Solar battery and V2L

[AmperaE]

@Everest
I just checked the voltage of the v2l. It's 217V ac. The grid reading is 248V. Is that difference within tolerances?

Suppose I'm switching to an isolated charger, will my batteries (2x 5.3kWh Solax T-BAT-SYS-LV-D53 battterypack). allow a second dc input? Will that not interfere with the BMS etc.

 

[siteguru]

217V is right near the bottom of the -6% tolerance for a nominal 230V supply. (-6% / +10% = 216.2V to 253V)

 

[Everest]

@Everest
I just checked the voltage of the v2l. It's 217V ac. The grid reading is 248V. Is that difference within tolerances?

Yes it is (just), as @siteguru confirmed

Suppose I'm switching to an isolated charger, will my batteries (2x 5.3kW Solax T-BAT-SYS-LV-D53 battterypack). allow a second dc input? Will that not interfere with the BMS etc.

If galvanically isolated, it is fine - that's what Chargeverters and similar devices are used for. But, you will need to consider the maximum charge current and fusing aspects, as I mentioned in post #8 in this thread..
things that @Everest said about charging batteries...

 

[wattmatters]

2x 5.3kW Solax T-BAT-SYS-LV-D53 battterypack). allow a second dc input?

Presumably they are nominally 51.2 V battery packs, typical 16S LFP configuration.

Will that not interfere with the BMS etc.

BMS is internal to the battery however it may be communicating with the inverter. Even so, it won't matter, just set the charger to a modest voltage (e.g. ~55 V) and it will stop charging before the BMS needs to do anything.

Ensure you have an appropriate fuse between the charger and the battery (it may have one built in depending on what you are using).

The idea is just to provide some supplemental charge, not be a primary source of energy.

 

[AmperaE]

@wattmatters Thanks for your explanation. Solax however claims you need to use their T-BAT-Charger, which is not compatible my LV inverter :-(

 

[wattmatters]

Solax however claims you need to use their T-BAT-Charger

Well they would.

I don't know all that much about Solax kit, are the battery modules operating in series or in parallel? If they are in series then yes you'd need to stick with a charger they suggest.

 

[AmperaE]

I think it's master/slave, but the batteries level between themselves.

Li-ion Solax-LV
Max Charge Current: 50A
Max Discharge Current :100A
Bat Online Cnt : 2
Battery Parallel Mode :Converge

Master/Slave Settings: Single
Parallel Numbers : 0

 

[Everest]

Datasheet for that product suggests regular 16S configuration with nominal voltage being 51.2V.

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