and my question is , i have space to add 1 more solar panel which would be JA Solar (JAM72S30-525W) Bifacials , if i put it in the 2nd string im coming pretty close to the 150v limits … close to 147V (if u calculate the losses from a 32 10awg cable of each string)
if for some reason i get passed the 150v limit (if the bifacials get peak, or on winter in low temperatures) will the bluetti handle it ±5%? should shut down? or cutt off the excess voltage? is it safe? can anyone from bluetti confirm this?
Power losses and voltage drops are not to be considered when calculating the total VoC of your string.
When the internal MPPT solar charger is idle and current is 0 the voltage would be always very near to VoC since lack of current basically means lack of losses.
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Personally in your situation I would use a 3S configuration for both strings since that would mean string #1 with a VoC of 150.36 V and string #2 with 148.92 V. A voltage offset of 0.36 over the limit in my opinion it would not be relevant.
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The AC series internal MPPT charge controllers are equipped with 250V electrolytic capacitors on the PV inputs, so it is not so easy to damage the unit due to overvoltage.
@sneekpeek
Even a slight exceedance of the VOC limit will report an error. To avoid this, you can connect the extra solar panel to your B300S instead—this will keep the VOC within range.
If needed, you can contact our support team to purchase a PV charging cable.
What the manual says is: maximum PV input voltage is 150 V (that is to be read 150.0 V) so - even if there is a safety interval over the maximum voltage that will make the AC500 reporting an error and they only way to know if that setup can work for you is to try - nobody will ever take the responsibility and declare that is safe to input 150.36 V and that you should do it.
