Jbarnes1719
New Member
- Joined
- Apr 6, 2021
- Messages
- 34
Trying find the right lifepo4 charger to incorporate into my rv for charging my 100ah batteries.
What voltage are your batteries? Use that in a search string on Amazon and Google. Based on the typical .5C charge you would not need one larger than 50 Amps. Prices vary by Amp capacity so if you have the time you can save some money by buying one that would charge slower.Trying find the right lifepo4 charger to incorporate into my rv for charging my 100ah batteries.
Unless his RV is fairly new, it probably came with a 'converter' which does exactly that - Converts 120 VAC to a single voltage DC, typically 13 volts or so which isn't good for charging ANY battery - The voltage is low enough it will take forever to recharge even a small lead acid battery, but high enough that once it is fully charged, it will boil the water out of the batteryWelcome to the forum.
What converter does your RV have now?
What voltage are your batteries? Use that in a search string on Amazon and Google. Based on the typical .5C charge you would not need one larger than 50 Amps. Prices vary by Amp capacity so if you have the time you can save some money by buying one that
Trying find the right lifepo4 charger to incorporate into my rv for charging my 100ah batteries.
Parallax 7355 power center with 55amp charge/ converter. But I realized that my voltage is 13.7 and will only charge them to 90%. Because of the age of the power center the options are few for a replacement charge/ converter.Welcome to the forum.
What converter does your RV have now?
I am building two Calb 100 ah with overkill bms’s. I have solar but not the enough working on that too. But the hard part is getting them charged from shore power. After my searches so far I know I need at least 14.4-14.6 to bulk charge to reach 100% capacity.What voltage are your batteries? Use that in a search string on Amazon and Google. Based on the typical .5C charge you would not need one larger than 50 Amps. Prices vary by Amp capacity so if you have the time you can save some money by buying one that would charge slower.
Yes two. 100ah lifepo4 built from calb cells.It sounds like the OP may have have more than one 100Ah battery. More details are needed!
I am building two Calb 100 ah with overkill bms’s. I have solar but not the enough working on that too. But the hard part is getting them charged from shore power. After my searches so far I know I need at least 14.4-14.6 to bulk charge to reach 100% capacity.
Should 4-3.2 volt cells. Max is I believe 3.6v.I am building two Calb 100 ah with overkill bms’s. I have solar but not the enough working on that too. But the hard part is getting them charged from shore power. After my searches so far I know I need at least 14.4-14.6 to bulk charge to reach 100% capacity.
What would you suggest on the battery monitor? The Overkill bms’s have bluetooth and lot monitoring parameters.
Personally, I would use it and see how it works.
The bigger issue is with wiring and distance. Most RVs have crappy wiring that has a substantial voltage drop between the converter and the batteries.
Here's an example of where I charged a CALB cell to 99.6% SoC @ 3.45V (13.8V):
Going to lithium, converter question....
The majority of LFP charging occurs below 13.6V. PD has a motivation to sell new converters. I have a motivation to enable informed choices. I have personally charged a single cell to 95% capacity @ 3.4V. It started at 0.33C...diysolarforum.com
The downside is that your charges will take longer.
The upside is that this is less stressful to the battery - longer life.
Get a good battery monitor (you need one anyway) and see how it works for you before you replace it.
Also because of the age of the rv they used 6 gauge copper from the charger/converter to the batteries.
Personally, I would use it and see how it works.
The bigger issue is with wiring and distance. Most RVs have crappy wiring that has a substantial voltage drop between the converter and the batteries.
Here's an example of where I charged a CALB cell to 99.6% SoC @ 3.45V (13.8V):
Going to lithium, converter question....
The majority of LFP charging occurs below 13.6V. PD has a motivation to sell new converters. I have a motivation to enable informed choices. I have personally charged a single cell to 95% capacity @ 3.4V. It started at 0.33C...diysolarforum.com
The downside is that your charges will take longer.
The upside is that this is less stressful to the battery - longer life.
Get a good battery monitor (you need one anyway) and see how it works for you before you replace it.
Also because of the age of the rv they used 6 gauge copper from the charger/converter to the batteries.
they were running 55amps thru a long length of 6awg wire??? toasty...Also because of the age of the rv they used 6 gauge copper from the charger/converter to the batteries.
they were running 55amps thru a long length of 6awg wire??? toasty...
I believe because of the lead acid chemistry and the lack of a heavy load from powering the lights which only draws 10.17amps with every light on and the furnace blower motor with 11 amps draw they didn’t expect much. If this was all I needed then one 100ah battery would be enough. With everything running the rv draws around 2500 watts from shore power at 123vac.they were running 55amps thru a long length of 6awg wire??? toasty...