question

Tom Ranson avatar image
Tom Ranson asked

Multiplus ii and MPPT chargers low temperature cut off for LiFePo4

Hi all,


I can't seem to find the answer to this on the forums or elsewhere.


I am planning to install LiFePo4 batteries for my existing Multiplus ii and 30/100 MPPT's. The batteries I am considering (Ultramax) do not have low temperature cut off built into their BMS.


I believe that the MPPT's can be configured with low temperature cut off when used with a Smart Battery Sense. This seems easy enough to configure.


But what about the Multiplus ii? I can't find out how to achieve this.

Multiplus-IIMPPT Controllers
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

2 Answers
xavier-64 avatar image
xavier-64 answered ·

The best is to place a battery sensor on the battery with the Multiplus temp sensor input.

Xavier

1 comment
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Tom Ranson avatar image Tom Ranson commented ·
@xavier-64 yep, I already have the included temperature sensor installed. I was struggling to find the option on the Multiplus to configure the low temperature cut off.
0 Likes 0 ·
klim8skeptic avatar image
klim8skeptic answered ·

You have a Cerbo?

Have a read of the DVCC manual , you can use STS to share temperature data between devices. Set your chargers to disable charge below 5c.

SVS and SCS might be useful also.

5 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Tom Ranson avatar image Tom Ranson commented ·
@klim8skeptic Yep, have a Cerbo. Already have DVCC configured with STS, SVS and SCS enabled.


But how to I enable the low temperature cut off on the Multiplus? It's quite obvious on the MPPT's.


Oh, wait- I think I've found the setting in Ve.Config, on the charger tab.


Presumably I have to configure low temperature cut off on both the MP and all the MPPT's separately.


Is there any advantage to having a Smart Battery Sense networked to the MPPT'S, or does STS (plus SVS, SCS) just take care of this using the temp sensor wired to the MP?

0 Likes 0 ·
Show more comments