Two solutions for electricity supply for Centre
in Tanzania with PV-generator as electricity supply
A central system
A decentral system
Central PV system, 230 Volt AC Supply:
A central PV system, collect
all the PV generators and batteries to central location and
distribute 230 VAC to the consumers, this gives the opportunity
to control the resources and lead the energy to were it is
needed. This gives an easy module cleaning and
a easy liquid maintenance of batteries a better security. With
this system the installations procedures are quite similar
a normal 230 VAC installation.
The 230 VAC supplies give the opportunity to buy and use standard
installation materiel and electric security description.
230 Volt AC, central system provide:
· Low distributions cost with cable dimensions
· Better infrastructure, under peak loads from shared
consumer (water pumps)
· Standard low cost installations materiel
· Opportunity to use low cost lowenergy lights
· No polarity protection
· Low cable looses
· Standard installation materiel and electric security
description
· Standard 230 VAC consumer and electric security description
· The negative about use off transformer to 230 VAC
is that this will provide a 15%-20% loos depending of the
load
Decentral PV- system, 12 Volt DC supply
Use of this types of PV-generator are best suited for houses
that stands alone and doesn't have shared consumers system
like a normal demand where every house/consumer have there
own PV- module, battery, charge controller and inverter if
needed. In that case they are dimensioned for their specifications and peak
loads this can demand a greater battery bank. It will also reduce
the mobility of the energy flow to each house, and the maintenance
area will decrease. Installation materiel has to be polarity
protected and dimensioned for high currents. Lowenergy
lights must be provided with a electronic device that produce
high frequents which provide a loss about 10-15% of load.
The positive effects of this system will be that every house
will have complete control over their own PV - generator.
Which can have influence in the behaviour and use of elec-tricity.
12 Volt DC, decentral system provide:
· Will require solar module, charge controller batteries
· High cost for 12 VDC installation materiel (polarity
secure)
· High cost for 12 VDC consumer (polarity secure)
· High distributions cost with cable dimensions.
· No infrastructure under peak loads from shared consumer
(water pump).
· Greater battery bank
· Transformer loos to supply high frequents for lowenergy
lights and other 230 VAC consumer (10%-15% loos depending
of the load)
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