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12v Horse Lorry Replacement Pack
#1
Hi All

My wife has seen me messing around with cells for a couple of years now and has decided I need to do something for her now.

She has a horse lorry with a 12v leisure battery system with an inverter and solar panels on the roof. On occasion she can run out of power due to our lovely Scottish weather (no sun) so I am planning to replace the leisure battery with a bigger 18650 pack consisting of approx 360 cells. Basically the questions are...

Do I go for a 3s or 4s pack?
Any suggestions for a BMS as there could be a potential 100A draw on the pack for short periods?
Anything else I can do to minimise the chances of setting her truck on fire!

The inverter/charge is this device which is installed already...https://voltaconsolar.com/off-grid/12v-off-grid-inverter-charger/conversol-1500va-12v-inverter-charger-mppt.html

Thanks for any help.

Cheers
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#2
Go with LiFePO4 cells to make things a LOT easier to size. They can directly replace lead acid without over-charging. They also can handle higher amp draw
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#3
(06-25-2019, 10:56 PM)Korishan Wrote: Go with LiFePO4 cells to make things a LOT easier to size. They can directly replace lead acid without over-charging. They also can handle higher amp draw

Thanks for the reply however 18650's is what I've got unfortunately. Lots of them.
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#4
If you can't switch over, then it'd be best to go with 4s. It's easier to bring the voltage down than trying to bring it up.

What all do you need to run off battery? I'm not sure exactly what "horse lorry" your wife has. There's lots of results for "lorry" Wink

If this is like a golf cart type device, then 16V for an electric motor isn't going to hurt it. It will actually run a little more efficient than at 14V because it'll pull less amps, therefore less heat generation/wasted.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
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#5
18650 is not a chemistry. LiFePo4 exist in that form factor tio.

I also vote LiFe cells. LiIon doesnt Play well with 12v depending on system.
How do you charge?
What Will it Power?

Korishan higher voltage and less current doesnt automatically mean less wasted energy.... Also IF There is a motorcontroller between that might blow Up over 15v. Unknown factors Wink
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#6
I'd go 4s, 12V control electronics can be run from a buck regulator & motor current controlled via a decent PWM contoller
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