s o age as shown in Table 2.
Table 2: In e e capabili y and ba e y-only ope a ion
Me ic Value
In e e a ed con inuous AC ou pu
350 W
DC inpu powe equi ed o 350 W AC @ 90% e
350 / 0.90 = 388.89 W
Ba e y DC cu en equi ed a 12.6 V o ull in e e ou pu
388.89 / 12.6 = 30.89 A
Wi hou adequa e capaci y, he sys em canno sus ain loads beyond a ew hou s. La ge
ba e ies no only ex end un ime bu also bu e in e mi en sola inpu , imp o ing o e all
eliabili y.
0 50 100 150 200 250 300 350 400
A ay Vmp
A ay Imp
Nominal PV powe
PV powe a e de a e (80%)
Powe a e con olle (95%)
Cha ging cu en in o 12.6 V ba e y
AC ou pu a ailable (a e in e e , 90%)
Pa allel connec ion (2 × 185 W) Se ies connec ion (2 × 185 W)
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3.4 Daily Load Audi
The load audi as shown in Table 3 p o ides a de ailed es ima e o he daily ene gy
equi emen s o he selec ed appliances and accesso ies in ended o use wi hin he sys em. The
analysis conside ed h ee main ca ego ies o loads: aine s’ accesso ies, aine s ope a ing a
5 V and 2 A, and LED bulbs o 15 W each. The ene gy demand o each i em was de e mined
by mul iplying he a ed powe o he appliance, he quan i y in use, and he numbe o hou s
o ope a ion pe day. F om he esul s, he aine s’ accesso ies con ibu e he leas o he daily
load p o ile wi h an es ima ed 20 Wh/day. This alue a ises om a single accesso y a ed a 10
W and ope a ed o only wo hou s daily esul ing in 720 Wh/day o al ene gy. Al hough he
consump ion is low, i is impo an o accoun o such auxilia y de ices because hey add o
he cumula i e sys em demand. he load audi e eals ha he ene gy demand is ela i ely
modes bu concen a ed in speci ic ca ego ies, pa icula ly he aine s. Such an analysis
emphasizes he impo ance o bo h e icien load managemen and accu a e sys em design. By
unde s anding he ela i e con ibu ion o each de ice, as enginee s can p io i ize ene gy-
sa ing s a egies, ensu e adequa e capaci y o c i ical loads, and a oid o e sizing o unde
sizing he sola ene gy sys em.
Table 3: Load Audi Table (Pe Day)
I em Q y
Powe (W) each
Hou s/day
Sub o al Ene gy (Wh/day)
T aine s Accesso ies
1
10
2
10 × 2 =
20 Wh
T aine s (5V, 2A)
10
10
4
10 × 10 × 4 =
400 Wh
LED bulbs (15 W)
5
15
4
5 × 15 × 4 =
300 Wh
Daily To al
720 Wh/day
3.5 Maximum Powe Gain by he PV Panel
Figu es 4 and 5 ep esen s he analysis ha ocuses on he pe o mance o pho o ol aic (PV)
sys ems unde he sola i adiance condi ions o Iko Ekpene, Akwa Ibom S a e, Nige ia. The
igu es illus a e he ela ionship be ween sola in ensi y and PV ou pu , p o iding insigh in o
he sys em’s e iciency, eliabili y, and po en ial o enewable ene gy deploymen in he egion.
Figu e 4 shows he powe gain o he PV sys em a peak sola i adiance. The esul s e eal
ha maximum powe gene a ion coincides wi h midday pe iods when sola adia ion is
s onges . This obse a ion aligns wi h he heo e ical pe o mance o PV cells, which con e
sola ene gy mo e e icien ly unde high i adiance. Howe e , e iciency d ops sligh ly beyond
ce ain i adiance h esholds due o hea build-up, which inc eases he in e nal esis ance o he
cells. This implies ha while he loca ion bene i s om high sola a ailabili y, e ec i e he mal
managemen s a egies, such as passi e cooling o ma e ial op imiza ion, a e necessa y o
sus ain long- e m e iciency.
Figu e 5 illus a es PV powe and ene gy ou pu a di e en ime in e als h oughou he day.
