FoxESS Community - Owners & Installers Forum

Hello,

Less than a year ago I bought a H3 12kw 3-phase inverter along with 8x Mira HV25 batteries (19kwh)
I now want to increase the battery storage but apparently the H3 only has one battery input and you can't stack Mira BMS units.

I have been given the following proposal from the installer.
- Buy a new H3 Pro 15kw to replace the H3 (Due to physical space limitations I can only have one inverter)
- Run my existing Mira HV25 (19kwh) on the one battery input
- Buy an EP12 (11.5kwh) battery and run that on the second battery input

The primary reason is the access and stock to the Mira HV25 locally is a major challenge.

I understand they both high voltage but are there any caveats or concerns in running such a setup?

Would greatly appreciate any insight or guidance on this. Thanks.

Just a few thoughts,

Whilst the H3 pro is a good option and as described it has 2 distinct battery stack inputs - the only ‘caveat’ advice i’ve been given is that batteries should be close in capacity and 11.52 / 19kWh sounds like it may be a bit unequal - i’d really want to hear Fox confirm they are ok with this imbalance, if they are ok with that then agree it is a good option.

But also just to add, there will be a reasonable price to upgrade to the H3 Pro with all the install work that goes with it, so it might be as effective to remove the Mira batteries (as they are difficult to get hold of and sell them on ebay or similar, I doubt they will be around for long) - then buy 3 * EP12’s or 4 if you want maximum capacity.