100AH Lithium Battery £500

[Wissel]

I believe my BMS steps in but this may vary from manufacturer to manufacturer. I have added an accessible fuse to the D+ signal wire which I can easily pull if I ever thought the battery was too cold, just to make sure. I have also put a remote thermometer in the battery compartment but since this is heated, battery temperature is never a problem when the motorhome is in use. When left unoccupied the battery can get cold but it still retains a full useable charge so I would just avoid charging it until everything has warmed up.

Thanks Pausim - sounds like you have a well thought out System

But it's how the one in this post works as a "drop in replacement" I'm curious about. Hopefully BatteryMegaUK will be in later to clarify

 

[BatteryMegaUK]

Is it just me or are others starting to get a little uneasy about the information being posted by BatteryMegaUK?

Ian

Hi Ian,

If you have any questions please fire away, we are here to help give out information particularly in the area of lithium or lead acid. This has been a successful campaign for us and we are almost coming to a close with our lithium competition which I would recommend everyone to join in with!

If there are certain comments you feel uneasy about please question them as we are only here to help!

All the information given is factory recommendations, it’s very clear people are confused about batteries & there are a lot of half truths and misconceptions about lead acid and lithium and different charging systems and wiring, which is why we are trying very hard to sort out do everyone has a clear picture.

To give you an idea we did joint training with Victron energy at a vehicle coach builder/ manufacturers with their experienced tech team.

Not all advice is relevant to everyone so please contact us for specific advice for your system for best practice advice tailored our you just want to clarify some points.

We understand why it’s complicated, these are some snap shots to help regarding lithium-

1. Can’t charge directly with an alternator

2. Can charge with an alternator if B2B or relay ( relay must have a lead acid engine battery) (relays don’t work with regenerative, period)

3. Can only charge between 14.6+-0.2

4. Fully PSOC 5000 plus cycles (lead acid is about 75-100cycles PSOC for a 500cycle Battery)

PSOC = Partial State Of Charge

5. Does not sulphate if not 100% recharged

6. Can’t be damaged by over or under discharge (general use)

7. Does not need a charge for 3 months in storage ( lead acid is 4 weeks)

8. 40% lighter

9. Inbuilt short circuit protection

10. Even power output 100% to 10%

11. Can charge with any charger if 14.6-+ 0.2 which most gel and AGM chargers do

13. Does not gas or leak

15. Nearly Double the usable power of lead acid, 100ah lithium will provided what you would get from 200ah of lead acid.

 

[BatteryMegaUK]

Wasn't really interested to be honest, but you have piqued my interest. On your website your PDF for your batteries, under the heading "Charge Characteristics @0.2C&0.5C, 25℃" Shows a charge starting, albeit slowly, circa 12 VDC but taking the majority of the charge between 12.8 -13.5 VDC with the BMS flat lining around 14.6 VDC

Here is your link:-

Thanks again Eddie! You are writing replies, quicker than we can respond!

Yes again, correct!

TN’s advice is to 100% recharge as often as possible, which is not possible to reach 100% if you don’t have the voltage 14.6-+0.2 and never a mains charge.

It will still work at a slightly lower capacity.

 

[BatteryMegaUK]

BatteryMegaUK - Out of interest, if say 2 of your batteries were connected in parallel, does the BMS do anything to stop the maximum charge rate?

Just wondering as I'm well aware how greedy LiFePo4 can be, and I can't see many motorhomes having alternators or wiring that can deal with a 100Ah draw?

I guess the BMS has some trickery to combat this?

Hi Wissel,

No, you have to size your battery to battery charger in accordance with your batteries maximum current acceptance, details of this can be found on the downloadable PDF file located on our website.

 

[BatteryMegaUK]

Great choice of charger - I have the Votronic VBCS 60/40/430

Part of my reason for choosing this model was the ability to limit charging and not kill my alternator (I have 400Ah LiFePo4 that can charge at 3C - 1200Ah).

Just wondered how the advertised battery protects the alternator without a B2B?

Also, does it have any protection against charging below zero degrees? And if not, what happens if it's a cold winter morning and someone wants to drive?

Hi,

It doesn't, you must use a battery to battery charger. Specifications are no charging below zero degrees.

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[Armytwowheels]

We have ordered two of these batteries, which have arrived at the MiL's, ready for when we get back from our French trip. We have established that our Sterling B2B at 45 ah is compatible, we have 300watts of solar and a votronic 350w, 20amps max, controller. Mains charger is a 30amp CBE 14.6.

So my question is have we got all this right and can we purchase (or we might win) a 3rd battery, can we run 3 in parallel, to give us 300ha at 12v?

 

[Armytwowheels]

So my question is have we got all this right and can we purchase (or we might win) a 3rd battery, can we run 3 in parallel, to give us 300ha at 12v?

BatteryMegaUK are you able to confirm if we can put 3 100ah batts in parallel?

 

[BatteryMegaUK]

BatteryMegaUK are you able to confirm if we can put 3 100ah batts in parallel?

Good Afternoon,

No you cannot run 3 in parallel.

You can run a maximum of 2x batteries in parallel. 4x in series 8x parallel series , this is because the BMS settings are set to two strings for optimum performance.

You can run up to 51.2v in series.

 

[Armytwowheels]

Good Afternoon,

No you cannot run 3 in parallel.

You can run a maximum of 2x batteries in parallel. 4x in series 8x parallel series , this is because the BMS settings are set to two strings for optimum performance.

You can run up to 51.2v in series.

In that case, what is the best way to run more than two, considering the set up I have mentioned in post 186?

 

[PAGR]

In that case, what is the best way to run more than two, considering the set up I have mentioned in post 186?

Hi BatteryMegaUK, I am interested in how to achieve this too. I currently run a bank of four 135Ah batteries and was thinking of upgrading to four of the new lithiums. Is this feasible as a common 12V supply?
As two of my batteries live in an external, underslung locker, an additional concern is how to manage charging in low temperatures.
Peter.

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[BatteryMegaUK]

In that case, what is the best way to run more than two, considering the set up I have mentioned in post 186?

The best way to run more than 2 would be to run 4 in series parallel however this would change your system to 24v.

If you wish to keep your system at 12v the most economical way would be to have 2 separate banks with an isolator switch running before the batteries.

I would however recommend using the batteries first and see how they work for you as you may find you don't need the extra power! As much as we'd like to sell you more batteries!

 

[BatteryMegaUK]

Hi BatteryMegaUK, I am interested in how to achieve this too. I currently run a bank of four 135Ah batteries and was thinking of upgrading to four of the new lithiums. Is this feasible as a common 12V supply?
As two of my batteries live in an external, underslung locker, an additional concern is how to manage charging in low temperatures.
Peter.

Hi,

If you have a bank of four batteries currently, if you are upgrading to lithium you may well find you have enough power with 2.

Please see message above for more info.

As for charging in low temperatures, please see specification sheet below:



Can be discharged in degrees down to -20c but you should not charge back up unless above 0c

 

[Armytwowheels]

Back from France Colin is making a mood board.

Oh no, my mistake, he is getting the van Lithium ready.

 

[JockandRita]

Back from France Colin is making a mood board.
View attachment 321627

Oh no, my mistake, he is getting the van Lithium ready.

View attachment 321631

And a fine job he appears to be making of it too Sandra ............................moody or not.

BTW, as old as it is, I just love our Sterling 12/50 B2B. Yours looks like a more modern model.

Cheers,

Jock.