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Seplos Mason DIY Kit - Ancillaries - Advice

 
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Last Post by MisterB 2 months ago
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 HughF
(@hughf)
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2918 kWhs
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20/12/2023 11:04 am  

@makia2023 I hooked up the cell monitoring lines before connecting the B+ cable (circled red) from the pack to the BMS. After about 2 mins I noticed the telltale smell of hot conformal coating coming from the area around the balance resistors (circled green).

Seplos V3 has the shunts in the -ve bus, unlike V2 which had a separate shunt onboard in the +ve bus, hence the need for a bat+ sense wire.

The BMS powers up fine but it reads 0mV for all the cell voltages. It reads the pack voltage correctly however.

I think I'll order a replacement from fogstar, I could swap my batrium over from my 9.6kWh pack, but it's very much not reliable, and it would be some work to make it all fit.

615Xi vKjbL. AC SL1040

 

Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.

My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.


   
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Transparent
 Transparent
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20/12/2023 11:08 am  

@hughf - balance resistors ... in an active balancer model?

What are they doing there?

Save energy... recycle electrons!


   
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 HughF
(@hughf)
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20/12/2023 11:13 am  

@transparent The seplos v3 is the standard passive balancing BMS, their 'active balancer' is a separate unit that connects via an additional harness, directly to the cells. It is non-programmable, and works at any cell voltage >3V, when there is a 50mV delta.

It's generally considered to be 'a bit junk', as it's not programmable and can't be enabled only at >3.45V/cell.

Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.

My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.


   
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 Makia2023
(@makia2023)
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Posts: 72
Topic starter 20/12/2023 1:24 pm  

@misterb Ive got a 60w tube heater hooked up to a temp control plug. I will insulate and keep at around 18 C over winter.


   
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 MisterB
(@misterb)
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Posts: 139
20/12/2023 2:01 pm  

@Transparent - as it will be set low AND should be fed using the electricity from the battery, then i thought it was a reasonable option, especially if i insulated the heating pad and rear of the Seplos with a couple of inches of celotex or similar.

 

@Makia2023 - i did consider something similar but decided against it as i wanted to stop the battery from dropping below charging levels, as opposed to heating the immediate are its in.

 

 


   
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 HughF
(@hughf)
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21/12/2023 6:32 pm  

New bms delivered today from fogstar, all installed and up and running 👍

 

Now to find that 3kW charger I’ve got somewhere….

This post was modified 5 months ago by HughF

Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.

My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.


   
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 Makia2023
(@makia2023)
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401 kWhs
Joined: 8 months ago
Posts: 72
Topic starter 21/12/2023 6:51 pm  
IMG20231221184750

Installed and working.....but CT clamp isn't registering !!!!


   
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Transparent
 Transparent
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21/12/2023 7:41 pm  

Expand that comment please @makia2023

The full SunSynk diagram of all possible configurations has three CTs on it. 🙄 

I'm going to assume that you're referring to the one which connects to positions 5 & 6 on the Inverter, and has the clamp/transformer around the live feed wire between the inverter and its mcb-trip in your consumer unit.
In the manual, you probably have this diagram, and will have read the comments below and to the right:

image

See also the table at the bottom of the following page.
Although it's beneath the diagram which covers installation in the USA, it's still relevant.

image

What reading do you get if you disconnect the CT-clamp wires from the inverter, and use a multimeter set to ohms?

Save energy... recycle electrons!


   
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 Makia2023
(@makia2023)
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Posts: 72
Topic starter 21/12/2023 7:55 pm  

@transparent i appear to have put my multimeter somewhere safe.......


   
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 Transparent
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21/12/2023 8:06 pm  

Having more than one multimeter would seem a prudent investment for someone who's just imported 64 lithium cells from China!

I have three multimeters, one 'mains tester' box and an assortment of dedicated current/voltage meters.
And yes, I have needed to use all of them simultaneously on one occasion!

I've just checked online, and Amazon have at least 50 multimeter models, auto-ranging, at less than £30 and available for delivery on Saturday!
Give yourself an 'essential' Christmas present.

Save energy... recycle electrons!


   
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 Makia2023
(@makia2023)
Estimable Member Member
401 kWhs
Joined: 8 months ago
Posts: 72
Topic starter 21/12/2023 8:08 pm  

I have a spare. I'm getting no reading from either my old or new ct clamp with it. Any thoughts?


   
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 Makia2023
(@makia2023)
Estimable Member Member
401 kWhs
Joined: 8 months ago
Posts: 72
Topic starter 21/12/2023 8:10 pm  

I'm tempted to run another cat 6 cable separately and see if that works. But will be a tomorrow thing. I'm stumped.

It should definitely see the grid load regardless of battery system/solar right?


   
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