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Last Post by Bash 1 month ago
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 swwils
(@swwils)
Estimable Member Member
Joined: 5 months ago
Posts: 81
04/01/2026 5:08 pm  

@transparent some inverters implementation of the various protocols is also broken too. 

At the end of the day these are all just uarts and serial, so by pure luck sometimes you can pull out the messages you need. 

I don't think it's gunna be standardised properly anytime soon. 



   
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Batpred
 Batpred
(@batpred)
Noble Member Member
Joined: 1 year ago
Posts: 660
04/01/2026 6:18 pm  

Posted by: @transparent
↑

Posted by: @batpred
↑

In the diagram below, I describe my understanding of the comms connections @bash described, which assumes that the BMSs on each battery can be made to work together (a basic way being that they are all the same SEPLOS model, with the same firmware installed). 

 

image

 

My question is of course, why would the daisy chaining of BMS comms not work with other BMS models?

You've mixed software and hardware concepts within the same question, making it unanswerable.

Yes, you can have multiple BMS units connected to the same RS485 bus, with the Inverter acting as the Master.

Either the inverter must be able to support different Modbus variants simultaneously,
or else the BMS units would all need to be of the same type (eg from the same manufacturer).

You can't just make all the physical connections and then expect the inverter to sort it out for you!

I love diagrams. Even if more detailed, they would never be really right. Still,  they make a huge difference to ground a discussion on the key aspects! 

Solis menus imply the inverter is only meant to work with one BMS from one battery manufacturer. And Seplos is not included (my third reason to want a different BMS). 

I will ask Solis and post any answers in the Inverter thread

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kw export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
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 Bash
(@bash)
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Joined: 4 months ago
Posts: 132
04/01/2026 7:55 pm  

@swwils 

Definitely for the money I think Fogstar are almost impossible to beat in the UK, certainly without taking an unnecessary risks for a (potential) small saving with an unknown supplier or importing yourself.



   
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Batpred
 Batpred
(@batpred)
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Joined: 1 year ago
Posts: 660
04/01/2026 9:21 pm  

@swwils 

I agree, paying more for Frogstar does not guarantee the firmware on the BMS will work smoothly. 

Whenever I had issues, their answer was often that I may have not installed it correctly. 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kw export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
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Batpred
 Batpred
(@batpred)
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Joined: 1 year ago
Posts: 660
04/01/2026 9:27 pm  

Posted by: @bash
↑

Definitely for the money I think Fogstar are almost impossible to beat in the UK, certainly without taking an unnecessary risks for a (potential) small saving with an unknown supplier or importing yourself.

Fogstar sell ready made kits for over £2k.

The ebay links I shared are ready made batteries from the UK for £1k. They have been beaten already in the UK!  🤣

A fan club here up will not help to get them to catch up.   

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kw export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
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Jancold
 Jancold
(@jancold)
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Joined: 3 years ago
Posts: 163
04/01/2026 9:33 pm  

@batpred Er sorry all your links to these cheap batteries are ended, sold out or not found.


Daikin 6Kw ASHP.
MG4 EV, Solis 8KW inverter, 32KWh battery
1926 Semi with loft and wall cavity insulation, all radiator.


   
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 Bash
(@bash)
Reputable Member Member
Joined: 4 months ago
Posts: 132
04/01/2026 10:43 pm  

@batpred 

It's a shame you haven't bought any of these cheap batteries so that we could find out some more information about them.

Hopefully you will buy some soon and update the forum with your experience, as it would be great to find some better value batteries to consider.



   
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Batpred
 Batpred
(@batpred)
Noble Member Member
Joined: 1 year ago
Posts: 660
05/01/2026 9:43 am  

Posted by: @jancold
↑

@batpred Er sorry all your links to these cheap batteries are ended, sold out or not found.

Please post new links, it will help others. The ones I posted are business sellers. 

Ebay keeps the links available until the stock sells. Sometimes sellers create new listings even when they have more stock of the same available.  

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kw export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
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Batpred
 Batpred
(@batpred)
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Joined: 1 year ago
Posts: 660
05/01/2026 9:45 am  

aliexpress seems to have even better options. Personally I only used it for lower value items and had no issues.


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kw export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
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Transparent
 Transparent
(@transparent)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 3027
05/01/2026 11:02 am  

Posted by: @batpred
↑

Please post new links, it will help others.

Erm... how can @jancold post new links?

It's you @batpred , who is doing the research into cheaper storage batteries from online sellers.

Isn't it the case that you're comparing Chinese-based manufacturers such as Datou Boss?

But how are you assessing the compatibility of their integral BMS with your existing Fogstar/Seplos battery and your Seplos inverter?


Save energy... recycle electrons!


   
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Batpred
 Batpred
(@batpred)
Noble Member Member
Joined: 1 year ago
Posts: 660
05/01/2026 6:12 pm  

Posted by: @transparent
↑

Posted by: @batpred
↑

Please post new links, it will help others.

Erm... how can @jancold post new links?

It's you @batpred , who is doing the research into cheaper storage batteries from online sellers.

ermm.. I do not have a monopoly on helping others to save money...   

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kw export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
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 Bash
(@bash)
Reputable Member Member
Joined: 4 months ago
Posts: 132
05/01/2026 10:05 pm  

@batpred 

In all fairness you haven't provided any help at all, just links to some unknown and untested batteries from a random eBay account.

It would have been more useful to have given first hand information on these cheap batteries, but unfortunately although you seem to think they are the way forward, you haven't bought any yourself.

Please do though report back on your findings when you have bought some.


This post was modified 2 months ago by Bash

   
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