Choosing a MPPT regulator

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landry.g
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Choosing a MPPT regulator




by landry.g » 28/05/18, 14:16

hello, I want to know which regulator mppt choose for my instalation, I am novice ... a little help will be welcome!

here I have 2 solar panels sheuten

pmax 210W
ump 26.3V
imp 7.99A
iSC 8.45A
uoc 33.3V
max sys volt 1000V
over pro 15A

first of all can you confirm to me that they are 24v? if ump greater than 24v we have 24v no?

then, how to choose an adequate reg mppt? calculation of amperage, voltage, safety standard ...

additional info: all the rest of my install is in victron, phoenix converter 12 / 800 and gel battery 12v 165ah.

does everything seem to you coherent?

ps: I just burned a regimen 100 / 15 victron, hence my desire to understand the calculations to choose a suitable regulator.
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Gaston
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Re: Choosing a MPPT regulator




by Gaston » 28/05/18, 18:49

Well, according to the information, both panels are in 24V and they can provide 8A.

If you connect the panels in parallel, you get 24V, 16A.
If you connect them in series, it is 48V, 8A.

Since you only use one 12V battery, you need to find a regulator that accepts different voltages between the input and the battery.
The Victron you had seemed well suited (100V entered into 15A, 12V 24V or battery) provided to connect the panels in series.
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Re: Choosing a MPPT regulator




by dede2002 » 29/05/18, 06:37

Hello,

The panels are in series or in parallel does not change much for the regulator in this case, in 12 V amperage will 32A which is too much for a 15A regulator. It is 15 A max side panels and also battery side.

Even in 24 V we exceed 15A.
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Re: Choosing a MPPT regulator




by izentrop » 29/05/18, 07:18

Hello,
The specifications read "Maximum PV power, 24V 1a, b) 400 W", the limitation is given on the PV side.
Battery side, the regulation prevents to exceed the 15 A, no? https://solaireshop.fr/media/amfile/fil ... 100-15.pdf

What about the EPEVER brand, MPPT regulators are significantly cheaper? https://solaireshop.fr/media/amfile/fil ... psolar.pdf
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Gaston
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Re: Choosing a MPPT regulator




by Gaston » 29/05/18, 08:50

dede2002 wrote:Whether the panels are in series or in parallel does not change much for the regulator in this case
[...]
Even in 24 V we exceed 15A.
But in 48V, it's good (there are two 24V panels that are serial).
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Re: Choosing a MPPT regulator




by ENERC » 29/05/18, 19:54

Just a clarification: if the power needed to charge the batteries is less than the power provided by the panels, the voltage will rise to the uoc.

In the worst case, ie charged battery, cold and sunlight, the voltage in series will once 2V 33.3 20% more because of the cold nearly 80V.
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Re: Choosing a MPPT regulator




by dede2002 » 30/05/18, 09:55

izentrop wrote:Hello,
...
Battery side, the regulation prevents to exceed the 15 A, no? https://solaireshop.fr/media/amfile/fil ... 100-15.pdf
...


Hello :) ,

Yes the regulator is protected by a current limiter, but we are outside the intended range of use, and we do not use all the power of the panels.

It's like driving on the highway in the second, the engine is protected by a speed limiter so it will hold ...

But I do not know if that's why the regulator burned?
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Re: Choosing a MPPT regulator




by izentrop » 30/05/18, 21:19

Landry.g did not come back to confirm, but he had to connect his panels in parallel to crame the regulator which had to be in overload in input.

Serial is no risk, but on the other hand, if it remains with a battery 12 V, it exploits only half power.
The solution would be the serial and battery assembly of 24 V.
ENERC wrote:In the worst case, ie battery charged, cold weather and full sun, the voltage in series will be 2 times 33.3V plus 20% because of the cold is near 80V.
No problem, so : Mrgreen:
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Re: Choosing a MPPT regulator




by Gaston » 31/05/18, 12:05

izentrop wrote:Serial is no risk, but on the other hand, if it remains with a battery 12 V, it exploits only half power.
Why is that :?:

It seems to me that this Victron regulator is well designed for this case where the voltage of the panels is higher than that of the battery.
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Re: Choosing a MPPT regulator




by izentrop » 31/05/18, 13:06

Gaston wrote:
izentrop wrote:Serial is no risk, but on the other hand, if it remains with a battery 12 V, it exploits only half power.
Why is that :?:
15 X 13 = 195 W for 420 W max of PV.
The battery voltage rises to 14 V at the end of charging, but the current is no longer 15 A at this time.
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