Hi,
My AC500 will not power on. I have a bit of experience with this and know how to check the connection with the battery (B300S) and make sure they are both in the locked position. So, yes, I have done that. I have had it take some time to come on before, so I plugged it in to charge. The battery light comes on, but after another full day of being plugged into a wall outlet, it still will not come on. I would try solar but it has been thick overcast and raining for days. Anything else I should try? I go back on the road in a few days after being stationary for a month for the holidays. This is my full-time power source for living in a van.
Any help asap is very much appreciated.
Thanks.
Is the battery empty or full?
If it is empty, has it been empty for some time? If yes, it may be in an over-discharged state.
Here is someone with an over-discharged AC300+B300.
I do NOT recommend taking it apart like this user did.
Because it may void your warranty and you risk electrocuting yourself, causing a fire or destroying the battery. I just want to show you that this condition exists. The BMS should have protected you from this but apparently it does not always work.
If you happen to have a Bluetti T500 AC charger you could try if you can charge the battery with that.
Hi @llewella, We are deeply concerned about the issue you are experiencing.
Yes, please refer to @TheQuickFox’s suggestion to check the battery level of the B300S. If the B300S is out of power, the AC500 will not be able to turn on.
Disconnect the B300S and charge it separately using the T500 or solar panels. Does this help? Please note that the B300S accepts a DC voltage input range of 12-60V, so your solar panels must meet this specification.
After successfully charging the B300S, reconnect it to the AC500. Can the AC500 turn on normally? If not, the issue might be that the parallel cable is not properly locked or the cable itself is faulty. Please try testing with a different cable.
If the B300S cannot charge properly, it is likely a battery fault, and you will need to contact customer service to arrange a return for repair.
We do not recommend customers attempt self-repair, as non-professional handling may cause unforeseen damage to the unit and void the warranty.
Thank you. I have no idea what the battery level is without the AC500 telling me so. The battery light does come on and stays on. As said, there hasn’t been sunlight to charge with solar, which is why it probably drained over the past few days and I plugged it into AC. I do not have the T500 as it is always out of stock and very expensive and I do not have an extra parallel cable to test. A T500 did not come with my setup. I’ll attempt to charge the B300S with solar when the sun comes out again which looks like it is to today. I cannot recall the voltage of my rooftop panels setup, but I do have 2 PV350s so I’ll drag one of those out to try to charge the B300s. I will not try to fix this myself, believe me. This is under warranty, very well taken care of, and I need this to survive.
I am happy to report that the sun came out this morning and “woke” the system up (I had a portable PV350 plugged directly into the B300S). I then connected the B300S to the AC500 again and plugged it into AC Power. It showed 0% but soon started showing charging. I am so relieved.
Thanks all!
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Lovely to hear that! Thanks for updating is. Shipping these beasts back to Bluetti (Or your seller) for a recovery recharge is no fun.
When the battery is fully charged via AC power, you may want to check for firmware updates for both your AC500 and B300S battery via the Bluetti app. Disconnect any load and connect to your AC500 via bluetooth. Firmware updates may improve the BMS or fix issues like the battery entering a deeply discharged state.
Besides that: It is always recommended to recharge your battery quickly after it was drained. But I understand that when you are in a RV and are away from any grid charging it may not always be an immediate option to recharge.
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Thanks TheQuickFox. I will check into updating the firmware. I was surprised it was dead as it usually stays charged via solar with just a trickle charger to my diesel vehicle’s house batteries on it while visiting home for the holiday. But several days of clouds and rain drained it.
Thanks again. I have to say I was in a slight panic. I had an AC300 and B300 but had to return them for the issue twice. I decided on the AC500 and B300S. I really miss all the outlets on the AC300 though. The 3 big ports for RVs are not useful to me though I thought they would be. I am now shopping for a small unit for constant connection to the diesel heater… Anyway, thanks again.
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I can understand your dread of this condition. I would feel the same. These are expensive units. The BMS should have protected you against this condition from happening in the first place. It’s a pity and a bit of a worry that it did not.
At least you learned a way out of it in case it would ever happen again.
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Hi @llewella, Thank you for sharing this great news! The solar charging successfully revived the B300S battery and the AC500 system.
Special thanks to @TheQuickFox for consistently providing expert-level advice, which has been incredibly helpful.
We also truly understand the concerns of our users.
At present, we’ve received many suggestions to retain some battery capacity to avoid over-discharging. However, implementing this on older models is quite challenging due to hardware limitations.
We are continuously working to incorporate more customizable features into new models based on customer feedback.
If you are considering purchasing a smaller device, we recommend the Elite 200 V2 or other new models, which offer significant advantages in optimizing battery system performance.