How to wake up a lithium battery!
- Thread starter Gerry77
- Start date
- Feb 18, 2009
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- Funster No
- 5,677
- MH
- Malibu T410
- Exp
- Since August 2008
Gentle shake and a nice cup of tea -
Sorry no idea atall - but someone will
Sorry no idea atall - but someone will
Sorry I'm confused, if you read 13.1-13.5v the bms IS awake, and working.
Bluetooth disappearance is another matter, it could just be dud chip and never to recover. Bluetooth chips comes with 1-3 year warranty even if battery has 10 year.
Have you tried Roamer themselves?
Bluetooth disappearance is another matter, it could just be dud chip and never to recover. Bluetooth chips comes with 1-3 year warranty even if battery has 10 year.
Have you tried Roamer themselves?
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OP
OP
Sorry I should have been clearer. The voltage reading is via a multimeter on the terminals.
I have tried Roamer but they answered previous questions but as I am not the original purchaser they are not as helpful regarding the BMS unfortunately.
If it takes charge and discharges ok, then the bms has no fault. The bluetooth may be reset by disconnecting power to it internally. That involves opening the box, and removing the negative feed to the bms from first cell, battery side.
To wake up a bms, works with a multimeter set on diode, and put the positive side of the meter on the load side of negative bms and negative side of meter to the battery side of negative bms. This works on all bms without a switch. Thats how I turn on all JK bms without a switch.
Note, when you turn on or wake up any bms, no load allowed at that time.
To wake up a bms, works with a multimeter set on diode, and put the positive side of the meter on the load side of negative bms and negative side of meter to the battery side of negative bms. This works on all bms without a switch. Thats how I turn on all JK bms without a switch.
Note, when you turn on or wake up any bms, no load allowed at that time.
OP
OP
Thanks Raul.
Will investigate.
- Mar 14, 2020
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- MH
- Autotrail Cheyenne
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- Since 2015, still learning
This should be a pinned post!
OP
OP
I contacted Roamer again and had a response. They suggest charging it up to 14.2volts and then it should register 13.5-13.6v after a few hours. Hopefully that may wake up the BMS otherwise it’s the BMS at fault.
Will put it on charge on Wednesday when I’m in all day so I can keep an eye on it.
Will put it on charge on Wednesday when I’m in all day so I can keep an eye on it.
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MichaelT
LIFE MEMBER
I thought if you put a load on the battery it will wake it up but has to be a decent load not a small bulb or similar.
Can you clarify if the battery terminal readings were taken with the battery disconnected from everything? If the BMS has shut off, then if for example it's still connected to a solar controller then the battery terminals will read whatever the solar controller is putting out, even if the BMS has shut off.
OP
OP
Readings were taken with multimeter and the battery was not connected to anything at all just sitting on the bench.
You need to prove charging and discharging works. Put the multimeter on the terminals, then attach a charger to it, while you observe the voltage. If voltage rises it takes charge, if you have a clamp meter, on the charger lead, you can see the amps. Thats a sure way to prove charging is enabled.
Discharging, just attach a car bulb or anything 12v and see if it works, also you can measure the current again, or watch the voltage on discharge.
OP
OP
I connected two fog lights up and they worked fine, left them on for a couple of hours and the battery voltage barely dropped.
Will be on charge tomorrow.
Will be on charge tomorrow.
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- Apr 6, 2019
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- FourWinds Windsport 6.8L V10
I had a sleeping Fogstar after winter due to low power (my error).
It didn't want to wake at first until I started the engine and it was receiving 40 to 50 Amps from the engine and after maybe 15 seconds woke up.
It didn't want to wake at first until I started the engine and it was receiving 40 to 50 Amps from the engine and after maybe 15 seconds woke up.
OP
OP
Well, I have charged it up today now registering 14.2v on terminals with a multimeter. I will checked again this evening and see what it is registering then. Still no sign of the BMS nothing showing on the app (yet) !
Can you try a different phone? Or delete the app, and re install it.
Does it not pick it up on bluetooth pairing?
OP
OP
Checked voltage today after charging to 14.2v and it’s at 13.6v with nothing connected to it .
Have deleted the Roamer app and reinstalled it but BMS not found. I have just invested in a Victron smart shunt so when I reinstall the battery I will have a better understanding of the battery.
Have deleted the Roamer app and reinstalled it but BMS not found. I have just invested in a Victron smart shunt so when I reinstall the battery I will have a better understanding of the battery.
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OP
OP
Thanks to you all that replied and I plan to remove the 10yr old AGM and change for the lithium.
I already have fitted 470 watts of solar with Votronic MPPT, Victron IP22 mains charger and Victron B2B together with a Victron smart shunt.
I must remember to remove the EBL charging fuse though.
I hope that will give me enough power.
I already have fitted 470 watts of solar with Votronic MPPT, Victron IP22 mains charger and Victron B2B together with a Victron smart shunt.
I must remember to remove the EBL charging fuse though.
I hope that will give me enough power.
- Sep 22, 2017
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What is a 'BMS' ? or, an 'EBL' for that matter?
OP
OP
EBL is an electroblok what Hymers have to control the electrical system.
BMS is a Battery management system, it controls lithium batteries in particular relating to voltage, charging and temperature.
BMS is a Battery management system, it controls lithium batteries in particular relating to voltage, charging and temperature.
What is a 'BMS' ? or, an 'EBL' for that matter?
OP
OP
I have just been out and checked the Roamer battery voltage with a meter and also tried the BMS and it’s now woken up.
MichaelT
LIFE MEMBER
Still fit the shunt as it's more accurate.
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In most motorhomes there is a box that houses the 12V fuses for the habitation area, and also contains relays that switch the 12V power depending on whether the engine is running or the mains power is plugged in. That distribution/fusebox is made by different specialist manufacturers like Sargent, CBE, Nordelettronica, BCA and Schaudt/Lippert. If it's made by Lippert it will be called an Electroblock, with a number, such as EBL 101. Other manufaturers call these boxes Power Distribution Units (PDU) or Power Supply Units (PSU). Some people seem to refer to any make of PDU as an EBL, even if it's not a Schaudt/Lippert product.
The PDU/EBL usually has a data wire leading to a display/control panel in the living area, so the user can monitor and control the 12V devices.
OP
OP
It’s already fitted just need to lift out 25kgs of old battery and replace with 10kgs!
Silly question have you downloaded the right app? If so put your phone near the battery and press scan ? I use a victron 230v charger never had a problem. Ring Elliot at roamer id be suprised if wasn’t helpful?
OP
OP
Sorted now as my earlier post. I have already been in touch with Elliott who has responded to my emails.
Hi Gerry77, I have fitted a Victron solar charger and a B2B plus a smart shunt but not a Victron mains charger, I am interested to know why you have to remove the EBL charging fuse as I have not done that, do you think I should and what happens if I dont.
Jack
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