Off grid battery connections

[Truck off grid]

I have a renogy system
(1)40 amp mppt
(4) 100w. Panels connected in series
(4) lithium iron batteries in parallel
(1)2000w inverter
(1) 20 amp dc to dc charger
My question is after I have battery connections in parallel to a (4) stud post negative and (4) stud post positive I go directly to the inverter and mppt is coming from (4) stud post also . Do I connect dc to dc charger to end of battery bank or to (4) stud post .

 

[John Frum]

Is this your setup?

+ battery<->mrbf_fuse<->main_cable<->disconnect<->buss_bar|->inverter_cable->inverter
                                                          |<-scc_cable<-breaker<-scc
                                                          |<-dc_dc_charge_cable<-breaker<-dc_dc_charger
- battery<->main_cable<------------------>shunt<->buss_bar|<-inverter_cable<-inverter
                                                          |->scc_cable->scc
                                                          |->dc_dc_charge_cable->dc_dc_charger

 

[Truck off grid]

Is this your setup?

+ battery<->mrbf_fuse<->main_cable<->disconnect<->buss_bar|->inverter_cable->inverter
                                                          |<-scc_cable<-breaker<-scc
                                                          |<-dc_dc_charge_cable<-breaker<-dc_dc_charger
- battery<->main_cable<------------------>shunt<->buss_bar|<-inverter_cable<-inverter
                                                          |->scc_cable->scc
                                                          |->dc_dc_charge_cable->dc_dc_charger

Yes just trying to connect dc to dc controller and cant get answers on place to connect at . Though it would be best to fead the end of parallel battery bank. Versus connect at same side mppt and inverter are . And wondering if I need anything to help balance x4 battery bank

 

[John Frum]

I think you are are asking if you can connect each charge source and load to common busbars confirm?

 

[SCClockDr]

From your verbal disruption I'd say connect to the center posts of each bus. My reasoning is to match resistance.
Connecting direct to the end battery means minimal resistance for battery one & two bus wires of resistance for all the others. (Out one, in two, three, or four.) I'd also connect positive to post 2 & negative to post 3, visa versa if that is your preference.

 

[Truck off grid]

I think you are are asking if you can connect each charge source and load to common busbars confirm?

Either connect at buss bar with inverter and mppt connections. Or connect to back end of battery bank (x4).reason for thinking of it is understanding how power can come in and go out on same stud and charge at same time . My mind says it cant work . May not be correct but sounds good?

 

[Truck off grid]

From your verbal disruption I'd say connect to the center posts of each bus. My reasoning is to match resistance.
Connecting direct to the end battery means minimal resistance for battery one & two bus wires of resistance for all the others. (Out one, in two, three, or four.) I'd also connect positive to post 2 & negative to post 3, visa versa if that is your preference.

I kind of understand you but than I dont fully get it /how.
My first draft of wireing set up was to have each battery connections go directly to buss bar individually. Then connect dc to dc charger and mppt with inverter on buss bar .
After trying to watch video and read it got confusing and I just made a parallel connection from battery to battery and took positive from battery 1 and negative from battery 4 to buss bars . I can still connect dc to dc on battery 1-4?

 

[Truck off grid]

Taking opposite poles to distribute energy flow is my thinking?

 

[John Frum]

Taking opposite poles to distribute energy flow is my thinking?

https://www.victronenergy.com/upload/documents/Wiring-Unlimited-EN.pdf

SmartGauge Electronics - Interconnecting multiple batteries to form one larger bank

 

[Truck off grid]

This helps solve most everything except pulling power and feeding 3 items. And there placement. Should mppt and inverter be connected at same point as dc to dc charger ? Should I cross feed opposite on batery bank

 

[SCClockDr]

This helps solve most everything except pulling power and feeding 3 items. And there placement. Should mppt and inverter be connected at same point as dc to dc charger ? Should I cross feed opposite on batery bank

You could X it with loads on 2, 3 & charger on 3, 2.

 

[Truck off grid]

You could X it with loads on 2, 3 & charger on 3, 2.

Yes , this is what I like to do for some reason in my mind of power being used at same time power coming in ? Was bugging me thank you

 

[Truck off grid]

https://www.victronenergy.com/upload/documents/Wiring-Unlimited-EN.pdf

SmartGauge Electronics - Interconnecting multiple batteries to form one larger bank

Love this info my new bible!

 

[Truck off grid]

I think you are are asking if you can connect each charge source and load to common busbars confirm?

Sorry I had no connection to reply. Yes I'm very happy with wire guide and I'm already hooked up with diagonally and I will put my charger on the end of my battery connections

 

[SCClockDr]

When current is aimed @ the battery & there is also a load demand, a portion of the current will be diverted to the load to satisfy its need. The balance will still go to the battery.

 

[Truck off grid]

But do you think it's good or better to balance the input to both opposing ends of adiagonally/ parallel set up .versus everything connected on one end .

 

[SCClockDr]

The idea is to view each wire as a resistor. Then seek to achieve a balance of resistance for each cell. While the concept is simple, achieving balance requires some thought & planning.

 

[Truck off grid]

Guess I'll have to try and fail to learn what's proper as it takes a long time to seek out correct info 100% of the time . I read ,I ask ,I try? Even on the forum you ask a question and pending you product of use or lack of experience you dont get your answers. You been helpful as smooth Joey. The dc wire book I wish I had a hard copy.

 

[SCClockDr]

https://www.victronenergy.com/upload/documents/Wiring-Unlimited-EN.pdf (page 19) for 4 optional configurations.

 

[Truck off grid]

https://www.victronenergy.com/upload/documents/Wiring-Unlimited-EN.pdf (page 19) for 4 optional configurations.

I real like this book and will try to have it printed thank you. I purchased a volt meter and it's a renogy?? Cant get coustomer service? 24 hr. return time . In trouble shooting says the symptoms ar backwards wireing? I put b- to battery negative and p- is my feed to terminal posts connection. If anything they have sticker backwards in guessing? Who knows guess I'll just disconnect till my return message or call comes ? Plug and play ? I'm ready to make a basket with the volt meter!