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Posted

Hi

 

What will be the best option for me to compensate for cloudy days

 

I have the following:

Kodak Solar Off Grid Inverter OG-Plus 5.48RM

4x Jinko 470w (JKM470M-7RL3-V)

I have 2x panels in series and then the 2x series in parallel giving me +- 80-90v (inverter MPPT only support up to 115v so if I add 3x in series voltage will be too high)

 

I was thinking of adding another 6x 470w panels but that will give me max output of 5640w and inverter only support max of 4000w

 

so if its full sun day and I get max out of the panels will the inverter overload or will it only use 4000w and discard the rest ?

Posted
1 hour ago, Otter said:

I was thinking of adding another 6x 470w panels but that will give me max output of 5640w and inverter only support max of 4000w

Err, you have 4 now, after adding 6, that would be 10, and 10 x 470 = 4700 W.

Your model will output a maximum of 4000 W or so (80 A x battery voltage). It's generally considered that 20% "overclocking" is acceptable; the inverters' poor control algorithm won't go too crazy with that extra "twitchiness" of the control that extra high power panels causes. So that's a max of 5000 W, and 4700 W is comfortably below that limit.

I would not add another 8 for a total of twelve however; in full sun, the overshoots could damage your battery or inverter.

Apart from the overshoots, yes, the solar charge controller will "discard" (just not make use of) the extra available power in sunny conditions.

Posted
7 minutes ago, Coulomb said:

Err, you have 4 now, after adding 6, that would be 10, and 10 x 470 = 4700 W.

haha yes apologies, I ment add 8 and have 12 in total

 

8 minutes ago, Coulomb said:

I would not add another 8 for a total of twelve however; in full sun, the overshoots could damage your battery or inverter.

ok thanks, then ill stick with 10x in total for now untill I replace the inverter one day

 

thanks for advice

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