The g aph con i ms a di ec co ela ion be ween i adiance le els and ou pu , wi h mo ning
and e ening pe iods showing educed p oduc ion compa ed o midday peaks. The cumula i e
ene gy ou pu indica es ha he sys em is capable o p oducing su icien elec ici y o small-
o medium-scale applica ions i p ope ly sized. Impo an ly, he analysis sugges s ha
inco po a ing ene gy s o age (ba e ies) is i al o balance supply du ing pe iods o low
i adiance, ensu ing eliabili y o households and businesses.
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The indings highligh he s ong po en ial o PV sys ems in Akwa Ibom S a e, whe e abundan
sola esou ces can be ha nessed o mi iga e elec ici y sho ages. Wi h p ope in eg a ion o
s o age sys ems and e icien g id managemen , PV echnology could signi ican ly educe
dependence on ossil uels and enhance ene gy secu i y. Fu he mo e, scaling up PV
deploymen aligns wi h Nige ia’s na ional ene gy ansi ion agenda, o e ing socio-economic
bene i s such as job c ea ion, educed ca bon emissions, and cos sa ings o u al and u ban
consume s alike.
Figu e 4 : Powe Gain by he PV a maximum daily sola i adiance a Iko Ekpene Akwa
Ibom S a e Nige ia
Figu e 5: Plo o PV powe and ene gy ou pu a di e en ime in e al
0
200
400
600
800
1000
1200
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00 24:00:00
Ou pu Values (W)
Time (Hou s)
I adiance G (W/m²) Ideal PV powe (W) = 370·G/1000
0
50
100
150
200
250
300
350
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00 24:00:00
Ou pu Values (W)
Time (Hou s)
PV powe (W) × 0.84 Ene gy Ou pu /Hou
In e na ional Jou nal o Ad anced Scien i ic and Technical Resea ch ISSN 2249-9954
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O iginal A icle
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200
4. Conclusion
The s udy comp ehensi ely e alua ed he pe o mance and op imiza ion o a low- ol age DC
sola gene a o , e ealing ha sys em e iciency is s ongly in luenced by PV a ay
con igu a ion, s o age capaci y, in e e sizing, and ene gy managemen p ac ices. Despi e
being a ed a 370 W, he PV a ay yielded only abou 68% o i s nominal capaci y as usable
ou pu , unde sco ing he impo ance o accoun ing o eal-wo ld de a ing ac o s and
con e sion losses in design. The compa ison o se ies and pa allel con igu a ions con i med
ha design decisions mus balance ol age s abili y, cu en handling, and con olle
compa ibili y. Ba e y s o age eme ged as a cen al componen , no only o ex ending un ime
bu also o s abilizing supply du ing luc ua ions in i adiance.
The analysis o daily load equi emen s u he demons a ed he impo ance o p ecise audi ing
and p io i iza ion in p e en ing o e sizing o unde sizing, ensu ing ha c i ical loads ecei e
consis en supply. Addi ionally, he PV powe gain and ene gy ou pu ends a Iko Ekpene
highligh he egion’s s ong sola po en ial, wi h midday peaks p o iding subs an ial ene gy
ha can be ha nessed o small- o medium-scale applica ions. Howe e , e iciency d ops
du ing ex eme i adiance s ess he need o he mal egula ion and op imized ma e ial design.
O e all, he s udy concludes ha in elligen in eg a ion o MPPT con ol, op imized s o age,
and load p io i iza ion s a egies can signi ican ly imp o e he e iciency and eliabili y o low-
ol age DC sola sys ems. Fo Nige ia and simila egions acing powe accessibili y
challenges, such sys ems p esen a iable pa hway owa d decen alized enewable ene gy
deploymen . They o e socio-economic bene i s including enhanced ene gy secu i y, educed
eliance on ossil uels, and g ea e a o dabili y o u al and pe i-u ban communi ies. Fu u e
esea ch should ex end he analysis o seasonal a ia ions, ad anced s o age echnologies, and
AI-d i en p edic i e managemen o u he s eng hen sys em pe o mance and sus ainabili y.
Re e ences
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