Moved this from another thread to open the topic generally. Question was if PD converters with the 13.2 storage voltage were compatible with floating voltage specs at 13.5 and above.----------------Many (all?) battery specs have the same floating voltages (2.25 a cell or so) My AGMs did and also the flooded batts I have had.PD's are used successfully with all those other batteries according to various reportsTrojan eg, has 2.25 too, and says not to float either flooded or AGM at all if they will be charged frequently. ("cyclic use"?) So the PD's "storage" mode at only 13.2v is confusing. Is "storage" really "float" or something else?https://www.trojanbattery.com/pdf/TrojanBattery_UsersGuide.pdfFloat is supposed to just make up for self-discharge so 13.5-13-8 typical seems high for that, unless it is GC2 6s? Resting voltage of a full flooded is more like 12.8 so 13.2 is more above that. My ordinary AGMs spec resting at full was 13.0 though, and nobody said a PD is no good with AGMs.Now I am not sure what "floating" vs "storage" is all about. Anybody explain? Thanks.

BFL13,The best is to have the voltage vary with the temperature of the battery. That feature is available on most good solar charge controllers, and also on high quality inverter/chargers such as Victron.

13.2 works well when combined with the 15 minute boost charge at 14.6v every 20 hours.Otherwise storage and float are the same thing as far as I am concerned.Although if the battery has been floating in storage for an extended period I do find that first cycle is a bit weak and seems to restore on the first charge cycle. Might be virtually the same to let them just rest disconnected for storage.

Sure, but 13.2v at 85F is like 13.7 at 50F so 13.2 is way low for 50F. The question is why store (float?) at 13.2 when the spec is for 13.6 at 77FRandy still has this float voltage table-scroll down, eg. I think there are better tables but gives the idea sort of.http://www.bestconverter.com/Parallax-Paramode-with-TempAssure_c_104.html

US battery says float 13.02 at 80FNothing wrong with following the manufacturer's specification.https://www.usbattery.com/technical-info/charging-instructions/

Lots of battery myths would be corrected if RVers would read the Trojan Users Guide.

Floating vs Storage Voltage Question | Good Sam Community

BFL13
Explorer II
Nov 29, 2020
Interesting about that US Battery float voltage for flooded at 2.17 per cell. Their AGM is 2.23

Meanwhile Trojan is at 2.25 for both types, and East Penn (Deka) is at 2.24-2.26 for AGM and 2.30-2.35 (13.8-14.10v) for flooded.

Seems they all agree on AGMs but are all over the map for flooded batts.

We have had many posts about how 13.8 is too high and how you have to keep adding water at that voltage, saying 13.2 is required to stop that. But the battery specs are as above for 77F.

EDIT--Note that Trojan says not to float floodeds if they are used more than once a week, but say for AGMs it is if they are used more than once a month.
Lwiddis
Explorer II
Nov 29, 2020
Lots of battery myths would be corrected if RVers would read the Trojan Users Guide.
time2roll
Nomad
Nov 29, 2020
US battery says float 13.02 at 80F

Nothing wrong with following the manufacturer's specification.

https://www.usbattery.com/technical-info/charging-instructions/
BFL13
Explorer II
Nov 29, 2020
Sure, but 13.2v at 85F is like 13.7 at 50F so 13.2 is way low for 50F. The question is why store (float?) at 13.2 when the spec is for 13.6 at 77F

Randy still has this float voltage table-scroll down, eg. I think there are better tables but gives the idea sort of.

http://www.bestconverter.com/Parallax-Paramode-with-TempAssure_c_104.html
time2roll
Nomad
Nov 29, 2020
13.2 works well when combined with the 15 minute boost charge at 14.6v every 20 hours.
Otherwise storage and float are the same thing as far as I am concerned.

Although if the battery has been floating in storage for an extended period I do find that first cycle is a bit weak and seems to restore on the first charge cycle. Might be virtually the same to let them just rest disconnected for storage.
pianotuna
Nomad III
Nov 29, 2020
BFL13,

The best is to have the voltage vary with the temperature of the battery. That feature is available on most good solar charge controllers, and also on high quality inverter/chargers such as Victron.

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