MPPT settings

[Glynn]

Hi
What would be the best ‘full’ settingson a victron mppt 100/50 to charge a life po4 180Ah battery ?

 

[Phill D]

on the lithium setting on the mppt, i dont believe it diferentiates between different types of lithiam batteries.

 

[Gaston aires]

Lithium setting on the MPPT if you have it, gel setting if you haven’t. This is according to Fogstar. I use this on the Shaudt charger as well. Works great for me.
Phil

 

[AdrianChen]

I selected the pre-set for Smart Lithium, and then changed the Absorption voltage to 14.25v to suit the way my BMS is setup according to the battery maker. I also set the absorption time to 1h 25m because of an old "rule" in the lithium book of Myths and Legends to allow 20 to 30 mins per 100ah for Absorption/cell balancing. Seems to be fine, although the standard for the Victron pre-set is 2hrs so I doubt it makes much difference!

What battery do you have?

 

[jumar]

That's one hell of a mppt for one battery...how much solar have you got...lots I imagine..

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[Glynn]

I selected the pre-set for Smart Lithium, and then changed the Absorption voltage to 14.25v to suit the way my BMS is setup according to the battery maker. I also set the absorption time to 1h 25m because of an old "rule" in the lithium book of Myths and Legends to allow 20 to 30 mins per 100ah for Absorption/cell balancing. Seems to be fine, although the standard for the Victron pre-set is 2hrs so I doubt it makes much difference!

What battery do you have?

Its a Titan Lithium Gold 180Ah

Lithium Leisure Battery - TITAN Lithium Gold 12V 180Ah Battery

TITAN Lithium's new flagship - the world's highest-capacity H8 battery with 180Ah / 2,304Wh of capacity. It is a perfect drop-in replacement for existing lead-acid batteries, enabling weeks off-grid and paired seamlessly with our latest 250A BMS, resulting in the highest-performing battery...

www.titanlithium.co.uk

 

[AdrianChen]

Its a Titan Lithium Gold 180Ah

Lithium Leisure Battery - TITAN Lithium Gold 12V 180Ah Battery

TITAN Lithium's new flagship - the world's highest-capacity H8 battery with 180Ah / 2,304Wh of capacity. It is a perfect drop-in replacement for existing lead-acid batteries, enabling weeks off-grid and paired seamlessly with our latest 250A BMS, resulting in the highest-performing battery...

www.titanlithium.co.uk

Can't see why that would need anything different from the Victron standard Smart Lithium Setting.

 

[Hoovie]

I don't know the details of the battery you are fitting, but something to check on ... The Victron settings for Lithium/LiFePO4 have a default setting to turn the Charger off if the temperature of the controller (note the CONTROLLER, and not the battery) drops below 5C. If the battery has an integrated Heater you will want to turn that setting off to take advantage of any current pulled in from the panels.

 

[AdrianChen]

I think the Victron controllers only check the temps once (per day) as the sun rises and it powers up, I popped a temp sensor onto my setup, and rely on that. Hadn't thought about heat pads, its a good point!

I guess in deepest winter when it is cold so little power comes off my panels, I wonder if it's enough to heat the battery much - all good now spring is nearly here!

 

[Hoovie]

I think the Victron controllers only check the temps once (per day) as the sun rises and it powers up, I popped a temp sensor onto my setup, and rely on that. Hadn't thought about heat pads, its a good point!

I guess in deepest winter when it is cold so little power comes off my panels, I wonder if it's enough to heat the battery much - all good now spring is nearly here!

That is right - by default it checks the temp only the once at the point the controller wakes up - so if it is a cold start to the day, the risk is the charger in the controller could actually stay off all-day depending where the controller is fitted!
I think if it is set to use an external temp sensor - such as from the SBS on a VE.Network, or is connected to a Cerbo GX with "DVCC" (and "STS" - Shared Temperature Sense" within it) enabled, the temperature becomes a Real-time check.
I would definately recommend a SBS at least if the installation needs the chargers to turn off at low temps.

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