Sunsynk (DEYE) Hybrid Inverters

Ah great thanks for that

Thanks for the replies! My biggest concern would be that I wouldn't be able to go down the DIY battery route with the BPE one! Do you think that might be a problem? It seems to suggest that it is compatible with Lifepo4 batteries but I honestly don't know enough yet about the whole thing to be sure.

Will do and will report back if I get a reply!

Compatability is generally seen as the BMS can talk to the inverter directly.

However, I have recently dumped this approach and configured by Deye for a Default Lead-Acid type setup. I got sick and tired of the JK calculated SOC. So the Deye calculates it's own SOC %. The BMS manages the LiFePO4's, but basically just looks after itself.

So it's actually not the worst thing in the world to have a standalone BMS. Let it manage the individual Cell Under and Over voltage and charge current

Correct. It's somewhat down to the battery voltage and what voltage the inverter can take. Ideally you want something mid 40's to high 50's

I thought it was the electrician who needed to submit the NC7 form? Information very vague online as to what can be DIY and what has to be done by an electrician.

And when it comes to solar PV, do you only need an SEAI approved electrician for the purposes of getting the grant? I have no interest in the grant so would be great to liberate myself from SEAI.

Edit: Useful article here:

https://irish.solar/is-it-legal-to-install-your-own-solar-panels-in-ireland/

Seems any electrician can do the final hookup to the fuseboard. But still not clear on whether an electrician needs to sign the NC7 (or if it's more likely to get approved if an electrician does it)

Exactly. Why use quasi intelligence from cheap devices when it is based on poor measurement? Forget about SOC, use voltage instead. That never lies and is easily measured. The BMS will still protect the cells in the same way and you will get more use out of your battery that way.

I got my battery hooked up in the last few days and am trying to figure out how to export all solar while still powering the house from the battery. I'm using the SunSynk HA addon via the RS485 port and have the JKBMS connected via ESPHome BLE. I have the battery behaving as I want but the inverter is charging it with any excess rather than allowing that back to the grid. What am I missing?

Problem is that Sunsynk will "export" what you set the max sell power to. What you then really export or import depends on your load.

I.e. if you set export to 4000W and your load is 5000W, it will actually import 1000W from the grid

I find this the biggest con of the Sunsynk / Deye system