Battery/Inverter compatibility

[MrJMegson]

Hey guys, I'm not a sparky and am intending to install my own Solar PV system.

 

I so far bought the panels and inverters, and am trying to get batteries. I want 8 X Pylontech US5000 batteries ideally (4 on each inverter).

 

However, I think I've F'd up. The inverters I've bought are FOX H1 6kw Hybrids. Everything about them seems perfect except for the battery connection.

 

I looked in the box yesterday and noticed the battery connections are via MC4 6mm connectors, rated at 50A max.

 

Now to me this doesn't sound sufficient at all, I think I need way thicker cable and a much higher Amp rating.

 

The inverter has the following specs:

Bat volt range 85-450v

Recommended voltage 300vdc

Max charge / discharge 6000w

Max charge/discharge Amps 35A

 

Battery spec:

48v nominal,

charge/discharge 43-53v, recommended charge/discharge 80A,

Max continuous 100A,

peak 15min - 120A, 15sec - 200A.

 

Are these totally incompatible? The stats on my inverter seem to suggest to me that it can't handle any large batteries.

 

I hope you guys can explain this to me.

 

Thanks,

 

Jason

[kommando]

The inverter specs for the battery read like they are the solar panel specs not battery specs as do the MC4 connectors which are the typical panel connectors. Reread the manual, chinglese can be badly confusing.

[Dillsue]

Look at the inverter and battery voltage- big mismatch.

 

If the inverter is expecting a 300vdc battery you can use much smaller cables than youd expect to see on the 48vdc battery. A 10kw solaredge battery connects to its inverter with MC4 connectors and that pushes out 5kw sustained and 7kw for short bursts, all through MC4 connectors.

[SteamyTea]

Don't you just series conn CT up enough batteries to get into the required voltage range?

 

[Dillsue]

On 10/09/2022 at 11:50, SteamyTea said:

Don't you just series conn CT up enough batteries to get into the required voltage range?

 

Maybe, but the OP is saying 4 batteries on each inverter and 4 x 48vdc wont give the recomended 300vdc the inverter is looking for. Im not up on battery tech but do know that theres "high voltage" PV batteries around which operate at several hundred volts which maybe what the OPs inverter is intended for?? Solaredge Energybanks operate at 350-450 vdc which matches the typical incoming DC from an optimised set of panels which the energybank is directly connected to.  Maybe the OPs set up is similar??

[Radian]

On 09/09/2022 at 17:06, MrJMegson said:

The inverters I've bought are FOX H1 6kw Hybrids.

 The batteries used with that inverter  appear to have this spec:

 

Specifications for HV2600 Battery module HV2600 Nominal capacity (kWh) 2.6

• Maximum charge voltage (V) 58.4
• Discharge cut voltage (V) 40
• Max. charge/discharge current (A) 50A/50A
• Operating temperature (°C) -10 ~ 50
• Storage temperature (°C) -20 ~50
• Charge/Discharge efficiency (%) >98
• Ingress protection IP21
• Protective class I
• Cycle life >6000 @25°C @90% DOD
• Available SOC range 10%~100%
• Weight (kg) 29.7±1 kg
• Dimensions (L*W*H) (mm) 420*480*116

So similar to the Pylontech, although you should make sure of that.