# 3xMulti plus 8xMPPT plus 2xDIY batteries - setup for voltages (bulk, absorption, float) **URL:** \ **Category:** DIY\ **Tags:** 3-phase, parallel, multiplus-ii, ess, diy\ **Created:** [7 October 2024 20:25 UTC](https://community.victronenergy.com/t/3xmulti-plus-8xmppt-plus-2xdiy-batteries-setup-for-voltages-bulk-absorption-float/6758 "2024-10-07T20:25:55Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Moach](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Moach](https://community.victronenergy.com/u/Moach)\ **Post date:** [7 October 2024 20:25 UTC](https://community.victronenergy.com/t/3xmulti-plus-8xmppt-plus-2xdiy-batteries-setup-for-voltages-bulk-absorption-float/6758/1 "2024-10-07T20:25:55Z")
Dear Community! Maybe, you can support me to find the right setup for my “project”. In a nutshell: 3 Multi (3000) parallel (for each phase) with 8 MPPTs (for the different angles on the roof) and 2x DIY batteries (16 cells per battery) = 48V system. Setup since January running with changes (to 3 phase setup) in June. Systems runs perfect and “not”. Perfect - no additional energy imported form the public net = 99,9% “stand-alone” (Autarkie). No issues, no effort, runs smoth, perfect, 2+ days without any import from public, no export only “own consumption”, … Not perfect - I know that during the setup of my Multis, I entered a voltage of 56,8 or 58,4? voltage within the ESS setup (3.55V/3.65V per cell = 16 cells). Now, I want to reduce the voltage during the charging process (bulk and absorption). I activated DVCC and entered 55,2V for - I guess - it’s charging voltage? Where can I change the absorption voltage? Within the Multis? → I checked via Home Assistant (BMS are connected to Home Assistant) the max voltage and some cell voltages → 3.65V during absorption I would say which is too high why I want to reduce this one to 3.45V (or sth. similar). During charging - not more than 55V just only a peak after “bulk” up to 56,xxV. What about float voltage? Any suggestions, tip’s, tricks? Thank you and best regards. ---
**Author:** ![1234enough](https://avatars.discourse-cdn.com/v4/letter/1/ea666f/32.png) [@1234enough](https://community.victronenergy.com/u/1234enough)\ **Post date:** [8 October 2024 06:19 UTC](https://community.victronenergy.com/t/3xmulti-plus-8xmppt-plus-2xdiy-batteries-setup-for-voltages-bulk-absorption-float/6758/2 "2024-10-08T06:19:22Z")
With such an impressive system, i would suggest reading up / learning all set up parameters, before a setting causes an inciden. All information can be found on “[Victron Energy - Victron Professional](https://professional.victronenergy.com/accounts/login/?next=/)” ---
**Author:** ![Moach](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Moach](https://community.victronenergy.com/u/Moach)\ **Post date:** [8 October 2024 07:31 UTC](https://community.victronenergy.com/t/3xmulti-plus-8xmppt-plus-2xdiy-batteries-setup-for-voltages-bulk-absorption-float/6758/3 "2024-10-08T07:31:49Z")
I already did but as I also know, not everything is covered within the documentation (I also got some hints in forums like this one). That’s why I want to exchange with others to get an idea, how I can change the voltages to reduce the load for the batteries/cells. ---
**Author:** ![pwfarnell](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/pwfarnell/32/2341_2.png) [@pwfarnell](https://community.victronenergy.com/u/pwfarnell)\ **Post date:** [8 October 2024 08:47 UTC](https://community.victronenergy.com/t/3xmulti-plus-8xmppt-plus-2xdiy-batteries-setup-for-voltages-bulk-absorption-float/6758/4 "2024-10-08T08:47:27Z")
You need to adjust the settings in the Multipluses using a mk3 VE Bus to USB interface connected to a laptop running Victron VE Configure. If you have a GX device you can also do remote VE Configure via VRM. There are things to be careful about when programming parallel and 3 phase. [VE Configure](https://www.victronenergy.com/media/pg/VEConfigure_Manual/en/index-en.html) [Remote VE Configure](https://www.victronenergy.com/live/vrm_portal:remote-veconfigure) This is quite involved and care must be taken. There is no simple setting somewhere to deal with this. ---
**Author:** ![Moach](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Moach](https://community.victronenergy.com/u/Moach)\ **Post date:** [8 October 2024 11:17 UTC](https://community.victronenergy.com/t/3xmulti-plus-8xmppt-plus-2xdiy-batteries-setup-for-voltages-bulk-absorption-float/6758/5 "2024-10-08T11:17:07Z")
No problem - I used the adapter to configure every Multi (as three phase system + ESS). Yes, Cerbo also installed. I’ll check the shared information again and in case of further question, I’ll ask here.