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How to Program a Solar Charge Controller

This blog post will teach you how to program a solar charge controller to deliver a proper charge profile to your battery bank.

Now… What is a charge profile?  Well, there are MANY different battery chemistries on the market.  Lead Acid, AGM, and Lithium Iron Phosphate are three of the most common ones seen in camper electrical systems… and each one wants to be charged just a little differently.

One may want to be charged at 14.2V where the next one wants to be charged at 15.1V.

One battery may need a higher voltage charge when it’s cold when the next battery doesn’t care what temperature it is.

One battery may need to be charged slower the closer it is to full and the next battery may be able to be charged at a constant rate.

How to Program a Victron SmartSolar Charge Controller

The Victron SmartSolar charge controllers can be most easily programmed by using the VictronConnect app on any smartphone. Once the app is downloaded to your device and installed, make sure your bluetooth on your phone is turned on and navigate to the battery settings menu.

Click on the charge controller that you would like to program.

Click on the cog icon in the upper right part of the screen:

Click the ‘Battery’ menu to access the battery settings menu.

And fill in the values as appropriate for the specific battery bank that you are programming the charge controller for. The example below is the recommended values for Battle Born LiFePO4 Batteries.

How to Find the Best Charging Settings for Your Batteries

Although there are general charging parameters recommended for the various chemistries of batteries, it’s always a good idea to get the recommended charging values for your batteries directly from the manufacturer of your batteries as the recommended charging values can vary depending on the brand.

MOST battery manufacturers have their recommended charging values listed on their website or on the product info sheet, but if this is not available, you should email their customer support and ask them this:

Recommended Battery Charging Parameters Email Template

Hey {Battery Company} Team!  I have purchased {Qty} of your batteries and am wiring them into a {12V/24V/36V/48V} battery bank and I am looking for some information on what the proper charging parameters are for your batteries.  I am charging with the Victron SmartSolar charge controller and here is a list of the charging parameter values I can change:

Absorption Voltage:
Float Voltage:
Equalization Voltage:
Re-Bulk Voltage offset:
Absorption Duration: (Adaptive/Fixed)
Maximum Absorption Time:
Tail Current:
Equalization Current Percentage:
Automatic Equalization: (Disabled / Equalize every ____ Days)
Equalization stop mode: (Fixed Time / Automatic on Voltage)
Maximum Equalization Duration:
Temperature Compensation (mV/°C):
Low-Temperature Cutoff (optional):

I’ve attached a screenshot of the battery settings page from the Victron Connect App for your reference

Would you please let me know what you recommend for these settings, please?

Thanks so much!

An Superfan,
Consider putting your name here

Feel free to save this image and attach it to the email above. Also… If you get a response from your battery company with the recommended parameters and want me to add it to this page, please forward your correspondence with the manufacturers recommended parameters to

Paul Stafford

Sunday 29th of May 2022

Hi Nate,

I've purchased your 30A OEM plans and will be doing the full install, Multiplus, MPPT, Orion, Lynx distributor, and Smart Shunt (actually I've already done the shunt). I've just discovered the Cerbo GX and GX touch 50,and want to install the touch display on a wall in the RV.

My question is this: it appears that the Touch 50 requires a hard-wired connection to the Cerbo (via hdmi & usb) which is not so bad); but is it possible to use the Bluetooth comms for the Cerbo to talk to *all* the other units? I really don't want to have to run VE cables from all the units to the Cerbo.

Thanks very much for your time (and also thx for a great YouTube channel and website- by far the most complete and user friendly source of info I've found.



Monday 13th of December 2021

Keep up the good work Sir!

Greetings from Oz.


Thursday 30th of September 2021

Hi I’m Tim. I’ve tried to research this problem off mine with no luck I’m hoping you might be able to help me. I have a 30 ft camper hooked to my house in 2 ways I’m off grid and have a generator that I plug the camper into and a soler system hooked to the 12v battery wires on the front of the camper when I start the generator it’s charging the battery’s is this a good thing or bad for the system? Thank you for your time on reading this hopping you can help.

How to Program a Solar Charge Controller – - Xplore World - Van Life Travel

Thursday 19th of August 2021

[…] Source link […]

Laurence Jay Greenwood

Wednesday 4th of August 2021

do you have parameters for Lifline 8D 12v AGM Marine batteries ?