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Juraj Nikolov avatar image
Juraj Nikolov asked

Which panels used to pull out max. mppt 250/100 performance

Hi, I'm new here, I've been looking for discussions, but I haven't found what I'm looking for. I would like to ask what (and how many "serial and parallel con.") Are photovoltaic panels used to extract maximum power (5800wp at 0-F) from mppt 250/100 with 48V battery in the system? What are the ideal parameters for the panel: VOC, Vmpp, Isc, Impp or other necessary parameters. Another question is to connect the "easy solar 5VKA" to the grid, but I don't want (I can't have) to supply electricity from Victron to the grid, or I need to use a dual switch like some. "TOQ5-100PV / 4P"? I just can't send electricity to the grid but I can take it from the grid if I need it :)


Thanks for help.

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2 Answers
wkirby avatar image
wkirby answered ·

There are many different types of PV panels you could use. Then whichever ones you decide to use they need to be connected in such a configuration to be compatible with your MPPT.

The choice of MPPT 250/100 and a 48V battery system gives you great flexibility.
The number one rule is to not exceed the 250V maximum string Voltage. This is the limit of the number of panels connected in series to keep under the 250V limit.
I'm not sure how cold 0°F is in real terms, but I think it is somewhere below the freezing point of water??? If so then you'd need to factor this in to your maximum series string Voltage. The Voltages written on the panels are usually for 25°C, and this Voltage increases as the panels get colder.

To maximise the output of the MPPT, you'd want it to produce the 100A charge current that it can provide. Size your array accordingly. If you have lots of sun then a 5KW array would be a good size.
If you don't have much sun then you could oversize the array to make more harvest in cloudy weather. The MPPT will safely limit to 100A even if the sun does come to visit occasionally.

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wkirby avatar image
wkirby answered ·

4 in series would be a better option to keep PV string Voltage high and less current in the PV circuit which means less loss in PV cables.
Then the MPPT will convert to low Voltage (48V) and high current to charge the battery.

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