Solis Hybrid inverter with DIY battery

https://www.boards.ie/discussion/comment/120174226#Comment_120174226

good work graememk.

I suppose at moment I won't need to communicate. Initially the only "automation" required will be to enable some load shifting, hopefully Solis should manage it.

graememk

Haven't ran the solis without a bms, but take it conservative on the intial charge, start at 55 and slowly bump it up, and keep an eye on the cells, as there's nothing to tell the inverter to stop.

https://www.boards.ie/discussion/comment/120174364#Comment_120174364

I'm running my pack without a BMS at the moment (but with the NEEY) and that is exactly what you need to do, particularly if you haven't fully top balanced all your cells first. And not only going up, but also going down. So I would charge up to maybe 54V first and don't let it go down below 48V first either (this is still cycling between 99% and 10% or so)

Will the user defined settings photoed above work for lifePO4

https://www.boards.ie/discussion/comment/120232486#Comment_120232486

They will work with any chemistry, even lead acid!

A better question might be will they work effectively? Just want something to get me going in a way that is half right and won't harm the battery life. I can fine tune later.

Of course. Some say more effectively than if you use a BMS 🤣

You need to set the voltages right though and you need to keep an eye on the system and check your cell voltages particularly if you don't have a balancer either. Basically all the stuff that a BMS is supposed to do.

https://www.boards.ie/discussion/comment/120232617#Comment_120232617

Yup have the JK bms. Will have that setup right,

graememk

Have this built waiting on some printer filament before sending it off for testing.

Lads,

Is there a max battery size for SEPLOS BMS, I read on some sites 500AH ? - considering expanding to 30Kw

Also, currently I am eyeballing the weather forecast and setting the battery charge on a nighty basis but its a bit of a pain, I am wondering if there is some way that I can have Home Assistant control the BMS when it hits a certain SOC to prevent the battery from charging fully? For instance the batteries charged fully last night and today the solar is only fair today so there will be no waste but yesterday morning they were charged fully but the sun was out most of the day, if I had not have been at home to plug in the car most my leccy would have went to grid. so looking a simple way to set the BMS to stop charging at a certain SOC. Was considering modifying one of the temp probes to simulate overheating or excessively cold temp of the battery to turn off charging.

Several people are doing that @Big Lar. Check the home automation thread in this forum

Thanking you @unkel, will hav a look

As you have lotz and lotz of batteries, do you know if the SEPLOS is good for 30Kw of batteries?

https://www.boards.ie/discussion/comment/120253716#Comment_120253716

Seplos and I did not get on, we got divorced. I've remarried since (JK BMS) 😁

But as for any BMS, I can't see any limitation really for the number of cells used. I've 40kWh on the JK BMS no probs

Deleted

Anyone know what the auto battery awaken new setting is?

as my JK BMS doesn't comm with Solis the battery shuts down and needs to be manually restarted at moment. Pain in the ass

User defined option seems to be gone in latest firm ware? So I am using Lead acid settings - but that caps charge around 40a or 2.2kw/hour....any suggestions?

https://www.boards.ie/discussion/comment/120945604#Comment_120945604

To solve that problem I set the inverter Over Discharge voltage to above the JKBMS so that the inverter disconnects the battery before the JK switches off.

Thanks will try that

Will yours charge any faster than 2.2kw per hour ?

https://www.boards.ie/discussion/comment/120948331#Comment_120948331

Yes

Hmm interesting- any idea why mine won't go over 2.2kwh, I also have jk bms

ps is that a home assistant interface?

https://www.boards.ie/discussion/comment/120948275#Comment_120948275

So this hasn't worked can't set higher than 48v, and think I need to be 49v?

https://www.boards.ie/discussion/comment/120979603#Comment_120979603

I have the BMS lower than 48V, inverter here turned off the battery last night at 3:00am(2:00am inverter time)

For me the JK reads 0.3V higher than the Solis inverter, the lad in "Off grid Garage" saw the same difference, also see the BMS graph below the voltage just dips down and recovers, from here the battery will only power the inverter and not feed back to the house until it starts charging again.

Cell 9 which is the lowest cell I have drops to 2.94v so no harm done.