Hello everyone,
does anyone may know why my bluetti “only” charges with 450W on each tracker ?
i mean it should support up to 2400W and my 4 panels should be able to get to 505W but my AC300 shows no more than 450W on the screen.
is there something i need to do, to get it to charge at full capacity ?
My system got these Panels
PV-Modul 505W JA-Solar JAM66S30 /MR Black Frame
Modultype JAM66S30-505/MR
Pmax 505 W
Vmp 38,53 V
The Wattage shown on any Bluetti power station as an input, in your instance solar, is what it is receiving. Without a Watt meter inline and between the solar panel/s and the AC300, one can only assume that is what your panels are producing.
The primary thing to understand is and I will give my home roof top solar panels as an example;
My panel array is 6.6W, made up of 15 panels each rated at 440W = 6,600W. They are east/west and split either side of the roof and since installation have never produced more that 5kW due to their orientation. The inverter is 5kW and therefore getting it’s maximum input/output.
However, here in Australia, the above 5kW output is in summer time and it’s currently winter, so I am seeing output drop to 1.5kW (less than 25%) on overcast days. More…
With a 505W rated panel (that is a laboratory tested figure at 25 deg C (77F), you will rarely if ever get that output in the real world. Angle of elevation, orientation at different times of the day, ambient temperature, panel temperature, cloud etc all affect output. That you are getting 90% of rated output, is not something I would complain about, even as a maximum production.
Other things such as quality of panel, length of cable relative to voltage drop also lower output. without actually putting a power meter as mentioned above, when the panel is connected and under load to the AC300, the panels actual output is not known.
In my opinion, the AC300 is not the issue, as much as, what the panel is producing.
I see, i was just wondering because my other setup with the same orientation but smaller panels, pmax and a limited inverter (800W) reach the limit easy even on not so hot days and the bigger ones, with no shadow were capped at 450 …
So my best option would be to get someone, to measure the connections and panels to see if there is a problem somewhere and if not, i would have to accept the rates i get.
Other setup
4x Grand Sunergy PV-Modul Grand Sunergy GSM-MH4/108-BHDG 440
Pmax 440
Vmp 34.04
Hoymiles microinverter HMS-800W-2T
With DC circuits, whether a battery providing power to a load, or something like a solar panel charging that battery, the following usually occurs.
The higher the load, the longer the cable run and the smaller the wire gauge - the more the voltage drops. I’m talking low voltage 12-24V systems. This affects efficiency and in some instances, a load device will not work.
A good example is when we used to use AGM batteries, once they get to 50% charge and with a load of a 12V TV, some lights and maybe other loads like a RV water pump, the load can be around 10A. This is enough to lower the battery voltage below 12V and many TVs will shutdown. The same applies with solar input, if the output is below a charge trigger voltage, the charge controller won’t work.
LFP batteries have increased output voltage to 13.1 to 13.6V for most of their capacity and as with Bluetti power banks allowed nominal 24V solar charging with a Voc output in the mid 40V range.
I would say that in simple terms, “If you are solar charging a small power station, with a small inbuilt MPPT solar controller, your output will be greater than if you use the same panel to charge a much larger battery, with a larger MPPT controller.” Think of it as effort, lifting a 5kg (11lb) jerry can takes less effort than lifting a 20kg jerry can.
In real terms your 450W input is less than 20% of what the AC300 is capable of accepting. My bottom line is; some charge is better than no charge. 
As the Voc of the AC300 is 150V max, connecting 2 panels in Series at 38.53Voc will up that voltage to around 77V, 3 panels in Series to around 115V and all within the limit. This will double or triple solar charge rates.
Four panels in Series exceeds the 150V max, so not something I would do as this would damage the power station.
So if i read that right on the Dealer page, up to 150V and 1200 on each tracker.
My panels got 38.53V times 2 since i connected 2 panels on each tracker, which means to each tracker is a connection of 77.06Vmp.
It supports up to 1200W on each tracker and my panels sum up to 1010W.
So i should be well within the recommended range.
Please correct me if my stats are wrong here.
Forgot to mention, the wires are less than 10m from the Y-adapter to the connector on the station
