This is all very disappointing. This problem needs to be resolved. I now have a a 20 panel ground mounted system and continue to add panels just to get enough power to recharge system during day. (Thank goodness for New Mexico sunshine 
). Manage to get output above 2.6kw but AC 300 still out performs considering I can put directly 2.4 kw into those units.
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I’ve adjusted the charging current to 75A in the Bluetti App but it doesn’t improve the output, still max 1450W per string (18x150W solar panels). I’m getting the same 1450W output or sometimes more with AC300 and 12x150W solar panels. I need 50% more solar panels with SolarX 4k to get the same output as the AC300. I hope it’s only a firmware thing.
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This is so disappointing… Bluetti are you reading this? Solarx needs some work!
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Sorry to ask but did you set the charging speed to Turbo in the Apex 300? That 1450W limit sounds like it could be set to Standard charging.
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You’re right, thank you!! Forgot to set on turbo. I’ll check it again tomorrow because here in Spain it’s already late afternoon.
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Turbo helps a little but still not 
production.
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Turbo does help a bit, but the production still isn’t at 100%. We’re getting some improvement, but it’s not fully where it needs to be yet.
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I’m getting now 3900W instead of 4200W. That’s ok for me. Less cable spaghetti with 2 SolarX 4k, 2 Strings instead of 6 strings with 2 AC300 and 2 AC200L Maybe a future firmware update will improve output.
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@Claus1 could you share what you are using as your solar array? I’m interested to see what combination works to get 3900w.
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I use 36 Enjoy Solar 150W panels ( enjoy solar® Panel Solar Monocristalino 150W 12V, PERC 9BB) in 2 strings (2x18x 150W), VOC 22.88V, ISC 8.77. I have bought a 3rd SolarX 4K and will set up another string with 18x200W, VOC 24.3V.
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That is a lot of panels! You must have a lot of space! Wow.
Thanks, that looks like about 411 VOC, which approaches the 500 VOC upper limit of the SolarX. My limited testing supports the hypothesis that you need lots of volts in order to be effective with the SolarX.
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Currently I have 24 panels! Producing about 400 volts (panel rating 220 watts). Producing a little over 3kw.
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So 24x220=5280 rated watts on the panels. If you’re getting direct sun, “a little over 3kw” is certainly poor. Which cable are you using? I have some better news from my side: Today I received the P090D cable and connected my 2 kw DC power supply producing 182v. The system was pulling about 1800 watts, which is way better than the ~1300 watts while using the parallel cable. If only we could control the SolarX output voltage while using the parallel cable, it should in theory be able to match the performance of the P090D cable.
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Thanks for the information. Panels south facing full sun. (New Mexico sun!) 10 gauge cable.
AC300 sitting right next to this system with only 8 identical panels produces 1400 watts!
Sorry, I meant to ask whether you are using the P090D or parallel cable when you are getting a little over 3kw from your 24 panels. I saw a pretty big difference between those two cables in my own very limited testing.
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Using currently parallel cable… tried PD90 cable and it did not improve much. Problem is I have 3 Apex 300 units running in parallel… installing 3 SolarX not a big fan of…
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I got 4700 watt from 5400 rated watt panels and 2 SolarX today.
Got a similar issue. Still haven’t figured out how to even get my Solar X to work! Long story, wish we had direct chat availability or email to each other. Any rate, yeh, seems after lots of “after the fact re-researching” when you have multiple Apex’s in parallel, you get the PV output cable with the 3 XT60’s, one for each Apex of course, and then the power is “divided by 3”, or in my case by 2, as I only have 2 Apex’s at this time. For now, I’ve circumvented the Solar X issue by setting up four individual cables with the XT60, one 580W panel x 2 XT60 ports per Apex, when they’re in full sun even in the fall with lower azmuth (plus 4 hours of tree shading) the Apex will be pumped in with almost a full 570W per PORT when the sun is “away from the trees lol”. Somehow right now I’m not sure the Solar X can even match that. I’m afraid I wasted my money. BTW, I actually have 6 of these 580W panels, however one is positined toward the SW due to a space issue, the other 5 directly South. So turns out I really can only daisy chain (series) the 5 panels, and I can live with that. The “goofy placed panel” I’m using for my battery backup sump pump anyway. So it’s all good. So now I’ll wait til next summer and try the Apex when I have a good 7 hours of really decent sunlight when the trees don’t bother the panels. Then maybe I can get close to the rated 2900 Watts from the 5 panels, perhaps at least 2500 Watts, but then the parallel cord x 3 XT plugs only say they’ll provide I think 1200 Watts input anyway. So I’ll lose at least 100 watts. Maybe I’ll just stick to the 4 individual cables, and mount them nice and professionally to the system like I DID with the Solar X cable system. I’m a stickler for neatness and professional installation. Sorry for the length. I’m big on info!
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Thanks for the post good information. Right now bright New Mexico sun and SolarX is producing right at 3k but that is with 24 x 220 panels! My hack now is your hack…. I use the Solarx 3 cables that go into one solar input port and have put 6 more panels in pairs of two into the open solar port. This gives me an extra 1k plus.
Super lame I have to do this. I bought the SolarX to handle everything and for whole home power and or back just does not cut it as a one unit solution.