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One 400W solar panel to 2 power stations?

Kbeam

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Joined
Jun 17, 2024
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7
Location
Belgium
Hello everyone. The last topic that I posted I was amazed at the great info that I got!
So now I come with another question.
Please bear with me, I'm new to this.
A friend of mine would up with 2 portable power stations, 300W max output, 288Wh capacity and 12-24V/5A solar input (male XT60).
https://v-tac.eu/solar-pv-systems/p...-portable-power-station-eu-socket-detail.html
I am looking for a suitable solar panel for the duo.
The panel that I saw was this one:
Pmax – 410Wp
Vmp – 31.46V
Imp – 13.04A
Voc – 37.45 (± 3%)
Isc - 13.85A (± 3%)
https://v-tac.eu/solar-pv-systems/s...solar-panel-1722-1134-35mm-31-pcs-detail.html
I am thinking probably the most straightforward solution would be a parallel Y 1 male to 2 female XT60 splitter like this one:
Dilwe Parallel Adapter Cable, XT60 Parallel Battery Connector Adapter 14AWG Cable for RC Lipo (1 Male to 2 Female) https://amzn.eu/d/0ctNdUTh
I am seeing a bit of a risk there as Vmp is 6V higher than the Power Station's Solar DC input.
I imagine that this input voltage is not reached very often, but it's also not a huge excess, even if it happens to reach that voltage.
The Imp is also 3A higher than the combined rating of the 2 power stations. I understand that the parallel splitter will split the current, max 13A and bring maximum current of 6.5A to the XT60 solar input of each power station.
I imagine that also this input current will not be reached too often and that it's anyway also not a huge excess.
That being said, if a MPPT or a PWM could be better installed between the 400W panel and the XT60 splitter to bring those voltages and currents down when needed, I think it would be best.
However, I see that none of those have any MC4 or XT60 input/put.
I also don't know how those would recognise the 2 power banks connected in parallel, so any advise on that would be greatly appreciated!
Thanks again to all!
 
If you connect one panel to two different MPPT, you will never get optimum charging from the panel. The two MPPT will "fight" over it as the operation of one MPPT will interfere with the other, and they'll both just continually sweep through a voltage range never finding the optimal power point.

If you only have one panel for two power stations, connect to only one at a time. You will get far superior results.
 
My idea was 1 MPPT before the splitter.
But I get that the MPPT might get confused.
Would then the "dumb" PWM not work better?
The point is that the guy already has 2 Power Stations. And they can only get charged at 24V x 5A. So, charging at half-rate is gonna be sub-optimal.
But also, would it not work without MPPT/PWM? Those Power Stations already have such built-in, right?
 
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