High Rest Voltage on a 48v

jonboyb · 11-11-2019, 04:44 PM

Just resurrected a 2010 RXV and had 4 new 12v installed. Even bought the dealer recommended charger to ensure I was starting right. They gave it its initial charge. Drove a little then recharged with my new charger. Hit 61v near end of cycle and 52.4 volts when it switched off. At 12 hour rest, 51.5 volts and now almost 24 hours and still 51.5 volts. Charger unhooked so not related to float charge. Am I worrying about nothing here and will take a few cycles before they settle into the 50.9 correct range?

Mooncarter · 11-11-2019, 04:53 PM

Seems good to me.

jonboyb · 11-11-2019, 05:00 PM

Ok. Just drove it about a 1/4 mile to grab the kiddos from bus stop and down to 50.7 now.

usgicollector · 11-11-2019, 05:01 PM

I agree your good to go

.

JohnnieB · 11-11-2019, 07:09 PM

What make/model Batteries?

Different brands have different 100% SoC voltages.

50.9V is for Trojan brand batteries, but the SoC chart is based on the average At-Rest voltage of a statistical population of mature (IE: broken in) batteries, so newer batteries may have a bit higher voltage while older batteries may have a bit lower voltage.

Best practice is to record the individual battery at-rest voltages when new and again every six months or so as they age.

11-11-2019, 04:44 PM	#1
jonboyb Not Yet Wild Join Date: Nov 2019 Posts: 15	High Rest Voltage on a 48v Just resurrected a 2010 RXV and had 4 new 12v installed. Even bought the dealer recommended charger to ensure I was starting right. They gave it its initial charge. Drove a little then recharged with my new charger. Hit 61v near end of cycle and 52.4 volts when it switched off. At 12 hour rest, 51.5 volts and now almost 24 hours and still 51.5 volts. Charger unhooked so not related to float charge. Am I worrying about nothing here and will take a few cycles before they settle into the 50.9 correct range?
jonboyb Not Yet Wild Join Date: Nov 2019 Posts: 15

11-11-2019, 04:53 PM	#2
Mooncarter Gone Insane Join Date: Oct 2016 Location: Richmond, VA Posts: 14,215	Re: High Rest Voltage on a 48v Seems good to me.

11-11-2019, 05:00 PM	#3
jonboyb Not Yet Wild Join Date: Nov 2019 Posts: 15	Re: High Rest Voltage on a 48v Ok. Just drove it about a 1/4 mile to grab the kiddos from bus stop and down to 50.7 now.
jonboyb Not Yet Wild Join Date: Nov 2019 Posts: 15

11-11-2019, 05:01 PM	#4
usgicollector Gone Wild Join Date: Mar 2014 Location: NE Indiana & SW Florida Posts: 3,238	Re: High Rest Voltage on a 48v I agree your good to go.

11-11-2019, 07:09 PM	#5
JohnnieB Techno-Nerd Join Date: Jun 2011 Location: West Virginia Posts: 19,654	Re: High Rest Voltage on a 48v What make/model Batteries? Different brands have different 100% SoC voltages. 50.9V is for Trojan brand batteries, but the SoC chart is based on the average At-Rest voltage of a statistical population of mature (IE: broken in) batteries, so newer batteries may have a bit higher voltage while older batteries may have a bit lower voltage. Best practice is to record the individual battery at-rest voltages when new and again every six months or so as they age.

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