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High voltage solar panel (60-70Vmp)

yabert

yabert

Solar Enthusiast
Joined
Nov 23, 2020
Messages
703
Location
Québec, Canada
Hi

I'm looking to charge a 16S LFP battery on a sailboat.
As shade can be important, I would like to have four 400-500W panel in parallel to one or two Victron MPPT.
The ideal situation is to have each of the solar panel with an output Vmp around 60-65V.
I only find 54 cells panel (around 31Vmp) or 66 cells (around 35Vmp) or 72 cells (around 41Vmp).
Is there 110-120 cells solar panels with a Vmp around 60-65V?
Thanks
 
yabert said:
Hi

I'm looking to charge a 16S LFP battery on a sailboat.
As shade can be important, I would like to have four 400-500W panel in parallel to one or two Victron MPPT.
The ideal situation is to have each of the solar panel with an output Vmp around 60-65V.
I only find 54 cells panel (around 31Vmp) or 66 cells (around 35Vmp) or 72 cells (around 41Vmp).
Is there 110-120 cells solar panels with a Vmp around 60-65V?
Thanks
Click to expand...

There are some 96 cell panels out there. Vmp @ 60.

Panasonic HIT VBHN340SA17 340Watt 96 Cells BoW Monocrystalline 40mm Black Frame Solar Panel

Shop Panasonic HIT VBHN340SA17 340Watt 96 Cells BoW Monocrystalline 40mm Black Frame Solar Panel online or call us, Solarflexion, at 800-942-2424 for your solar needs.
www.solarflexion.com
 
yabert said:
Hi

I'm looking to charge a 16S LFP battery on a sailboat.
As shade can be important, I would like to have four 400-500W panel in parallel to one or two Victron MPPT.
The ideal situation is to have each of the solar panel with an output Vmp around 60-65V.
I only find 54 cells panel (around 31Vmp) or 66 cells (around 35Vmp) or 72 cells (around 41Vmp).
Is there 110-120 cells solar panels with a Vmp around 60-65V?
Thanks
Click to expand...
High voc panels tend to be Japanese from my research, I've seen a fair few solar frontier panels in the Thai market that have around 77voc.
 
Something like 3 smaller 100-130w panels in series will get you higher voltage in the same footprint as one of the larger ones. Easier to find and ship.

My neighbor has some of these and they do pretty good, but im not sure they are still around.
20240523_120836.jpg
 
I am with Seneysolar on this. Buy smaller wattage panels that the total covered area is the same* and wire them in series and parallel to get your voltage. They will cost a bit more per watt than the large panels.

22% efficient panels will give you 220 watts per square meter. Some area loss for the additional frames for several small panels versus 1 large.
 
littleharbor2 said:
What ending voltage are you trying to come up with?
Click to expand...
I wrote 60-65V at two places in my first post.

Thanks for the input all.
It look like my best plan is actually to stick with 56-66 cells solar panel and I will have to connect two in series to reach voltage over 60V.
I hope the split cell design will help with all the shade encounter on a sailboat.
 
yabert said:
I wrote 60-65V at two places in my first post.

Thanks for the input all.
It look like my best plan is actually to stick with 56-66 cells solar panel and I will have to connect two in series to reach voltage over 60V.
I hope the split cell design will help with all the shade encounter on a sailboat.
Click to expand...
You could look at optimizers for the shade but it's just another failure point and I guess the less of those on a trip the better.
 
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