Hello everyone!
I’m new to the community and would like to ask for your help to clarify a very basic question, to understand whether the calculations I’m doing make sense or not.
Equipment involved:
Desktop Computer: 60Wh of average consumption
PV120S: 75Wh of average generation
EB70S: Being charged by the PV120S and powering the Desktop Computer
(all data was read from the EB70S display)
Situation:
Considering a workday, between 9am and 6pm (with a 1h interval without consumption - 8h of use), with the sun providing, during this period, the 75Wh (oscillating between higher and lower values, but with this average most of the time), and an average consumption of 60Wh from the computer.
Using the average values, +75-60 = +15, what would be the estimated percentage on the EB70S at 6pm? 100%? 80%? Lower?
Is it possible that the EB70S is completely discharged, to the point of turning off the computer, at this time? Even with an estimated positive average balance of +15Wh?
If the calculation I am making is wrong, how can I adjust it to have a more assertive estimate?
Thank you in advance for your help!!
Hi @rodperrone
Welcome to the bluetti community forum!
You can calculate the estimatet run time with this:
Runtime = Batteriecapacity (Wh) x DoD x Inverter Effiency / (Load + Selfconsumption of the EB70S)
That would be something like this for EB70S:
716 x 90 x 90 / (60W + 12W) = ~8 Hours ----- That would be without solar panel
When the solarpanel deliever about 75W over 8 hours, you charge 600 Wh. So about 80% about what you consume is covered.
This calculation isnt on point, but it should give you a idea.
greetings
Erik
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Thanks Erik!!
Using your estimate, which makes sense to me, it is possible to say that ending the day with the battery completely discharged would be due to a problem with the EB70S’s charge, even if I see on the display the panel providing the energy needed for recharging, correct?
Perrone
The calculation is really roughly. There are other things like temperature and age of the batterie that also can effect the performance. Also, i assume that the solar panel have a constant power over hours which isnt true in most cases.
If you have much lower usage than expected, i would try to calibrate the SoC bei Discharge the unit to 0 (all outlets turn off) and recharge it via AC, this twice.
greetings
Erik
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Despite the rough calculation and the other variables that must be considered, the estimate of 80% of battery remaining at the end of the day, or, in the worst case scenario, putting it at 50% available, is far from what actually happened, with the battery completely discharged. It is as if there had simply been no charging through the solar panel during the entire day.
And my greatest discomfort, and the main reason I came to ask for help from you in the community, is because I asked the same question to Bluetti support here in Brazil and they were not even able to show the calculation that you presented of the 80% estimate. They misunderstood my calculations, disregarded the solar panel charging and, when I sent a second email with even more details, as I did here, they simply informed me that my calculation was wrong and that the total discharge is normal.
Exactly yesterday (January 14th) marked 1 year since I purchased the equipment, so I will request the warranty so that they can check it.
Let’s see what the answer will be…
Thank you very much again for your help and clarification, Erik!!
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Hi @rodperrone, We truly care about your feedback.
Thank you very much to @Selfmadestrom for the detailed and professional response; it is incredibly helpful.
When you mentioned your dissatisfaction with customer service in Brazil, we would like to investigate this matter and arrange an upgrade service for you.
Could you please provide your ticket number or let us know your contact details via private message so we can follow up on this? We are eager to improve our service, and your feedback encourages us to keep striving for progress.
1 Like
Hello “Bluetti Moderator” 
I agree with you and I would like to thank one more time @Selfmadestrom for his attention and clarifications.
Regarding my problem here in Brazil, your support will be of great help. I will send you the necessary information via private message.
Thank you very much!
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Hello again @BLUETTI_CARE !
I don’t know if I used the wrong way, but when I tried to send you a private message I received the information
“An error occurred: Sorry, you cannot send a personal message to that user.”
Could you send me a private message?
Thanks!!
