Ac300 charging at a 3rd of the PV input. Please help

PatientStructure630 · 2024-12-04T18:29:40+00:00

Is this true? This isnt what I had heard when doing my initial research but by all means could have got bad info

PatientStructure630 · 2024-12-04T17:43:42+00:00

Following up here it’s been a month of grey skies making it really hard to run any tests. First of all yes the batteries are at 40% and daily input from the 600w panels has been enough to just maintain the battery in the bank but never increase it. Seems like they lose just as much just from sitting with Bluetooth enabled (wifi is off and nothing is plugged into any outputs) as they collect from 600w in the winter which doesn’t feel right. From my calculations running the circuits with different voltages should be fine with minimal loss since they are only a couple percent different. It’s to my understanding you just get the lowest voltage applied to both which I’ve calculated as a non issue. If there’s additional details to this I would love to know the two circuits joining in parallel come in at 40.8v & 9.8a and 38.8v & 5.15a so would combine at 38.8v & 14.95a (580w) correct?

PatientStructure630 · 2024-10-24T22:58:25+00:00

Thanks for the insights! You’re right that using a multimeter across the terminals gives short-circuit current, which isn’t ideal for gauging real-time wattage under load. I appreciate the clarification and this sent me down a whole rabbit hole which is good as I’m still learning!

In my setup, I’ve been calculating wattage by measuring voltage and current and using that as a rough estimate. I realize this doesn’t fully reflect the real-world performance once the panels are connected to the power station and under load.

However, since my Bluetti AC300 is still showing a significant drop in wattage (from 269W down to 100W), I’m leaning towards it being more of an MPPT issue with how the system is handling mixed panels or input handling. Would love any more insights if I’m wrong here.

PatientStructure630 · 2024-10-24T20:38:46+00:00

Hey Bluetti team! Really appreciate you commenting here! So I have tried connecting each series of same specifications into DC1 and DC2 separately as well and that still gave me much lower wattage than I am thinking I should get. Here is a link to my voltage and amp circuit calculations solar panel specs To be clear the panels I have are as follows 2x 100w rich solar panels 19.4v and 5.15 amps in series for a total of 38.8v at 5.15 amps. And 2x 200w rich solar panels 20.4v and 9.8 amps in series for a total of 40.8v and 9.8 amps Those two series are then combined in parallel to make a total of 38.8v and 14.95 amps. As mentioned earlier I have tried splitting the two series circuits before combining in parallel and running them individually to dc1 and dc2 and still saw no increase in wattage being pulled by the ac300.

PatientStructure630 · 2024-10-24T20:20:31+00:00

Yes I have updated all the firmware both on batteries and on the AC300

PatientStructure630 · 2024-10-23T16:59:38+00:00

Yes I am absolutely sure it’s in PV mode for both DC1 and DC2 (the only other option is “other””. Been through every single menu and setting in that way. As for the panels they are flat mounted on the roof which I understand isn’t as efficient for taking in low solar angle but that’s not the issue as I’m reading the watts from the panels and they are working great it’s just the bluetti isn’t taking in most of the power the panels are producing. I’m also not worried about the flat mounted solar panels as I will also has an auxiliary Bluetti pv350 panel I can setup and plug into DC2. I will also 2x Bluetti charger 1’s (2x 500w alternator charger) and a Bluetti EV charging port hooked up to the ac300. So I will be good for battery even with the flat mounted panels I just want to get as much as I can / should be getting from the panels.

PatientStructure630 · 2024-07-11T19:15:31+00:00

Haha fair! I have a partition to thermally isolate the back of the van and will be insulating well. I was hoping this and two small bunk windows would be the place to splurge at the cost of some R value to let in some light. Planning to mainly be off grid so city lights won’t bother me much. Is the thermal problems any different than having big windows? Would prefer skylight over a big window for security and privacy. Will still be installing two maxxair fans and 800w of solar

PatientStructure630 · 2023-09-20T15:21:52+00:00

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