ok ,suneagle thanks a lot , I just wanted to do that so I can have more battery capacity bank when connecting the 2 batteries as parallel so they will be more storage than I connect them series to get 24v ,,, so if they are parallel with 12v with 400amh then after battery , I use the stepup transformer from 12v to 24v going to inverter , so the amperage consumption will be lower in 24v than 12v...
. ( sorry I think I am not explaining clearly )
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A quality MPPT CC will provide the correct charging voltage to the battery as long as the voltage from the pv panels exceeds the desired battery voltage.
ie. For a 12V battery the input to the CC needs to be > 16V. For a 24V battery the input need to be > 32V. So if the input voltage was over 24V the CC will still regulate the charging voltage down to match the 12V battery voltage.
If you want to use a 24V interter then you should have a 24V battery. Using a step-up transformer (12V - 24V) may work a few times but it is inefficient and not the best practice. It is better to just match the battery voltage to the inverter input voltage.Leave a comment:
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thanks suneagle for reply,
actually not fully understand , let me try answer you :
about connecting the panels in series to get 24v , I know that but as I said I want to keep them without change (i wanted them providing 12v ) ,
about the CC mppt wont be important if I double the battery bank ?
also my batteries are GEL and I may increase the panel ,or connecting them in series as I said .
finally I am asking this just to know if it could work? cuz the question after that will be:
HOW ABOUT IF I PUT THAT STEPUP TRANSFORMER AFTER BATTERIES ? IF I KEEP MY SYSTEM 12v AND AFTER TRANSFORMER 24v THEN INVERTER ON 24v AND so on.Leave a comment:
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You can wire your "12v' panels in series which should provide a voltage high enough to charge a 24v battery system.
The key is having an MPPT CC which usually allows a higher input voltage and will still charge a 12V or 24V battery without any issues.
One thing to remember is trying to generate a C/10 charge rate for an FLA type battery. You can go a little higher or lower but that C/10 is optimum.
So for a 2 x 12v 200Ah battery system wired in parallel you get a 12v 400Ah system needed about 40 amps (400Ah/10).
Or you can wire those 2 x 12V 200Ah batteries in series and get a 24V 200Ah system needing about 20 amps (200Ah/10) for charging.Leave a comment:
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from12v to 24v with same items ....
hi all again....
I don't know if this topic can be here or any moderator can transfere it to suitable place ,
the question is :
if I have 12v system ( 12v panels , going to mppt charge controller 60amp sconnected to 2x battery each 200amh connected parallel ( bank 400amh), SO...
will it work if I use step up transformer from 12v to 24v fitted between panels and charge controller ??( I mean to keep the 12v panels without change )
putting in mind I will connect the 2x battery in series to be 24v system.
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