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Hi all, I am totally new to solar tech and so I really need your help in solving an issue. I am using a 5KVA inverter, with 4 batteries. This was connected as a 48v battery system, for which I have tried installing a solar charging system. To do this I bought:
- 6 200W 24V 5.4A solar panels.
- A 48V, 60A mppt charge controller, with a working voltage of 70V.
I initially connected the solar panels on my roof as follows -
I divided the 6 solar panels into 3 sets of 2 and I connected each set in series, to get 48V (2 in series), and then I connected the 3 sets in parallel to get about 15A.
After connecting the controller the display showed an average of 77V and on the first day, this was successful in fully charging my low inverter batteries. (though there was an intermittent govt power supply).
The problems started after the batteries became full and I started using my inverter. The battery voltage kept going down while my solar system din't work to give it any charge, even though the voltage continued to vary between 75V and 80V. I complained about this to the seller of my controller and he claimed that the panels should have been configured differently, i.e I should have configured it as follows -
2 sets of 3, meaning that 3 solar panels will be in series thereby giving 72V and the two sets of 3 would be connected in parallel giving about 10A.
I did as he said and the voltage I see on the controller is an average of 115V. I also see 75V and above even in the early light hours of 7am each morning, but the controller still doesn't charge the batteries constantly, it sometimes does so for seconds and stops.
So my question is, if the solar panels are bad as the charge controller seller claims, will his controller still get the voltage it is getting, and is it possible to keep getting above the minimum voltage for the charge controller (70V) and not be getting current at all from the panels. Kindly help answer this, because it is confusing.
- 6 200W 24V 5.4A solar panels.
- A 48V, 60A mppt charge controller, with a working voltage of 70V.
I initially connected the solar panels on my roof as follows -
I divided the 6 solar panels into 3 sets of 2 and I connected each set in series, to get 48V (2 in series), and then I connected the 3 sets in parallel to get about 15A.
After connecting the controller the display showed an average of 77V and on the first day, this was successful in fully charging my low inverter batteries. (though there was an intermittent govt power supply).
The problems started after the batteries became full and I started using my inverter. The battery voltage kept going down while my solar system din't work to give it any charge, even though the voltage continued to vary between 75V and 80V. I complained about this to the seller of my controller and he claimed that the panels should have been configured differently, i.e I should have configured it as follows -
2 sets of 3, meaning that 3 solar panels will be in series thereby giving 72V and the two sets of 3 would be connected in parallel giving about 10A.
I did as he said and the voltage I see on the controller is an average of 115V. I also see 75V and above even in the early light hours of 7am each morning, but the controller still doesn't charge the batteries constantly, it sometimes does so for seconds and stops.
So my question is, if the solar panels are bad as the charge controller seller claims, will his controller still get the voltage it is getting, and is it possible to keep getting above the minimum voltage for the charge controller (70V) and not be getting current at all from the panels. Kindly help answer this, because it is confusing.
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