I love Bluetti and have both Apex and Elite products.
But I really wish they would up the input voltage to higher that 60 volts.
150 volts would be perfect.
The SolarX 4k is too big for a portable device.
Why have they limited most production to 60 volts?
Charging input Wattage is relevant to battery capacity size. Watts is a result of Volts x Amps.
In a smaller power station amperage is also limited by cable size and connector rating i.e. the AC70 has a connector and cable rated to 10A as well as the internal wiring. It is also rated to a 500W maximum charge, even though 10A x 60V = 600W. As we all know, solar input rarely if ever achieves maximum output, but overpanelling is ok providing rated voltage is not exceeded.
To use 150V as an input voltage for a rated 500W charge, the current would need to be limited to 3A. Try finding a solar panel with those specifications.
Although power stations do have AC fast charging greater than 1C, constant fast charging is not good for a battery’s cycle life. The “sweet spot” for LFP charging is much lower than 1C. I have a 100Ah LFP deep cycle battery, charged by a Victron 15A Bluesmart AC charger, this is 0.15C. It is 8-9 years old and still delivers 97+Ah.
This is why I charge all my power stations (AC2A, AC70, AC180, Elite 100) in Silent mode where ever possible. Standard mode is used occasionally and Turbo Mode very rarely used. The same logic applies to Solar charging.