Home UPS - for the UK

[Chris_King]

I have had my BE850G2-UK now since Oct 2023, but have a few questions.

My unit has the 850va / 520watt, is there a specific battery when i do come to replace it, i.e. each model in the range has different va and watt, so is it the same battery for each? (there isnt a specific one for each VA/Amp?

Is there a larger battery (not in physical size) that holds more va/watts that would allow it to run longer in the even of a power cut or outage?

Finally it comes with a USB/RJ45 cable, that allows me to connect a PC to the USB to logon and check the settings etc, is it possible to connect a normal RJ45/RJ45 to the unit and plug in a router (for example) to allow it to be accessible by any PC in the home network as long as the software is installed, the fact it has an RJ45, I was wondering what the scope of the RJ45 interface was with regards to network capabilities.

Chris

[Teken]

Your model already uses the largest capacity battery available in its physical size (9 AH vs 7.5 AH).

There are no sealed lead acid batteries with larger capacity. There are LiFePO4 battery cells with larger capacity but these can not be used safely in a UPS.

The most common problems seen trying to use a LiFePO4 cell is improper charging / float voltage. Next, is current (amperes) limitation of the BMS. 

The battery (LiFePO4) can easily provide huge amounts of current for short bursts / duration. But typically the internal BMS will limit this and thus you don’t see the benefits of going this route. Besides that a vast majority of the BMS will not allow the UPS to recharge the cells because of the (BMS Protection Circuit) engages.

Meaning when there’s a grid down event and the UPS runs flat. Once power is restored typically the UPS charging circuit would begin to recharge the cell.

In this case, the internal BMS (low voltage protection) circuit stops this from happening. 🤦‍♂️😢

Some crafty folks have made modifications where they use a toggle switch to fool the BMS to reset. Once reset the UPS internal charging circuit can operate normally. 

As it relates to accessing the Power Chute software remotely. There are a few solutions and really comes down to your technical skills to willingness to learn to do so.

Those solutions can span from using remote access software like (Team Viewer) or similar to the built in Windows access management.

To using hardware solutions like a KVM (Keyboard-Video-Mouse). You could also use a VPN (Virtual Private Network) software package to do the same.