800 Watt Array (4) Series 200 Watt Voc 36.4V Vmp 31.7V

[bob58o]

Trying to plan out a 48V 800 Watt PV Panel system using (4) 200 Watt BougeRV 16BB N-Type (High Voltage) panels. Working with area about 60” x 120” for panels.

Voc x 4 = 36.4V x 4 = 145V
Vmp x 4 = 31.7V x 4 = 127V

For each panel…
Isc = 6.6A
Imp = 6.3A

Was thinking about All in One EG4 3000EHV-48…
Will the Input voltage from the array be sufficient?
The max power voltage reported for each panel says +/- 5%

I’m aware the idle power consumption is high for an 800 Watt array, but thinking about the ability to expand the array in the future.

Or if staying with a smaller system with lower idle power consumption….

Could I use a Victron MPPT 150/35 charge controller with Victron 48/1200 Inverter?

Other options to look at?

 

[Mattb4]

Trying to plan out a 48V 800 Watt PV Panel system using (4) 200 Watt BougeRV 16BB N-Type (High Voltage) panels. Working with area about 60” x 120” for panels.

Voc x 4 = 36.4V x 4 = 145V
Vmp x 4 = 31.7V x 4 = 127V

For each panel…
Isc = 6.6A
Imp = 6.3A

Was thinking about All in One EG4 3000EHV-48…
Will the Input voltage from the array be sufficient?
The max power voltage reported for each panel says +/- 5%

I’m aware the idle power consumption is high for an 800 Watt array, but thinking about the ability to expand the array in the future.

Or if staying with a smaller system with lower idle power consumption….

Could I use a Victron MPPT 150/35 charge controller with Victron 48/1200 Inverter?

Other options to look at?

The PV specs for the EG4 seems to be 120V to 450V. I do not know if there is a higher startup amount needed than the minimum. With panels Vmp being 127vDC it would look to be enough however you might find it would work better with the PV voltage being higher.

Idle power is likely around 50W from the EG4 and over a day that is 1200Wh. Or about 1.5 hours out of your average days production.

The Victron 150V/35A is pretty close to the panels Voc of 145V. Cold weather might destroy the Victron.

 

[Rocketman]

With the Victron option, you will need to put the panels in 2s2p - to bring the Voc down to a level that a cold day will not destroy the SCC (as temps fall the voltage rises).

That will work very well and be very efficient.

Good Luck with whichever path you choose.

 

[bob58o]

The PV specs for the EG4 seems to be 120V to 450V. I do not know if there is a higher startup amount needed than the minimum. With panels Vmp being 127vDC it would look to be enough however you might find it would work better with the PV voltage being higher.

Idle power is likely around 50W from the EG4 and over a day that is 1200Wh. Or about 1.5 hours out of your average days production.

The Victron 150V/35A is pretty close to the panels Voc of 145V. Cold weather might destroy the Victron.

I started looking into 24V all in one systems but it seems like many of those are 145V max input.

Maybe I can do those panels is 2s2p ???
73V 13 Amp array output?
Would that work with a Victron 100/50 charge controller?

 

[bob58o]

With the Victron option, you will need to put the panels in 2s2p - to bring the Voc down to a level that a cold day will not destroy the SCC (as temps fall the voltage rises).

That will work very well and be very efficient.

Good Luck with whichever path you choose.

I was typing as you were… would those in 2s2p work with the 100/50 option? 100/30 might be too small? If doing a 24V battery?

 

[bob58o]

So I could do…

48V 100AH Battery

(4) 200W BougeRV 16BB N-Type Bifacial High Voltage arranged in 2s2p

Victron 150/35 Charge Controller

Victron 48/1200 Inverter

$850 for the Solar Panels
$330 for the inverter
$170 for charge controller
$650 - $1150 for battery

$2000 - $2500 for Basic 48V System

800W PV Array
5.1 kWh Battery
0.85 kW - 1 kW inverter continuous output
2.2 kW surge output


Maybe 2.5-3 kW Solar charging per day?
Not sure what real world conditions produce.

 

[Mattb4]

I started looking into 24V all in one systems but it seems like many of those are 145V max input.

Maybe I can do those panels is 2s2p ???
73V 13 Amp array output?
Would that work with a Victron 100/50 charge controller?

There are several 24vDC AIO's that have higher PV Voc ratings. Of the ones I am presently running 1 is 120v to 450v with 150v startup. Another is 60v to 450v

2S2P would work for the Victron. With 50A charge you would only max out when you reached 1250W worth of panels. So you could add another string to end up with 2S3P (1200W) or perhaps 2S4P (1600W) is you want to overpanel it.

 

[bob58o]

It’s cool there are so many options these days.
I’d like a very efficient inverter for 2 small chest freezers (one converted to fridge).

I think the Victron 1200VA inverter would work for 2 of these. I’m guessing they each use about 0.375 - 0.500 kWh per day. Probably only a couple hundred watts when running. Hopefully the 1200 VA has a surge capacity to handle two mini chest freezer compressor start up’s.

 

[bob58o]

There are several 24vDC AIO's that have higher PV Voc ratings. Of the ones I am presently running 1 is 120v to 450v with 150v startup. Another is 60v to 450v

2S2P would work for the Victron. With 50A charge you would only max out when you reached 1250W worth of panels. So you could add another string to end up with 2S3P (1200W) or perhaps 2S4P (1600W) is you want to overpanel it.

Which one is 60V to 450V?

I was looking at Li Time 24V AOI but thinking about the 2s2p array for about 77 Voc. The ideal range for the Li Time says 30-105V.

I’d like an input range of < 120V min and over 150V max to run 4 of those panels in series if possible.

 

[Mattb4]

You can read about the Sumry* I am running but there is several others that market it under their brand. Such as the PowMr, Y&H and Sungold . BTW there is a special on the Sumry as mentioned in my last post of the Sumry review.

*https://diysolarforum.com/threads/s...boxing-updated-with-operational-review.88331/

SUMRY 3600W 110V Solar Hybird Inverter On/Off Grid 24V Solar MPPT Pure Sine Wave | eBay

7 MPPT: max 6200W(for 3.6KW). 1 Pure sine wave solar inverter (on/off Grid). 3 Inverter running without battery. 11 Dual output.

www.ebay.com

 

[bob58o]

Are there any other things, besides Solar Charger Voltage and Wattage rating, I should take into account before choosing a 4s vs 2s2p array?

I understand higher voltage systems are usually more efficient.

Since these 16BB bifacial panels are already “shade tolerant” would 4s array be more efficient than 2s2p even in partial shade.

Or would a 2s2p array have the advantage if in partial shade?

 

[Mattb4]

Minimize shading if you can as it will drastically cut your panels production. For instance one of my arrays is setup as 8S2P (100W panels) due to the way the sun comes up and illuminates some panels earlier than others. This is thanks to my location on a wooded hillside. So I get production from the first string of 8 although the second string of 8 is in deep shadow.