TN POWER LITHIUM BATTERIES
- Thread starter Youlostoo
- Start date
Never looked into most of it but I can tell you a 0.2C charge rate is 0.2 x battery capacity. So a 100 Ah battery could be charged safely at 100 x 0.2 = 20A charge rate.
- Oct 12, 2009
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While we are on Lithium has anyone had an insurance company ask about types of batteries, and if Lithium have they refused insurance or asked additional premium?
I am asking as a result of reports of some fires caused by them.
Geoff
I am asking as a result of reports of some fires caused by them.
Geoff
Coolcats
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If there was a fire I suspect the insurance company would want to know who installed them and did it have an appropriate charging system.
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cmcardle75
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Er, that is maximum charge rate. If your maximum rate on the battery is 20A, your 30A Victron will need to be reined in. You are confused, because a max discharge rate will be in A, not Ah.
There are many variants of Lithium batteries. All of them are 'Lithium-ion'. However one variant, Lithium Iron Phosphate (LiFePO4) is sometimes called Lithium Iron, which is a source of confusion.
Leisure batteries for motorhomes are always LiFePO4, which is inherently safer than other Lithium types. LiFePO4 does not catch fire when damaged or punctured, like other lithium types. The batteries in mobile phones, laptops and Tesla cars are the spontaneously combustible type,which is why insurance companies get nervous about lithium batteries.
LiFePO4 are probably as safe as lead acid and are not filled with highly concentrated sulphuric acid.
andy63
Free Member
I downloaded the fact sheet for the 110ah battery.. ill try and attach the link...
its the one that will fit in the seat plinth of the transit base..the 100ah was touch and go on height..so I got the 110ah..
its the one that will fit in the seat plinth of the transit base..the 100ah was touch and go on height..so I got the 110ah..
The 110Ah battery has a capacity of 110 amp-hours. Its recommended charge/discharge amps is 21.6amps. If you round that up to 22 amps, you see that 22 is 1/5 of the capacity 110Ah. 1/5 is .2. Because this figure of 1/5 applies to all sizes of battery of that type, they call the capacity C, and the charge/discharge current .2C.
They conduct tests with charge/discharge currents of 21.6A for this battery. Its capacity is 110Ah, so if we call the current 22A for simplicity, it will supply 22A for 5 hours. However they say that you can take a continuous current of 100A from the battery, but this can only be supplied for 110/100 = 1.1 hours. They say a pulse current of up to 200A is permissible, for the starting surge of an inverter for example.
For charging, the recommended current is 21.6A, but up to 54A is permitted, so your Victron 30A B2B is within that limit.
They conduct tests with charge/discharge currents of 21.6A for this battery. Its capacity is 110Ah, so if we call the current 22A for simplicity, it will supply 22A for 5 hours. However they say that you can take a continuous current of 100A from the battery, but this can only be supplied for 110/100 = 1.1 hours. They say a pulse current of up to 200A is permissible, for the starting surge of an inverter for example.
For charging, the recommended current is 21.6A, but up to 54A is permitted, so your Victron 30A B2B is within that limit.
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andy63
Free Member
Just add that with the tn batteries you can have two in parallel or up to 4 in series.. 
Andy
Andy
0.2 C charge rate seems very low but this may just be so that they can claim more recharge cycles. I think it has cylindrical cells which are said to be better than prismatic ones.
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