I am astonished! A factory fitted Lipo without a BMS? What on earth were they thinking or have I misunderstood the situation.
Lithium experts out there...
- Thread starter Peavy
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- Jul 5, 2013
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The Alde boiler is situated in the same under seat locker that the batteries and all controllers are in, which gets warm quickly with the engine heat exchanger. We usually find it warms up the batteries pretty quickly. And we keep the heating on with gas when stopped for the night, so all warm in the morning .That's all well and good Peter, but what are you going to do with not being able to charge your battery when your BMS cuts off any charging and your battery is running out of power when you need it?
You can charge a Lifepo4 battery that's below zero degrees C, but it has to be at a charge rate applicable to the temperature that the battery is at any given time it's being charged, but most BMS's play safe and cut off all charging full stop, understandable as BMS's are pretty dumb and can not control the incoming rate of charge on the fly.
I just leave it to do its own thing and have never had any problem because we make sure that the motorhome is warm when we are using it. I suspect that if the temperature was that cold inside the motorhome overnight SWMBO will have instructed me to find a hotel!!
It will have a bms 100%, but maybe no Bluetooth connectivity, like the ultramax. It’s there inside protecting the cells.
I would certainly hope so. I have managed 6 years of owning a Lipo without having any need of bluetooth connectivity to the BMS or a battery heater. From what I hear some battery heaters are taking more out of the battery than is going in because they are using stored power instead of incoming charge to power the heaters.
Just a quick question to anyone who knows, if using a Victron shunt with a battery temperature sensor would that not reduce the charge rate or turn it off when connected to a Victron b2b set to a lithium profile if the two are connected via the network and temperature drops to zero?
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In a whole Victron integrated system yes, that’s how you tell the chargers to stop charging at 0 degC.
The batt temperature sensor data needs to be fed to a GX or at least Bluetooth ve networked with the charger.
- Jul 5, 2013
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My Victron mains charger and MPPT solar regulator stop the charging altogether at 5 degrees, and don't seem to start again until 8 or 9 degrees. My Votronic B2B and MPPT solar regulator seem to stop closer to zero and start again quicker than the Victron.
Edit. Can't seem to user set the switch off and on temperatures for the Victron mains charger or solar regulator
Two on Tour
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As your shunt and B2B are networked, then you will get a disconnect to the B2B at the temperature you have set in the menu, not aware that the B2B will reduce the charge rate though.
Lenny HB
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If you message RogerIvy he is Off Grid he may be able to sort out shipping.
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Very kind from you, also, thanks
I still have to consider local options and see what's best.
This forum is great
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Thank you Lenny HB. I'll do that also
I did contact them for the MH discount code.
When I have a reply, I'll see what are my options
- Sep 29, 2007
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Hi PeavyThank you Lenny HB. I'll do that also
I did contact them for the MH discount code.
When I have a reply, I'll see what are my options
I'm sure nigelivy will be in touch shortly. We have shipped a number of items to Europe, and he'll be able to advise you on that.
In the meantime I'll create a convo with you.
If you just have a shunt and Orion B2B with a temp sensor, the Orion doesnt take on board the temp data and will keep charging.
Any Smart MPPT chargers will use the temp data on a bluetooth Smart network, so they will stop charging if set to do so.
The new Orion XS 50amp will share and use the temp data, but not the old 30amp or 18amp versions
As Raul says in a full Victron system you can set it up to stop charging below 0degrees C, I do this by pushing the D+ signal through one of the relays in our system that's set to open below 0deg C.
I did also try some very cheap Ali Express temp switches replacing the loop in the green plug - these seemed to work, but I wasn't that confident in them!
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Doh - Below 5 degrees......
- Feb 17, 2014
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I suppose it depends on what the definition of a BMS is. To me, it means under-temperature charge protection. This is the one that's fitted
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The definition of bms is very clear: battery management system, and it can be very basic cell protection with some resistor balance, or, it can be a bms with advanced functions.I suppose it depends on what the definition of a BMS is. To me, it means under-temperature charge protection. This is the one that's fitted
TN Power 60Ah Lithium Leisure Battery LiFePO4 (TN60)
The TN Power TN-LFP12.8V60AH lithium battery utilises lithium iron phosphate technology which produces a significantly better depth of discharge and number of cycles than conventional lead acid batteries. It is also up to 50% lighter than lead acid batteries, completely maintenance free and has...
No bms is the same, some have more abilities then others. But rest assured the very basic bms will be installed to protect under and over voltage cells, with some form of balance.
- Feb 17, 2014
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Agreed, there is a basic BMS but no heater which is my problem.
I did the same but didn't get a reply, then found his reply a few days later in junk, may be worth lookingThank you Lenny HB. I'll do that also
I did contact them for the MH discount code.
When I have a reply, I'll see what are my options
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