Low Temp Charging Cut-off with Victron equipment

[sgprice]

STILL in the process of finalizing some of the parts for a 24V system (in addition the OEM 12v) and then working up some templates to figure out where it will all go (want to put it all in the front bay hold beheld the wall where the stairs and plumbing are).

I have a VE MultiPlus-II 24/3000/70-50 2 X 120V that I will be using with 24V 200-230Ah form LiFePO4 batteries.

Looking at LiTime's 24V batteries for the project (due to the price and reviews) but they do not have a Low Temp Cut-Off on the BMS, nor self heating.

My question is - can you program a Low Temp Charging Cut-Off into the VE MultiPlus-II like above (as well as their Solar Chargers; will be using 1-2 on the next phase of this project)? I thought I had read somewhere you could do this but have not found the set up or programming required in the V.E. manuals, etc. All I have been able to find is Temp Compensation settings.

If you have had success doing above please also tell me what equipment you used to let the VE Chargers know what the battery bank system temps are (I will be installing a Cerbo GX and BT Dongle).

AND Yes, If I install this battery bank in the heated hold I probably will never need Low Temp Cut-Off, or heated batteries. But if I can automate this I would feel much better about the investment in the batteries I will be making (like when we store the 5th wheel in the future and I forget to turn of the Solar or Multiplus Charging...)


Thank you.

[Soundsailor]

STILL in the process of finalizing some of the parts for a 24V system (in addition the OEM 12v) and then working up some templates to figure out where it will all go (want to put it all in the front bay hold beheld the wall where the stairs and plumbing are).

I have a VE MultiPlus-II 24/3000/70-50 2 X 120V that I will be using with 24V 200-230Ah form LiFePO4 batteries.

Looking at LiTime's 24V batteries for the project (due to the price and reviews) but they do not have a Low Temp Cut-Off on the BMS, nor self heating.

My question is - can you program a Low Temp Charging Cut-Off into the VE MultiPlus-II like above (as well as their Solar Chargers; will be using 1-2 on the next phase of this project)? I thought I had read somewhere you could do this but have not found the set up or programming required in the V.E. manuals, etc. All I have been able to find is Temp Compensation settings.

If you have had success doing above please also tell me what equipment you used to let the VE Chargers know what the battery bank system temps are (I will be installing a Cerbo GX and BT Dongle).

AND Yes, If I install this battery bank in the heated hold I probably will never need Low Temp Cut-Off, or heated batteries. But if I can automate this I would feel much better about the investment in the batteries I will be making (like when we store the 5th wheel in the future and I forget to turn of the Solar or Multiplus Charging...)


Thank you.

Not sure if this (https://www.amazon.com/gp/product/B07RTYGMBD) would work with the Multiplus. I'm planning on installing it with my Victron solar controller.

[BoredWeasel]

the issue with using the victron to control your battery charge cut off is the location of the temperature sensor. the sensor needs to be located with the batterys.

I have run into the chargers being in an unheated space and refusing to charge a battery which was in a heated space and safe to charge.

[sgprice]

the issue with using the victron to control your battery charge cut off is the location of the temperature sensor. the sensor needs to be located with the batterys.

I have run into the chargers being in an unheated space and refusing to charge a battery which was in a heated space and safe to charge.

If I find I can use the VE equipment to cut off charging at low temps I will be using a VE Temp sensor that connects to the battery bank.

[powerscol]

STILL in the process of finalizing some of the parts for a 24V system (in addition the OEM 12v) and then working up some templates to figure out where it will all go (want to put it all in the front bay hold beheld the wall where the stairs and plumbing are).

I have a VE MultiPlus-II 24/3000/70-50 2 X 120V that I will be using with 24V 200-230Ah form LiFePO4 batteries.

Looking at LiTime's 24V batteries for the project (due to the price and reviews) but they do not have a Low Temp Cut-Off on the BMS, nor self heating.

My question is - can you program a Low Temp Charging Cut-Off into the VE MultiPlus-II like above (as well as their Solar Chargers; will be using 1-2 on the next phase of this project)? I thought I had read somewhere you could do this but have not found the set up or programming required in the V.E. manuals, etc. All I have been able to find is Temp Compensation settings.

If you have had success doing above please also tell me what equipment you used to let the VE Chargers know what the battery bank system temps are (I will be installing a Cerbo GX and BT Dongle).

