Hi,
regarding the model kit AC300 + B300, I already have solar panels outputs:
DC1 : +/- 2.600W = ~ 235V / ~ 250V
DC2 : +/- 1.800W = ~ 145V / ~ 160V
can you confirm if I can use the single DC2 solar panel output into split cable connected on both AC300 PV1 and PV2 in order to split both the output what’s from 1.800W into 900W each and voltage will be half as well under the limit of 150V on each PV1 and PV2 MPPTs?
Hi @cassio
welcome to the bluetti community forum.
The AC300 have two MPPTs and two seperate Strings. Each string can have up to 150V. Not more. As long you stay under 150V per String you are fine. Otherwise you cant use it.
greetings
Erik
@cassio
Check out the D300S voltage drop-down module.
It is precisely for what you seem to be describing.
in the Bluetti D300S manual is not clear the max input if its total or per PV?
"Applicable Models: AC300/AC500/EP500/EP500Pro
Because from the two strings connected at same time, the maximum input will be above 4kw/h at some time of the year considering each PV maximum at:
PV1: ~2.600W
PV2: ~1.800W
Can I still connect both at the same time or need to split one of the strings in PV1 and PV2 into the D300S?
Hi @cassio
as far i understand the manual, you have two MPPTs (PV1 and PV2) which can have a maximum of 550V open cicuit voltage each. This 550V step down to a usable voltage that AC300/AC500/EP500/EP500Pro can use (around 140V).
As long you stay within the Voltage parameter of PV1 and PV2 you are fine. However, according to the manual the D300S can only export 3000W to your unit, even when you stay within the voltage and could have more power.
if Bluetti support can confirm that,
if D300S can use at least one of the strings with split cable with parallel/others (?) setting in AC300
or if it can have with both PV1 and PV2, with each PV below 3,000W and less than 550V?
Thanks!
Hi @cassio, Please note the following key points.
1. When using the D300S, select “Others” for the charging method and turn off PV parallel mode.
2. You can use both the PV1 and PV2 interfaces simultaneously, but the total input power must not exceed 3000W.
The maximum output power of the D300S is also 3000W; exceeding this would be wasteful.
The input voltage range for each channel of the D300S is 120-500VDC, 15A Max; the output voltage range is 65-135VDC, 26A Max.
3. What is the total open-circuit voltage of your DC2 (145V~160V) solar array? Could you provide the specific specifications of the solar panels?
If the VOC is below 150V and the power is greater than 1200W, you can enable PV parallel mode and connect the two solar arrays as shown in the diagram.
If the VOC is above 150V, you will have to step down the voltage using the D300S.
We extend our gratitude to @Selfmadestrom for his attention and solution to this issue.
Hi,
I already mention in the first message from this thread this outputs available from the fixed solar panels that I already have, since will be using D300S only during total energy blackout > 24hours to recharge the bateries from AC300 + 3xB300:
DC1 : +/- 2.600W = ~ 235V / ~ 250V
DC2 : +/- 1.800W = ~ 145V / ~ 160V
both solar panels output are above the 150 voltage, so that is why the D300S could fit in this case, each PV will not get above 3000W with both still below total 500VDC and 15A.
but if PV1 and PV2 connected in D300S and both PVs generate above 3000W around 4000W in peak times in total, will this damage the D300S? or just will be limited from 4k in total to 3k without damaging the D300S equipment?
if that is the case of damaging D300S from total PV1 and PV2 above 3000W as last option, should I use only PV1 with max 2.600 W connected at D300S or it can be be split in both PV1 and PV2 input from D300S to improve performance?
Thanks!
To simplify how that is working, you have to imagine this:
So from a safety standpoint it doesn’t matter how much watts your panels can provide or how much watts your charger can handle. If your charger can handle 3000 W it will handle 3000 W at maximum, even if your solar array is rated for 6000 W.
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But, as already asked by @BLUETTI_CARE what you should be concerned about is the voltage.
And the maximum voltage reached by your solar panels is shown with the acronym VoC on the label that you will find on the back of your panels. VoC multiplies when your panels are series-connected and VoC should not exceed the maximum voltage that your device can handle.
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To give you a more precise answer please state your solar panels specifications and how they are connected together.
Simply connect the panels in parallel so that the voltage per input remains below 150 V.
The current A is automatically reduced. Its so simple.
Hi @cassio, Regarding this issue, please note that the D300S can handle a maximum input power of 3000W; any excess will be wasted.
As long as the total voltage does not exceed 500V, the D300S will not be damaged.
We thank @ndwr for the detailed explanation. Indeed, please provide all the detailed information about the solar panels. This will help us identify the problem.
So regarding the already in place Bell on-grid inverter connected with the input PV1 and PV2 information available from the display are:
PV1 = maximum peaks at 2.600 W, ~250VDC and ~10A
PV2 = maximum peaks at 1.800 W, ~160VDC and ~10A
Since only for backup usage and if total voltage below 500VDC, in this case the total is around ~410VDC so I am not worried about wasting some power only during high peaks but focus in maintaining the off-peaks as higher as possible from D300S output into each AC300 MPPT PV1/PV2 inputs with the maximum of 1400W and 2400W in total as much as I can during the day with the solar energy available.
So regarding from your explanation it seems to be safe that option when connecting both PV1 and PV2 available even if wasting some Watts during high peaks since it will not damage the equipment only if not above 500VDC, so the total ~410VDC is safe in this case.
Thanks!
Hi @cassio, Thank you for sharing. Yes, as long as the input voltage is below 500V, it will be very safe.
Your solar array has high power output, and we hope you can enjoy an endless supply of free solar energy.
Please feel free to contact us if you need our help.
