Can I safely use these panels ?

outboard1196 said:

I think the answer is going to be no but I'm curious what other think.
I have a victron 150/70 sc at 12v maximum input watts is 1000 150v there's some bifacial 540w panels locally at a good price series or parallel I would safe on voltage with 2 panels but I would be over 1000w . being bifacial could they be used ? I would have them set on a rack @35* not vertical . If mounted vertical could they be safely used ?
Et solar
Et-m772bh540tw

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sunshine_eggo said:

Victron is very over-paneling tolerant.

1000W isn't an input limit. It's the maximum output of the charger because of the 70A limit at battery voltage.

You merely need to insure 150Voc is NEVER exceeded in any conditions and not exceed the PV INPUT current limit, which is 50A max.

Panels are: 49.6Voc, 13.86A Isc.

2S would be good to ensure you never exceed 150V.
50A/13.86A/panel (rounded down) = 3 panels in parallel, so...

You could put a 2S3P array of those panels on that controller safely. That's 3240W.

Of course, you'd never get more than about 1000W out of it, BUT you'd get that 1000W almost all day - for as long as a 3240W array will output 1000W.

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outboard1196 said:

Ah you are correct I just re-read the data sheet !
They are $165 each ...

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sunshine_eggo said:

cheap!

But those are HUGE and heavy.

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Hedges said:

Being bifacial, they can be used.
Being bifacial will only be a benefit if light hits the back. So 35 degrees and reflective groundcover is a possibility.

Vertical or horizontal or anything else can be used.
Just optimize for seasonal and time of day production, seeking to stay over 1000W as long as possible.

If 2s3p as Sunshine suggested, each 2s should be of a particular tilt & orientation, but the three pairs can each be different to level production.

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Hedges said:

Not 3s, that would be ~150V nominal, higher cold.

Did you mean 3p?

3p Would only be 40A if all facing same way.

Due East and Due West would perform badly in winter.
If a 3rd pair due South, would be much better.

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sunshine_eggo said:

Worth noting that the PV input current limit is only really a factor if you connect the array in reverse polarity. The contactor that shorts the PV terminals is limited to 50A. If you never hook it up backwards, the only limit is the one where you feel so silly putting such a huge array on a 70A controller.

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