Using car electric battery

[Vikdikdok]

I’ll start by saying wha I know about electricity would fit on the back of a postage stamp - but here’s my question. . .
could one (or more) of these be used as habitation battery power ?

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- if so how would it be possible (given the weight availability

 

[David and Sally]

No I would say. Wrong voltages and how do you recharge them?

 

[tonyidle]

None are particularly cheap compared with the LIFEPO4 leisure batteries on the market and you'd need substantial technical knowledge to repurpose any of them.

 

[Lenny HB]

Expensive for secondhand batteries, no 12v ones so you would need a voltage converter, then you would need a charger with the correct voltage and profile. You might be able to get a mains charger but without a solar charger & B2B makes them pointless in a Motorhome. Different technology to LIFEPO4 not as safe.

 

[Raul]

Not for 12v systems. Most modules will work fine in 24-48v systems. There is bms adapted for Tesla modules of 24v already.

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[Jimbohorlicks]

The only positive side is that you could plug in to the freebie EV points and get free/ cheap quick charge top ups.

 

[68c]

May be the moho future. Similar battery to tesla but smaller so not so heavy. Charge at EV point, use inverter to run most things on 240v. No more gas hassles. Be used as a power wall rather than a small leisure battery.

 

[poppycamper]

Sorry I can't answer question but what strikes me of the list of batterys you have shown is the range of different voltages different manufactures have.. Did not expect that.

 

[Raul]

They are modules, not full pack. Many modules form a pack. The hole battery will be 400v, while the modules will vary from one manufacturer to another.

 

[autorouter]

May be the moho future. Similar battery to tesla but smaller so not so heavy. Charge at EV point, use inverter to run most things on 240v. No more gas hassles. Be used as a power wall rather than a small leisure battery.

I think that's the future too. When you've got 50kWh of battery storage, the power requirement for the 12V bits is tiny, so could be run from a small 12V voltage converter. Such converters are used in electric cars for their 12V bits, so will no doubt soon be easily available. Recharge in less than 2 hours from a 43kW EV charging point.

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[Pausim]

I suspect the Battery Management Systems (BMS) are built into the cars and not found in the individual battery modules. You would need to find a battery management system as well as a voltage converter. There is also talk of the safer LiFePO4 batteries overetaking the more controversial cobalt types for EV use as their energy density is improving. I wouldn’t want a repurposed EV battery in my motorhome.

 

[Vikdikdok]

Even using 3 or 4 modules would surely provide more than enough 12v power via transformer (?)

 

[Pausim]

Even using 3 or 4 modules would surely provide more than enough 12v power via transformer (?)

Providing enough power isn’t the issue, using it safely is. These things need battery management systems and without a proper set up are potentially very dangerous. In my opinion it is not something to mess with unless you know what you are doing. A simple transformer is not going to work.

 

[autorouter]

I suspect the Battery Management Systems (BMS) are built into the cars and not found in the individual battery modules. You would need to find a battery management system as well as a voltage converter

Motor manufacturers don't usually build their electrical systems, they buy them in from the likes of Bosch and TRW. Probably customised for the model is is used for. If prevented from acquiring or using the battery ancillary units, I'm sure third party versions will become available. As with any energy store (diesel, LPG, Lithium-ion) it's a good idea to know what you are doing when installing custom systems.

 

[jongood]

Not for 12v systems. Most modules will work fine in 24-48v systems. There is bms adapted for Tesla modules of 24v already.

As I've already got 24v and 12 v systems. Could I replace chassis battery with a tesla module and use a 24-12 B2B ?

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[Gromett]

I’ll start by saying wha I know about electricity would fit on the back of a postage stamp - but here’s my question. . .
could one (or more) of these be used as habitation battery power ?

Electric Car Batteries FOR SALE - EV Modules & Batteries

Second Life Electric Car Batteries from Tesla, VW ID, Jaguar ipace modules from Used EV Packs

www.secondlife-evbatteries.com

- if so how would it be possible (given the weight availability

Yes you could use them as a leisure battery BUT you would need to additional work, they wouldn't be just drop in replacements.

That said these won't be LiFEPO4 so are going to be more prone to fire risk if mis-handled. I wouldn't risk it.

You would need to build a BMS for these batteries, then install a voltage converter. Charging up from the alternator would be tricky but again doable.

Not worth the work/hassle in my view.

The other option would be to split the packs down to individual cells then make up your packs from the cells. (although I do note they sell the odd cell on their own)

 

[Gromett]

This is the only one on that list that seems good value for a leisure battery. 4 of these in series would make a half decent pack.

<Broken link removed>

 

[Pausim]

As I've already got 24v and 12 v systems. Could I replace chassis battery with a tesla module and use a 24-12 B2B ?

I don’t think a B2B would be a replacement for a BMS. Also the standard B2B Li profile will be set up for LiFePO4 and might not be suitable for the other Li chemistries often found in older EV batteries.

 

[jongood]

I don’t think a B2B would be a replacement for a BMS. Also the standard B2B Li profile will be set up for LiFePO4 and might not be suitable for the other Li chemistries often found in older EV batteries.

The 24v alternator would be charging the tesla module, the b2b would to get the chaŕges into the house batteries which would effectively become slaves. I might need to get a smart 24v alternator though?

 

[Pausim]

The 24v alternator would be charging the tesla module, the b2b would to get the chaŕges into the house batteries which would effectively become slaves. I might need to get a smart 24v alternator though?

Does the Tesla module come with a BMS or can you source one?

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[Raul]

Does the Tesla module come with a BMS or can you source one?

Yes there is one available in USA, can coms, specifically designed for Tesla NMC modules, it’s on open source.

 

[Raul]

As I've already got 24v and 12 v systems. Could I replace chassis battery with a tesla module and use a 24-12 B2B ?

Not a chance, I would not have NMC on a chassis, when lfp is abundant and competitive. For fixed installation yes I would have two modules in series for 48v system. And will take some doing to get the temp control and bms coms with the rest of the hardware.

 

[Vikdikdok]

Ho hum . . . It was only a passing thought