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 Post subject: Re: Evbatmon and Phev watchdog is showing the wrong SOH amou
PostPosted: Tue Mar 26, 2019 3:54 pm 
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Joined: Thu Feb 26, 2015 5:58 pm
Posts: 874
Location: Near Port Macquarie Australia
ErwinD wrote:
Tell me if it's not the right place to write this, but I'm new to this forum:

3 days ago, I bought a "demo" (6 months old - 1580 km) belgian 2019 PHEV (2.4 litre) which has a battery pack capacity increased by 10% to 13.8 kWh.
13.8 kWh / 300V = 46 Ah

The watchdog "Battery Condition" is:
95.7% = 42.1 Ah => 100% = 44 Ah (46-44 = 2 = 40-38)

After a full charge, I got the following Watchdog-data:
- Capacity: 110.8% = 42.1 Ah => 100% = 38 Ah (Watchdog uses 38 Ah even for 46 Ah batteries !)
- 100.7% = 42.4 Ah => 100% = 42.1 Ah

What do you think about this numbers ?


Ok ErwinD, I read the battery pack was increased by 15%, from memory, more capacity to 13.8 kWh on the newer PHEVs ie (.15 x 12 kWh) + 12 kWh = 13.8 kWh

Where you say "(Watchdog uses 38 Ah even for 46 Ah batteries !)" it also uses 38 Ah for a 40 Ah rated battery as well!

I will check through your calcs when I get a chance later I hope.

Got to go.

Regards Trex.


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 Post subject: Re: Evbatmon and Phev watchdog is showing the wrong SOH amou
PostPosted: Wed Mar 27, 2019 1:44 am 
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Joined: Mon Mar 25, 2019 11:04 am
Posts: 2
Trex wrote:
Where you say "(Watchdog uses 38 Ah even for 46 Ah batteries !)" it also uses 38 Ah for a 40 Ah rated battery as well!

1. I suppose these 38 Ah are a fixed Watchdog parameter (= not read from the OBD2).
Maybe the Watchdog settings should have a setting "type of battery" = [40 (or 38?)] vs [46 (or 44?)] to give a more significant % (for the cars with an increased battery pack capacity) ?

2. Meanwhile (after 4 days, ± 250 km driving and 1 full charge) the SOH went from 95.7% = 42.1 Ah to 95.5% = 42.0 Ah


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