Will I be able to use my Projecta 3 Stage DC to DC 20 Amp charger with a 140 Amp Lithium battery ? The 3 stages are Bulk , Absorption and Float .
Cheers,
Jontee .
Whenarewethere said
05:06 PM Nov 10, 2022
Look up its manual (or download it) & see it it has a lithium setting. If it doesn't have a clearly stated lithium setting don't use it.
nomadz said
09:33 PM Nov 10, 2022
Jontee,
I had the same Projecta dcdc and used it for 6 yrs with my 400amp lithiums.
Never missed a beat.
I actually purchased another one and paralleld them together to give 40amp.
Very heavy duty and will run all day long at full output.
Neither had Lithium profile but I seem to remember I had them on AGM!!
Replaced them with an Enerdrive 50 amp dcdc as I thought they were giving me problems.
Turned out to be a very bad connection that was getting hot.
The Enerdrive is good and also has a seperate mppt solar connection that I can use for my portable panels.
Still have both Projectas sitting in the hangar.
Regards,
Ian
TimTim said
09:46 AM Nov 11, 2022
There are many that use 3 stage chargers for LiFePO4 but it it does not have a LiFePO4 setting will not charge your battery to 100%. It will be close though. Set it on AGM, as Nomadz said, charge it up and then see what voltage it settles at.
Some battery manufactures do not recommend charging to 100% so as to increase the number of cycles during the batterys lifespan. This maybe 4000 instead of 3000 cycles but at the end of the day the battery will supposedly still have 80% capacity. In some the BMS is set so that you can only get something like 80% capacity from them.
Scubadoo said
06:26 AM Nov 12, 2022
I struggle to understand why a "3 stage" battery charger set to a suitable AGM setting would not charge a LiFePO4 battery to 100%. Our now almost 9 year old 4 cell 300Ah LiFePO4 battery is ALWAYS full once the voltage at the battery terminals reaches 14.2V whether charging at 5 amps or 130A (50A solar + 80A alternator).
Both the Victron SmartShunt and Junctek shunt based battery monitor tell me so.
No absorption time is necessary. Ours then alternator "floats" at 14.0V when driving with the headlights on or c13.35V while the sun shines.
If the DC-DC charger does not exceed say 14.4V on bulk and absorption then up to 13.8V on "float" I would not be concerned for the battery for a few hours driving once it reaches 100% SOC.
-- Edited by Scubadoo on Saturday 12th of November 2022 06:35:20 AM
-- Edited by Scubadoo on Saturday 12th of November 2022 07:57:32 AM
Whenarewethere said
07:45 AM Nov 12, 2022
My Sony mobile phone (not sold in Australia as our market is too small) has a setting for 80% maximum charge which is what I have set the charging to for maximum battery life.
jontee said
02:46 PM Nov 12, 2022
G`day ,
Thanks to all those who have replied to my question, you have been most helpful .
Cheers ,
Jontee .
G`day ,
Will I be able to use my Projecta 3 Stage DC to DC 20 Amp charger with a 140 Amp Lithium battery ? The 3 stages are Bulk , Absorption and Float .
Cheers,
Jontee .
Look up its manual (or download it) & see it it has a lithium setting. If it doesn't have a clearly stated lithium setting don't use it.
Jontee,
I had the same Projecta dcdc and used it for 6 yrs with my 400amp lithiums.
Never missed a beat.
I actually purchased another one and paralleld them together to give 40amp.
Very heavy duty and will run all day long at full output.
Neither had Lithium profile but I seem to remember I had them on AGM!!
Replaced them with an Enerdrive 50 amp dcdc as I thought they were giving me problems.
Turned out to be a very bad connection that was getting hot.
The Enerdrive is good and also has a seperate mppt solar connection that I can use for my portable panels.
Still have both Projectas sitting in the hangar.
Regards,
Ian
There are many that use 3 stage chargers for LiFePO4 but it it does not have a LiFePO4 setting will not charge your battery to 100%. It will be close though. Set it on AGM, as Nomadz said, charge it up and then see what voltage it settles at.
Some battery manufactures do not recommend charging to 100% so as to increase the number of cycles during the batterys lifespan. This maybe 4000 instead of 3000 cycles but at the end of the day the battery will supposedly still have 80% capacity. In some the BMS is set so that you can only get something like 80% capacity from them.
I struggle to understand why a "3 stage" battery charger set to a suitable AGM setting would not charge a LiFePO4 battery to 100%.
Our now almost 9 year old 4 cell 300Ah LiFePO4 battery is ALWAYS full once the voltage at the battery terminals reaches 14.2V whether charging at 5 amps or 130A (50A solar + 80A alternator).
Both the Victron SmartShunt and Junctek shunt based battery monitor tell me so.
No absorption time is necessary. Ours then alternator "floats" at 14.0V when driving with the headlights on or c13.35V while the sun shines.
If the DC-DC charger does not exceed say 14.4V on bulk and absorption then up to 13.8V on "float" I would not be concerned for the battery for a few hours driving once it reaches 100% SOC.
-- Edited by Scubadoo on Saturday 12th of November 2022 06:35:20 AM
-- Edited by Scubadoo on Saturday 12th of November 2022 07:57:32 AM
My Sony mobile phone (not sold in Australia as our market is too small) has a setting for 80% maximum charge which is what I have set the charging to for maximum battery life.
Thanks to all those who have replied to my question, you have been most helpful .
Cheers ,
Jontee .