Seplos BMS

This is very useful @Geeyfds53573 and @Jonathan 👍️

I tried it out on my Solis Hybrid, and it also draws from the battery while in Feed In Priority mode. The solis docs on this are at least confusing, if not incorrect...

As a limited test (done just once), I set to FIP mode, observed that the battery power in/out went to 0. So the Eddi then kicked in as generation was greater than consumption at the time. Then, I turned on a few appliances to get house load higher than generation, and the balance was indeed taken from the battery.

One interesting thing is that after I turned off the appliances (i.e. house load < solar gen), there remained approx a 280w draw continuously from the battery: it didn't go back to 0 as I'd have expected. Perhaps this would drop over time... I just waited a few minutes. I don't think this is will be a big deal.

My CALB batteries and have arrived now, and have a Seplos, so I'm watching the experiences of @irishchris and others with interest. It'll probably be a few weeks before I start the build, so may have a few questions then.

But, this FIP mode does appear good if need to prevent SOC reaching 100%. I guess set to FIP when SOC hits 98%, and back to Self Use at maybe 93%

It also answers the question in the Automation thread about how to prioritise Eddi/Immersion over battery with a Hybrid Inverter. Its not such an issue these days as generation is high in the mornings, but come Autumn, will probably set FIP mode in the mornings to put 2kwh into the Eddi/Immersion before the battery is full.

For anyone setting this through automation, (on my system at least) write 96 to holding register 43110

This is the same register that controls Self Use charge on/off (values 35/33)

From reading the various posts, I'd understood that reaching 100% was one of the main triggers for issues. I haven't started my DIY build yet, and am just getting the various pieces together now, including seeing what configuration/workarounds may be needed. So, it's not based on any practical experience with DIY battery at this point, only prep, and I definitely could be mis-reading the situation. If it isn't really required for this purpose, then that's even better.

That's good to hear its not happening anymore for you. I'm going with 16s2p. I may be pinging you in a few weeks asking for config help 😉

Anybody here having an issue with seplos handling continuous charge or discharge at 100 amps?

After loading new parameters I received from seplos yesterday I went to do a full charge & discharge cycle for BMS to learn capacity but it seems to run at 100 amps in short bursts before settling back to 65 or so amps. Also noticed this evening with kettle and hob on it was only pulling 3kw from battery pack and rest from grid when my inverter is capable of pulling 100 amps and had no issues with the previous pylontechs doing it.

Also separate question for people wiring their seplos did you connect all three positive terminals to cables and if so how did you combine them before connecting to inverter?

Oye Store on Ali Express. Ordered in March.

I sent the on with them. These are for my 16s2p pack

Interesting I will have to look back through my history on usage to see but never noticed it dropping below 100amps when was needed for cooking etc in winter. Good to know though and absolutely terrible if it is the case!

You need to watch their temps. The inverter is passively cooled and actually more designed for to be mounted outdoors rather than indoors. A good amount of them in Ireland are placed in the attics and these places get roasting during sunny days.

I did notice on the first week after install that my inverter is getting hotter than I want it to be. I could not keep my hand on it. I've measeured the temp of the radiator on the back and it was above 70 degrees. So the inside temps are even higher. I made 2 shrouds for 120mm PC fans and now internal temp rarely goes above 40 degrees. Been running like that for 3 years now.

Are you sure about this? The housing of RHI 5G is no diferent to 4G. I just looked in manual and it says cooling is 'natural convection'. These are IP65 rated so they are completely sealed.

If you can hear something it does not mean that it is a fan making that noise. Mine also makes a noise on full charge but I hear induction coil whine rather than fan and there is good amount of big coils inside so that is not surprising. I find it hard to believe for the fan to be inside sealed system as it neads to have intake and exhaust to be functional. I've seen couple repair videos/photos on Solis and there was no fan in any of them.

Show us some pics, I was thinking the same, how did you mount it?

I have a network cabinet beside the inverter and I placed some 3000rpm 140mm fans inside which keep the gear cool enough during summer but wouldn't hurt to do the same for the inverter.

Are you blowing the air down on it or pulling it up, away from it?

Does hit 60 ish on a day like today but I have an alarm/notification at 70 which it never triggered so far.

I am using Sofar ME3000 with Seplos BMS and it is 100% perfect.

In my opinion, the problem is Eplos BMS. With CAN, the ME3000 becomes a dumb stupid device. It will do what the BMS say to do.

Nice to hear you are on the road to the DIY batteries being up and running. Had few teething problems with mine in first few days but after talking through with seplos engineer on WhatsApp and using a parameter file from him they are working much better now.

I still get the 100% over voltage alarm which triggers my inverter to stop any discharge or solar production for about five mins but at least now the battery sits on standby at that and solar production carries on until I need the battery in evening to discharge. If they could stop the voltage from going to 3.65 and sit sooner at 100% then it would be ideal but no sign of that yet.

I am running v3.00 and yes, General Lithium