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alex-solar avatar image
alex-solar asked

3-phase Quattro 48/10000 + BYD B-Box 10,5 L (2 units) + Fronius + Solar - off grid

Hi, we have an off-grid installation and have ordered 2 units of B-Box 10.5 LV batteries. After orderind we saw Victron blogs with next info:

Is that mean that the only way is to change the batteries for example to B-Box Pro? We plan to use it with Fronius Symo 15.0 + solar panels + Quattro 10000 (3 units) in 3 phase system.

Now we have next situation: when we turn on the B-Box L without any consumers it wors ok, after that we connect color control GX and it found the B-BoxL and show all the spec. But when we turned on th B Box L alredy with connected CCGX the battery goes into error.

So the question should we change the batteries? And why the similar B-Box pro is ok for off-grid and B-Box L is not suited?

Thank you!

CCGX Color ControlBYD
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byd-service answered ·

The Bbox LV is not approved for off grid use so unfortunately it wouldn't be covered by the warranty.

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alex-solar avatar image
alex-solar answered ·

If we don`t talk about warranty, is it possible to make it working? and what is the technical difference between B-Box Pro and B-Box L?

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byd-service avatar image byd-service commented ·

The LV will work as long as there is a CCGX, it won't differentiate if it is on or off grid. However, as the components have not been sized for the power surges that can happen in off-grid, you can either have the batteries shutting down or even damaged.

To remove the off-grid variable. Please isolate the batteries from the inverters and try to switch them on, on their own and use the web portal to download the alarm history.

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Anil Ghatikar avatar image Anil Ghatikar commented ·

In my opinion, 21 ( 10.5+10.5) KWH is too small for 30(10KW x3) KW inverter system in case of offgrid use - Typical ratio KWp/KWH for LIfepo4 are betwen 0.5 to 0.7 for many brands so for 30 KW system you need between 42 to 60 KWH of Lifepo4


Did you check the min capacity recommendations for offgrid use by BYD - 2.0 min battery sizing requirements

https://www.victronenergy.com/live/battery_compatibility:byd_b-box

in your case of off-grid minimum 6 units of 12.8 BYD pro or 18 units of 2.5 KW Pro are recommended.

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