Not getting enough PV

[LittleLebowski]

I'm using 4 panels of Risen 335w panels in parallel that have a VOC of 45.9v and am connecting these to an Ecoflow Delta Pro. I've moved them twice on my property, no matter where they have been at, I top out at around 550 to maybe 600w on during good sunlight hours. Is it safe to try say three of these panels in series in order to possibly get more PV ouput?

 

[SamDeleted]

I'm using 4 panels of Risen 335w panels in parallel that have a VOC of 45.9v and am connecting these to an Ecoflow Delta Pro. I've moved them twice on my property, no matter where they have been at, I top out at around 550 to maybe 600w on during good sunlight hours. Is it safe to try say three of these panels in series in order to possibly get more PV ouput?

Series or parallel, in full sun they will make the same amount of watts


Are they dirty ?

How full are your batteries? If they are full , or at least close , your batteries could be throttling the panels output


The panels can't make power if there's nowhere for the power to go !

 

[Steve Fractals]

If the Ecoflow can take the voltage then try all 4 in series, if not the 2S2P. Are your angles good and panels without shadow areas? Also if the battery is full and not taking any loads then it will throttle down as will only take what it can. Try it with some decent loads on it whilst daytime and see if panels produce more etc.

 

[LittleLebowski]

My batteries are not full, panels are not dirty. No shade.

 

[Mattb4]

Sounds like your EcoFlow is limiting PV input. Not knowing it's specs I can not say if this is normal behavior.

 

[rodrick]

Max voltage is 150 and max amps is 15 on the scc according to their website

 

[LittleLebowski]

Sounds like your EcoFlow is limiting PV input. Not knowing it's specs I can not say if this is normal behavior.

I've got two and they're showing the same behavior. They are rated for up to 1600w of PV input on paper.

 

[SamDeleted]

I've got two and they're showing the same behavior. They are rated for up to 1600w of PV input on paper.

Do you know the max solar input amps ?

Not the battery charging amps


Rodrick says it 15amp .

 

[Mattb4]

Sorry I should have read your OP more closely. If the panels are in parallel your voltage may be below the minimum for your Ecoflow. Try Steve Fractals suggestion.

 

[LittleLebowski]

Do you know the max solar input amps ?

Not the battery charging amps


Rodrick says it 15amp .

This is all I can find from the Ecoflow site.

Solar Charging Input

1600W Max, 11-150V, 15A Max

 

[SamDeleted]

This is all I can find from the Ecoflow site.

Good that is exactly what I was looking for. Max solar input 15amp

And now, what amps do your panels run at ? I guess about 8amps

 

[SamDeleted]

And now, what amps do your panels run at ? I guess about 8amps

Isc / Imp on the label

 

[sunshine_eggo]

Series Voc of the panels must be less than 150V.
Parallel input from the panels will be max 15A. If you put more than that in parallel, it will only use 15A.

Panels are likely 11A, so 4P means you're wasting almost 3 full panels. Not a good choice.

Best option is 2S2P

That should get you about 80Vmp * 15A = 1200W MAX.

 

[LittleLebowski]

Isc / Imp on the label

• Imp 8.9A
• Vmp 37.65V
• Isc 9.4A

 

[SamDeleted]

Brilliant, so if they were all in parallel, you were offering the ecoflo 36amps, 21 above it's max

So no wonder you were seeing less than half the expected power !


Problem solved I hope

2s2p

 

[sunshine_eggo]

I misread the panel wattage, so my 11A was off.

You should be able to get 37.7V * 2 * 15A = 1,131W absolute maximum from those panels.

When in 4P, max should have been around 37.7V * 15A = 565W.

However, a little more is possible because the 4P array could deliver 15A at a voltage higher than Vmp, so 600-ish is certainly possible.

 

[LittleLebowski]

I misread the panel wattage, so my 11A was off.

You should be able to get 37.7V * 2 * 15A = 1,131W absolute maximum from those panels.

When in 4P, max should have been around 37.7V * 15A = 565W.

However, a little more is possible because the 4P array could deliver 15A at a voltage higher than Vmp, so 600-ish is certainly possible.

You're still recommending 2S2P, right?

 

[SamDeleted]

I misread the panel wattage, so my 11A was off.

You should be able to get 37.7V * 2 * 15A = 1,131W absolute maximum from those panels.

When in 4P, max should have been around 37.7V * 15A = 565W.

However, a little more is possible because the 4P array could deliver 15A at a voltage higher than Vmp, so 600-ish is certainly possible.

Op said 550w to 600w , so you're spot on

 

[SamDeleted]

You're still recommending 2S2P, right?

Yes should be good , try it and get back to us

 

[sunshine_eggo]

You're still recommending 2S2P, right?

Yep... just correcting my error.