Solor panel labels

[KK wind]

I have ordered a Bluetti 200 max and would like to order some 200 W panels but am confused on the labels. I will have a 50 to 55 ft 10Ga run in series to keep the amps down but am not sure which Vol to add up to stay in the limits. Bluetti says 900W max solor 10-145VOC 15 A. I would like to have 4-200W 24V panels from rich solor, label says VMP 37.6. IMP 5.32 VOC 45.4 . I thought I just added the 24v but not so sure now. Thanks, keith

 

[Bud Martin]

The total Voc of the string + 20% headroom for cold temperature should not exceed the max PV input (145V?) Voltage spec of the Bluetti.
If you have 4 panels, then I suggest 2s2p configuration so Voc of each string is 90.8V and with 20% headroom it will be about 108V.

 

[Rednecktek]

I would like to have 4-200W 24V panels from rich solor, label says VMP 37.6. IMP 5.32 VOC 45.4

So the VoC is the key number to prevent frying your charge controller. If you did a 4s that would be 182v which would fry your poor Bluetti. Go for a 2s2p and you'll only have 91v and 10.6a which are both well within the limits of its controller AND good numbers for efficient charging.

The VoC is used to prevent frying controllers, the VMP is what it should put out when there's actual load on the panels.

I thought I just added the 24v but not so sure now.

24v is a marketing term that means "Will create enough power to charge a 24v nominal battery bank, but not a 48v bank." Similarly, a "12v Panel" will create enough to charge a 12v nominal battery but doesn't produce enough juice to charge a 24v bank.

 

[KK wind]

Now I understand, thanks everyone