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Open Roads Forum  >  Tech Issues

 > Turning off the Charging Process

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capacitor

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Posted: 11/07/20 08:19pm Link  |  Quote  |  Print  |  Notify Moderator

I’m still not following. If you are connected to shore power, turn off the battery isolator. If you are dry camping, you aren’t charging them. If you run the generator, once again isolate the battery. I’m unfamiliar with Li but how do you charge them, wait until it gets warm? When you are driving, the batteries are charging. How do you do that, isolate them?

time2roll

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Posted: 11/07/20 08:21pm Link  |  Quote  |  Print  |  Notify Moderator

What does Battle Born recommend? I thought you could charge them slow so maybe carry a 5 amp charger depending on specification and conditions.


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MEXICOWANDERER

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Posted: 11/08/20 05:47am Link  |  Quote  |  Print  |  Notify Moderator

Some body should ask Deka of they build their arms 100 % in house.

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Posted: 11/08/20 06:23am Link  |  Quote  |  Print  |  Notify Moderator

Battle Born batteries have a built in BMS (Battery Management System) that prevents charging at temps below freezing. No need to disconnect battery. You can still discharge well below freezing.


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jkwilson

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Posted: 11/08/20 08:03am Link  |  Quote  |  Print  |  Notify Moderator

Tom_M wrote:

Battle Born batteries have a built in BMS (Battery Management System) that prevents charging at temps below freezing. No need to disconnect battery. You can still discharge well below freezing.


X2. The whole purpose of the BMS is to keep things from happening to the battery that shouldn’t. A BMS isn’t required to charge a lithium battery. It’s what is needed to make an acceptable lithium battery for use by non-technical consumers.


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Posted: 11/08/20 08:45am Link  |  Quote  |  Print  |  Notify Moderator

Exactly right. You don't need to do anything. If the batteries think they are too cold to charge, they won't charge. It is controlled by the internal BMS.

Also realize it needs to be below 24F for a significant amount of time for the batteries to activate their low temperature charge protection, they have a lot of thermal mass.

jkwilson wrote:

Tom_M wrote:

Battle Born batteries have a built in BMS (Battery Management System) that prevents charging at temps below freezing. No need to disconnect battery. You can still discharge well below freezing.


X2. The whole purpose of the BMS is to keep things from happening to the battery that shouldn’t. A BMS isn’t required to charge a lithium battery. It’s what is needed to make an acceptable lithium battery for use by non-technical consumers.


* This post was edited 11/08/20 08:55am by FWC *

pianotuna

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Posted: 11/08/20 09:10am Link  |  Quote  |  Print  |  Notify Moderator

There are devices that will measure temperature and turn on or off charging.

Of course, SiO2 do not need such devices.


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Posted: 11/08/20 09:34am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

There are devices that will measure temperature and turn on or off charging.

Of course, SiO2 do not need such devices.


OMG!

If you read the OP and the 3 posts above you, they already have lithium batteries, and the batteries have a low temperature cutoff built in.

MEXICOWANDERER

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Posted: 11/08/20 11:34am Link  |  Quote  |  Print  |  Notify Moderator

Pluses then Minuses

Turns out to be negative?

Then the decision to live with the negatives is an obsession not a rational conclusion.

phemens

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Posted: 11/08/20 01:22pm Link  |  Quote  |  Print  |  Notify Moderator

With Lithium you should only be concerned with charging after the thermal mass of the batteries has dropped below the minimum mfg recommended temp - there is no issue with discharging lithiums in cold weather, in fact they generally outperform other technologies in that scenario. For me that's roughly 0C, so I set the limit at 5C to be safe. I installed a waste tank heating pad taped to an aluminum sheet and put that under the batteries. Kicks in at 5C and turns off at 12C, without intervention, but I put in a cutoff switch for warmer weather anyways. Draws about 6 amps per hr. Victron monitor and temp sensor give accurate reading on battery temp and prevent solar from charging below 5C. I am completely off grid and it works great.


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