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jkirkebo avatar image
jkirkebo asked

Smartsolar maximum battery voltage

I am looking for a MPPT charge controller to charge a 11S lithium pack. However I cannot find any info on the maximum battery voltage of the different SmartSolar units (just a generic 12V24V or 48V statement).

It seems the absorbtion/float voltage can be set freely on these units but which unit can do the necessary 46,0V? Do I need to go to the expensive 150/35 or will the 100/20 do that? Input is only 440W@72V so no more that 10A output. Thus the 150/35 would be massive overkill.

It's not exactly easy to find small low-power 46V capable charge controllers...


MPPT Controllers
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stevo07 avatar image
stevo07 answered ·

Have a look at the datasheet below. The voltage absorption and float voltage limit is stated:


https://www.victronenergy.com/upload/documents/Datasheet-SmartSolar-charge-controller-MPPT-75-10,-75-15,-100-15,-100-20,-100-20_48V-EN.pdf

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jkirkebo avatar image
jkirkebo answered ·

Maybe I'm blind ;)

I can only find the following line:

Charge voltage 'absorption' 14,4V / 28,8V (adjustable) 57,6V (adj.)

It says "adjustable" but not what the limits for adjustment are. I was not aware there was a 100/20-48 model, that one will be perfect if the absorbtion and float voltage can be adjusted as low as 46,0V. But I need to know in advance, to expensive just to buy one to test :(

Same goes for float. I need it to charge up til 46,0V and hold voltage there until there is not enough sunlight anymore to do that. This is for a 11S lithium pack, thus needing the same value for bulk/absorption/float.

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adev avatar image adev commented ·

In the VictronConnect app there is a demo section where you can create virtual instances of all these products. I just did so for the 100/20_48.


With the battery set to 48v, there is still no way to adjust the bulk voltage. Abs, float and equalization can all be adjusted between 36.00v and 69.56v - to 2 decimal places.


I hope that’s helpful.

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Mark avatar image
Mark answered ·

I recommend to download the free VictronConnect software, then use the DEMO feature to select any potential MPPT unit and have a play yourself to see what the charge voltage can be adjusted to (as well as how it all works).

As long as the unit is capable to charge a regular 48v battery I think it should be fine.

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jkirkebo avatar image jkirkebo commented ·

Thanks, that did it :)

Using the demo mode I was able to set all voltages to 46V no problem, the maximum voltage is actually 69,56V for the 100/20-48V so it'll work fine also with 16S lithium. Great news, finally an affordable 48V MPPT :)

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Mark avatar image Mark ♦♦ jkirkebo commented ·

Glad to hear - sometimes its easiest/quickest to just try for yourself! :-)

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adev avatar image adev jkirkebo commented ·

where you able to also change the bulk charge voltage?

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