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Charging different solar generators from one larger solar array?

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Curb71

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Sep 29, 2019
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Is there a way to dial back the voltage on a larger solar array to charge a smaller solar generator?
I want to max out an array for the Bluetti AC200 but then I can't charge any smaller solar generators like the R600 or Delta from it?
Voltage regulator? Buck converter? Is this possible?
 
Power the AC chargers for the other units from the AC200 while it's charging/charged?

design your array to where it can be easily broken down into smaller pieces.

There are DC-DC converters that can take a wide range of higher voltage and convert to lower voltage, which might be suitable for an MPPT in the smaller units.
 
snoobler said:
Power the AC chargers for the other units from the AC200 while it's charging/charged?

design your array to where it can be easily broken down into smaller pieces.

There are DC-DC converters that can take a wide range of higher voltage and convert to lower voltage, which might be suitable for an MPPT in the smaller units.
Click to expand...
I definitely don't want to dedicate the AC200 to be a slave for just charging other solar generators. There's also conversion losses here.

Is it possible to mount panels on a roof and then run all the cables down low to change configurations all the time?

I guess I'll look into these DC-DC converters. Thanks.
 
Curb71 said:
  1. I definitely don't want to dedicate the AC200 to be a slave for just charging other solar generators. There's also conversion losses here.
  2. Is it possible to mount panels on a roof and then run all the cables down low to change configurations all the time?
Click to expand...

1. understood. It's an option. If the power is free, the conversion losses don't matter that much.
2. Definitely. You could run each pair of conductors down to the "solar charging station" where you would then combine the panels as you like.
 
snoobler said:
1. understood. It's an option. If the power is free, the conversion losses don't matter that much.
2. Definitely. You could run each pair of conductors down to the "solar charging station" where you would then combine the panels as you like.
Click to expand...
Conductors? As in the MC4 connections?
 
Some would probably agree that 10 is too many. Lol
If I put six 180W BougeRV panels on a roof, I have 12 cables running down to mess with each time I want to charge something different. That seems less practical than sacrificing the AC200 to live under the roof and just be a charge slave for the smaller generators. That also sounds ridiculous now that I typed it out.
I was hoping there was some type of voltage regulator like Will P has, with a dial to adjust the volts and/or amps. Maybe that's what I assumed that device was but it's something else.
 
Yeah, it's a CC/CV power supply.

What's your Voc/Vmp on the array coming in to the AC200?
 
snoobler said:
Yeah, it's a CC/CV power supply.

What's your Voc/Vmp on the array coming in to the AC200?
Click to expand...
I was planning on buying these new panels for this project. I'd be able to wire 6 in series for the AC200. 3 in series for the Delta. I guess only 1 panel for the R600. So ideally, if I could wire the 6 in series and then dial back the voltage for the smaller generators, then it would be perfect for everything. But even if I did only 3 panels I still wouldn't be able to charge the R600 from it.

Max. power voltage(Vmp): 18±5%
Max. power current(Imp): 10±5%
Open circuit voltage(Voc): 21.6±5%
Short circuit current(Isc): 10.5A
Series fuse rating: 15A
Max. system voltage: 1000V DC
J-Box IP Rating: IP65
 
I'm not willing to hunt down all the parameters for the 3 generators, but you're not stuck with series. You can also over-panel them if you follow the right parameters.

If you brought all six panel conductor pairs into your charging station, you could arrange them to your heart's content, but that's 12 wires coming in and a bit of a rat's nest to manage - you'd need everything labeled and a well-thought out connection chart for reference.

That would also allow you the option of charging multiple units at once - 2S on the AC200, 2S on the delta and 1-2P on the R600 - charging all three at once.
 
snoobler said:
I'm not willing to hunt down all the parameters for the 3 generators, but you're not stuck with series. You can also over-panel them if you follow the right parameters.
Click to expand...
The R600 is 10-25VDC, 12A max, 200W max
The Delta is 10-65VDC, 10A max, 400W max
The AC200 is 35-150VDC, 12A max, 700W max
 
R600 would work with 2P
Delta 2S2P or 3SXP (it will ignore the extra amps)
AC200 whatever you want... ;)

Hmmm... 2S2P, bring that down as an array, 1 pair of wires for the whole thing as that can feed the Delta and the AC200.

bring down two panels individually. You can use 2P for the R600 and then go 3S2P for either the Delta or AC200.
 
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