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Fefanatic · 01-27-2023, 07:04 AM

I am thinking of replacing the four 6 volt batteries with a pair of 100ah Lipo batteries. Who has done this and what batteries have you used? Have they worked out for you?

jjensen22 · 01-27-2023, 10:08 AM

Your 6 6volt batteries are probably 660 amp hours of battery, a pair of 100 amp lithiums are going to be 200 amp hours. Remember that gives you a smaller "gas tank" to pull from. You won't last as long, but lithiums will let you charge and discharge faster.

You will need a proper charging system. If you are in a motorhome, you would need a charge controller from the engine that is for lithium batteries, also the converter or inverter/charger would need to have lithium settings. Not usually too expensive on the newer stuff, since everything is coming with those settings now. Older units will probably get expensive switching out the charging components.

Tskadberg · 01-27-2023, 12:08 PM

Comparing amp hour rating is tricky business. My rule of thumb is that 100 amp hour of lithium is worth 200 amp hour of flooded. Based on my usage, we run an inverter for fridge. Flooded loose a lot of capacity the higher the amp draw. See Peukert's law. The rating on the batteries is based on a 5 amp draw. So if all you use are LED lights your math might be different. You also have to factor in how far you want to discharge your batteries. I went with a 12 volt system so I can easily add a battery if my needs require it. Only way to know is to start somewhere and get YOUR real world usage out of it. If you do and need more then add more when you can.

https://en.m.wikipedia.org/wiki/Peukert%27s_law

twinboat · 01-27-2023, 12:43 PM

Quote:

Originally Posted by Tskadberg

Comparing amp hour rating is tricky business. My rule of thumb is that 100 amp hour of lithium is worth 200 amp hour of flooded. Based on my usage, we run an inverter for fridge. Flooded loose a lot of capacity the higher the amp draw. See Peukert's law. The rating on the batteries is based on a 5 amp draw. So if all you use are LED lights your math might be different. You also have to factor in how far you want to discharge your batteries. I went with a 12 volt system so I can easily add a battery if my needs require it. Only way to know is to start somewhere and get YOUR real world usage out of it. If you do and need more then add more when you can.

https://en.m.wikipedia.org/wiki/Peukert%27s_law

Some of your statements are wrong .

The 20 hour rating on flooded batteries is based on 5 amps per 100 AH. 200 AH bank =10 amps and on up.

Flooded batteries can safely be cycled down to 30% SOC, so tha/gives you 70% usable capacity.

Lithium can be cycled to 0% but then they shut off. Now you have nothing. So with the proper charger that will bring them up to 100%, you will safely have about 90% usable capacity.

If your using a flooded battery charging system, then your batteries are only charging to 80%. Now you have 70% usable capacity.

Tskadberg · 01-30-2023, 06:07 AM

Quote:

Originally Posted by twinboat

Some of your statements are wrong .

The 20 hour rating on flooded batteries is based on 5 amps per 100 AH. 200 AH bank =10 amps and on up.

Flooded batteries can safely be cycled down to 30% SOC, so tha/gives you 70% usable capacity.

Lithium can be cycled to 0% but then they shut off. Now you have nothing. So with the proper charger that will bring them up to 100%, you will safely have about 90% usable capacity.

If your using a flooded battery charging system, then your batteries are only charging to 80%. Now you have 70% usable capacity.

Can you be more specific? Sounds like we are in agreement to me.

Myk55 · 01-30-2023, 12:08 PM

Quote:

Originally Posted by Fefanatic

I am thinking of replacing the four 6 volt batteries with a pair of 100ah Lipo batteries. Who has done this and what batteries have you used? Have they worked out for you?

Hey, Battle Born are the best but Lion and Dave's RV channel on YT has a newer brand. Dave brand https://www.timeusbpower.com/?ref=C5G... Discount Code - " Dave4 "
5 year warranty $649.99 plus if you use Dave code Dave4 you get a discount you get a $26 discount off the price. He had not problems. The other one is LItime batteries https://www.litime.com/ Newmar using these now instead of Dargonfly aka Battle Born.

The one thing is temperature lithium's don't like really hot and cold so placement in an area where the temps are stable. the weight difference is really a lot. these are 80 pounds for 400amp hours 160lbs compared to 500lbs. I would have a company install the system check around

MYK

Florida