AND Yes, If I install this battery bank in the heated hold I probably will never need Low Temp Cut-Off, or heated batteries. But if I can automate this I would feel much better about the investment in the batteries I will be making (like when we store the 5th wheel in the future and I forget to turn of the Solar or Multiplus Charging...)


Thank you.

Yes it can be done both with the multiplus and the MPPT smart controllers. both allow for the connection of temp sensors. You will need a way to access the multiplus program. I use a laptop and the MK3-USB connection https://www.victronenergy.com/access...erface-mk3-usb Of course you will need to download the correct Victron Connect app.

If you need the how to details (I am not one that knows) take a look at the GD Technical forum on the main GD web site under customer support. There are a few gurus that can walk you through. In fact I think there is a thread on the how to there. If I could, I would post the link, but I don't want to brake the rules here Victron Energy also has a web page and FAQ center to find how to details.

Good luck on your project..BTW the LI Time batterys has good reviews. Will Prowse likes them too.

[sgprice]

Yes it can be done both with the multiplus and the MPPT smart controllers. both allow for the connection of temp sensors. You will need a way to access the multiplus program. I use a laptop and the MK3-USB connection https://www.victronenergy.com/access...erface-mk3-usb Of course you will need to download the correct Victron Connect app.

If you need the how to details (I am not one that knows) take a look at the GD Technical forum on the main GD web site under customer support. There are a few gurus that can walk you through. In fact I think there is a thread on the how to there. If I could, I would post the link, but I don't want to brake the rules here Victron Energy also has a web page and FAQ center to find how to details.

Good luck on your project..BTW the LI Time batterys has good reviews. Will Prowse likes them too.

Good to know! Thanks for the info powerscol

[powerscol]

Good to know! Thanks for the info powerscol

No worries. I had researched this a while back for when I convert to lithium. When I switch to LI Time (have 4 6V flooded right now) I will be building a storage box with heating pads. That way I don't need to worry about low temp charging. Battery's will be in the unheated front bay. However Li Time is now installing low temp charging protection on a lot of thier batterys now.

I will be sticking with 12V, Going 24V boggles my mind trying to figure how your wire to deliver 12V to the distribution panel.

If you figure this out, could you please post back on the how to details.

Merry Christmas

[sgprice]

No worries. I had researched this a while back for when I convert to lithium. When I switch to LI Time (have 4 6V flooded right now) I will be building a storage box with heating pads. That way I don't need to worry about low temp charging. Battery's will be in the unheated front bay. However Li Time is now installing low temp charging protection on a lot of thier batterys now.

I will be sticking with 12V, Going 24V boggles my mind trying to figure how your wire to deliver 12V to the distribution panel.

If you figure this out, could you please post back on the how to details.

Merry Christmas

Although it does complicate things a bit, having a 24v (or 48v) system powering a 12v system is not difficult (thanks to many posts and PM's with David of SolarPoweredRV). You leave your 12v battery bank in place and using a 24v to 12v DC to DC Converter, charge the 12v system via that.

See SolarPoweredRV's post on the following thread (see post #10 ) - https://www.mygrandrv.com/forum/show...2V-DC-question

I like that I can have more energy in a smaller space (battery bank), smaller wiring, and more consistent DC power on the 12v side.

[powerscol]

Although it does complicate things a bit, having a 24v (or 48v) system powering a 12v system is not difficult (thanks to many posts and PM's with David of SolarPoweredRV). You leave your 12v battery bank in place and using a 24v to 12v DC to DC Converter, charge the 12v system via that.

See SolarPoweredRV's post on the following thread (see post #10 ) - https://www.mygrandrv.com/forum/show...2V-DC-question

I like that I can have more energy in a smaller space (battery bank), smaller wiring, and more consistent DC power on the 12v side.

Do you have a Cerbo GX in your system. It has ports on the back side for temp sensors and has programmable relays (6A) max to operate the pads or fans, or whatever you want to connect. That is the easiest way to do what you want. The MPPT controller can be programed to not provide power based on temp and the Multiplus can be programed to no charge based on temps, but to fire heaters you need the Cerbo GX or possibly other GX devices.

Hope this helps.

[kb0zke]

Hmmm, this might be something for me to check into. I'm also putting in two 24 V 200AH batteries and a MultiPlus II. All of my equipment will be in the pass-through below the front closet, so batteries and MultiPlus II will have the same air temperature around them. I have the side and back panels off of the Nautilus system and noticed that there is an air duct in that space. I'm tempted to install a grill in the wall to allow some of that heat into the bay.