Hi all,

 

Im trying to make an informed decision on my panel choices before making a purchase,

 

The setup i want

10 panels

5kw sunsynk inverter

2 X 5kwh sunsync bats

 

Most guys are quoting me  on the JA 550W panels

 

Now here my question

The rating on the inverter for PV current is 13 amp

The panels the guys are quoting me on are MAX CURRENT AMP 13,1 -14 around there

 

Will the panels ever reach that? Because im worried that i might hurt the inverter in the long run?

Do the panels produce less current over time?

 

Please advise 

Thanks

Or am i being silly to worry about being .11 over current for inverter? 

 

Minor excess Amps won't hurt the inverter as it will simply clip the excess. Excess Volts will hurt your inverter though, so make sure you connect it as 2 strings of 5 panels instead of 1 string of 10. Voc of 49.9V times 10 is way too close to 500V.

I think current will be clipped, your main consideration should be number of panels and string size (i.e. I assume you're not intending to put all of those onto one string as that would not work with sufficient safety margin). Also, you don't want too few panels on a string and be too far off the sweet spot or even below the minimum. What is your plan with string size and direction? 2 strings with 5 panels each?

Hi yeah going to be two stings 5 and 5

That is good, I cant wait have like 20 quotes on my table.

Some dont want to do the 550w panels other say it shouldn't be a problem.

 

But its the same price and more power if i go with 550W so i dont think why i wouldn't right?

As long as the Clipping by 0.2 amps or so wont damage the inverter im going with that option

 

Thanks for the advice

On 2023/05/25 at 3:01 PM, p_i said:

Minor excess Amps won't hurt the inverter as it will simply clip the excess. Excess Volts will hurt your inverter though, so make sure you connect it as 2 strings of 5 panels instead of 1 string of 10. Voc of 49.9V times 10 is way too close to 500V.

What is considered "minor" though?

I'm assuming the panels that @VinceG is talking about is the JAM72D30-550 which has STC values of Imp-13.11 and Isc-14, but then the spec sheet shows the values go up all the way to 14.98 for Isc? So will the inverter clip a full amp or 2 if presented with those conditions?

 

 

 

Edited May 29, 20233 yr by Zombie

I believe it will be fine (and I hope I'm not wrong, or I might have an issue with my future 500w panels). Note the last line in this snapshot from the 5kw manual:

ok, then you should be good.

I still wonder how much amps is "too much" and becomes unclippable.

Here's another thread about the same topic:

 

14 minutes ago, Zombie said:

I still wonder how much amps is "too much" and becomes unclippable.

From the spec sheet - 17A

Hi all,

My amp is 22.9 and my inverter mppt is set for 18. I am 5 over. Will my mppt clip the 5 above the set 18 amp. Or am I in danger here. 

How much can you over-panel a 8kW Sunsynk?
Currently I have 12 x 545W panels, 6 on each MPPT. These panels are all facing North-East. I would like to add more panels on my North-West facing roof.
Today (I know it is almost the shortest day of the year) my maximums were 250V and 9.5A on each of the MPPTs

If I parallel my two existing strings into one MPPT, I suspect I will get close to or maybe exceed 26A in the summer.

Up to what point will the inverter clip an over current?