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Topics: How Can be selected the system battery voltage for Module on Solar Energy
#1
Start by
Pradip Sarker,M.Eng(Elec), P.Eng
02-27-2014 07:04 AM

How Can be selected the system battery voltage for Module

Any one can suggest How Can be selected the system battery voltage for Module spec below:.CS5P-220M Pmax=220W Vmp=47.0V Imp=4.68A Voc=58.8V (Temp coeff. -0.35%) Isc=5.01A
02-27-2014 09:29 AM
Top #2
Fadi Maalouf, PMP
02-27-2014 09:29 AM
To answer your question, one needs to know the qty of solar modules. Is it one or more?
02-27-2014 11:42 AM
Top #3
Pradip Sarker,M.Eng(Elec), P.Eng
02-27-2014 11:42 AM
If I one to use 1 module
02-27-2014 02:39 PM
Top #4
Jason Lee
02-27-2014 02:39 PM
with your module specification, you can only use 24V battery system. But i will recommend you to use a MPPT charge controller.
02-27-2014 05:31 PM
Top #5
Pradip Sarker,M.Eng(Elec), P.Eng
02-27-2014 05:31 PM
Thanks for all of your comments.
02-27-2014 08:01 PM
Top #6
MUKUL VERDIA
02-27-2014 08:01 PM
if the Vmp is 47 volts then you can use 12/24/v System . For a single module use there is no point of using a MPPT Controller .Simple PWM based Controller would do good . They are cheaper . like the one from Steca , 12/24 v 10a controller .
02-27-2014 10:48 PM
Top #7
Fadi Maalouf, PMP
02-27-2014 10:48 PM
Pradip,
General rule of thumb:
1- For charging 12VDC battery bank using standard PWM controller, your module(s) Voc should be around 22VDC (Vp around 18VDC).
2- For charging 24VDC battery bank using standard PWM controller, your module(s) Voc should be around 44VDC (Vp around 36VDC).
3- Your selected module does not meet those requirements and hence you can NOT use standard PWM controller. Your module Voc (even for 24 VDC battery bank) exceeds the standard PWM controller Voc input (max Voc is nomally 47 VDC for Steca).
4- Finally, your best solution is to use MPPT controller with your selected module. You can use Steca model Solarix MPPT 2010 to charge your 12 VDC or 24 VDC battery bank.
02-28-2014 01:25 AM
Top #8
Jason Lee
02-28-2014 01:25 AM
Dear Fadi,

Thank you for helping to explain in detail.
02-28-2014 04:10 AM
Top #9
James Swonger
02-28-2014 04:10 AM
You can use about any battery you like, if you have a DC-DC converter in the charge controller lineup. I'd base my selection on what you have for the final stage (intertie or local-use AC inverter, is my guess). You will probably find more support for 12V (automotive) and 48V (telecom) if you are looking for a 60Hz output. You will not lose much efficiency at a 4:1 stepdown ratio with a buck converter. I expect that you can find plenty of telecom-market DC-DCs to pore over.
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