i have ebike battery rated 52volt with max voltage that goes up to 58.8 volt.
Would my Ac 70 be able to accept 58.8v? or it must be below 58volt strictly
This means I need to charge my battery no more than 95& which is tricky…
@davidjunlee Sorry I don’t quite understand your description.
Do you mean charging the AC70 with a bicycle battery? Or are you using the PV to charge the battery? I need to know your charging input source.
charging the AC70 with a bicycle battery?
Yes through the xt60 input
The ebike battery is 52volt but voltage fluctuate depending on the charge level. So at max it will be 58.8volt. The question is can my ac70 take 58.8volt ebike battery charge?
I know it will work if my ebike battery is let’s say 95% or below charge level given the rated input voltage spec
Hi @davidjunlee
its really important not to exceed the maximum limit of the MPPT. 58V is the limit. You may lucky with being that 0,8V over and it dont burn, but i wouldnt risk it.
greetings
Erik
Even by .8 volt? That is underwhelming.
There will be a slight tollerance. But when you over the limit, im sure warranty claims are not possible anymore.
I would like to hear from BLUETTI official on this…
Aside from the inefficiency of charging a battery with a battery, and by taking for granted we’re talking about a lithium battery, please consider that the maximum charging voltage of your battery is not your nominal battery voltage.
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Your charger increases the potential to 58.8V to allow current to flow into the battery, and this lasts as long as the charger remains connected. As soon as you disconnect the charger the battery voltage will slowly turn back to the nominal voltage.
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That means if you are going to connect the battery to the solar input of your AC70, you will always have a voltage that will be lower than 58.8 V.
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Please use an appropriate tool (e.g. a multimeter) to check the voltages and draw your own conclusions.
Thank you this is very helpful. I wonder what the nominal voltage will be when it’s fully charged
@davidjunlee
The AC70 will report an overvoltage error if the input exceeds 58V, but it won’t cause adverse effects; the machine has a certain voltage tolerance, no need to worry too much. If it can’t charge, you need to discharge it first.
You would be better off not pulling 580w/h (58v x 10a) out of your bike battery. You may shorten it’s life. Can I suggest running the power of your bike battery through a 60v to 24v, 10a step down converter (or similar numbers), so 240w. They’re quite cheap on Ebay or AliExpress. I’ve done similar with my EB70 (inferior predecessor to the AC70). It effectively doubles the capacity of the power station … of course with the caveat that your bike battery probably isn’t the safe LiFePo4 chemistry that your Bluetti is
You need to limit the current that is flowing from the ebike battery to the AC70 as well. Be careful as the ebike batteries can overheat if too much power is drawn from them and could start a fire.