FoxESS Community - Owners & Installers Forum

Hello, everyone,

I'm hoping to get some advice on a compatibility issue I've run into while setting up a new battery system. I have a FOXESS H1 5.0 E1 inverter and I was planning to connect a Fox ESS EQ4800 L9-41.93kWh stack.

I've looked at the manuals for both devices and found some technical data that suggests there might be an issue, but I'm not sure how critical these differences are.

Here are the specs from the manuals:

My Inverter (FOXESS H1):

-Max. Battery Voltage: 450 V
-Max. Charge/Discharge Current: 40 A

The Battery Stack (Fox ESS EQ4800-L9 41.9KWH):

-Operating Voltage Range: 365.4 V - 463.7 V

-Max. Charge/Discharge Current: 50 A

I have two main concerns, and I'd appreciate it if someone with more experience could clarify them for me:

1. Voltage: The battery's maximum voltage of 463.7 V is slightly higher than the inverter's maximum rating of 450 V. The difference is only 13.7V. Is this small difference negligible, or does it pose a risk?

2. Max Current: The battery can supply a maximum current of 50 A, while the inverter is rated for 40 A. My assumption was that the inverter would only ever draw a maximum of 40 A, so the battery's higher current rating would just provide extra headroom and not be an issue. Is this correct, or is it a more serious problem?

Any guidance on whether this is a safe and workable combination would be a huge help. I don't want to risk damaging my equipment.

Thank you in advance and greetings from sunny Portugal!
Henrik

Your understanding is correct, your H1 first generation isn't compatible with a full L9 of EQ4800, as it won't be able to get the batteries to their full voltage. You can install a smaller version with fewer slaves to operate within the voltage limits.
I would personally just upgrade the inverter to a Gen 2 H1 and go with the full stack of EQ batteries and sell the older inverter on ebay.

Hi, thanks for your answer. Im a consumer and not capable of switching out the inverter, I also dont dare to do this. I do however have the capability to assemble a battery stack. So a stack of L7 will work? Im not set on 41.9kwh. Can you tell me if a Fox ESS EQ4800 L7-32.61kWh will work out? Thanks again

//EDIT I realized you also answered me on facebook. I just need a confirmation before I go ahead and order a EQ4800 L7-32.61kWh stack as the seller is in Netherlands and im in Portugal so sending it back would be a desaster.

Yes, an L7 or even an L8 will both work with your system. It's just the L9 that won't work correctly.

Solved! Thanks so much

Most welcome