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 > RV Lithium Lite & Lithium Super Upgrade Systems - Mike Mas

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Idle-Up

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Posted: 02/03/21 06:32pm Link  |  Quote  |  Print  |  Notify Moderator

Hello Forum Users - I just completed my 2nd “Independent” In-Depth film on upgrading an RV to Lithium Power and wanted to share it with the forum. On my most recent film, I designed two different systems for RV’s titled; "Lithium Lite" and "Lithium Super".

The “Lithium Lite” system is based on a 300 amp hour system with 3,800 watts of capacity which essentially replaces and doubles the power of most RV’s AGM batteries. This system is ideal for smaller RV’s such as B, B+ and Class C RV’s.

The "Lithium Super” is a Powerhouse System which uses a 625 amp hour battery with 8,064 watts hour capacity which allows the entire coach to be run totally on lithium power, to even include the roof air conditioner for up to 8-10 hrs at a 50% cycle. This system also offers expansion to 1250 amp hours.

My design includes moving the house batteries (now lithium) from their past “open air” compartment, where the batteries were exposed to extreme temperatures, road dust, water & salt spray, to the opposite side of the coach, to a larger sealed compartment which is temperature controlled. This compartment also houses the inverter, BMS, solar controller and battery isolator, to allow very short cable runs for near zero loss.

This unique design captures “Free Heat” generated from the inverter and a neighboring AquaHot compartment to supplement the lithium batteries internal self-heating system to provider power saving and uninterrupted operation during freezing temperatures. I hope you enjoy the film - Mike Mas

Please click on the link below for the video

https://www.youtube.com/watch?v=k2RilLqYE5c&feature=youtu.be

Seems if the link is not active - please copy and paste either links above or below - Thanks!

https://youtu.be/k2RilLqYE5c

[image]

* This post was edited 02/04/21 10:08am by an administrator/moderator *

pianotuna

Regina, SK, Canada

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Posted: 02/03/21 08:38pm Link  |  Quote  |  Print  |  Notify Moderator

Idle up,

I'll have 7200 watt-hours of SiO2 batteries by the summer, and can use them at -40.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

pnichols

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Posted: 02/04/21 01:34pm Link  |  Quote  |  Print  |  Notify Moderator

Idle-Up wrote:

Hello Forum Users - I just completed my 2nd “Independent” In-Depth film on upgrading an RV to Lithium Power and wanted to share it with the forum. On my most recent film, I designed two different systems for RV’s titled; "Lithium Lite" and "Lithium Super".

The “Lithium Lite” system is based on a 300 amp hour system with 3,800 watts of capacity which essentially replaces and doubles the power of most RV’s AGM batteries. This system is ideal for smaller RV’s such as B, B+ and Class C RV’s.

The "Lithium Super” is a Powerhouse System which uses a 625 amp hour battery with 8,064 watts hour capacity which allows the entire coach to be run totally on lithium power, to even include the roof air conditioner for up to 8-10 hrs at a 50% cycle. This system also offers expansion to 1250 amp hours.

My design includes moving the house batteries (now lithium) from their past “open air” compartment, where the batteries were exposed to extreme temperatures, road dust, water & salt spray, to the opposite side of the coach, to a larger sealed compartment which is temperature controlled. This compartment also houses the inverter, BMS, solar controller and battery isolator, to allow very short cable runs for near zero loss.

This unique design captures “Free Heat” generated from the inverter and a neighboring AquaHot compartment to supplement the lithium batteries internal self-heating system to provider power saving and uninterrupted operation during freezing temperatures. I hope you enjoy the film - Mike Mas

Please click on the link below for the video

https://www.youtube.com/watch?v=k2RilLqYE5c&feature=youtu.be

Seems if the link is not active - please copy and paste either links above or below - Thanks!

https://youtu.be/k2RilLqYE5c

[image]


If your information and efforts have anything to do with use of the common Group27/31 size 100AH lithium batteries in an RV, you might want to consider doubling of capacity ... without doubling of the area where the batteries are kept ... through use of these Group 31 200AH lithium batteries instead:
https://www.lithiumion-batteries.com/pro........oup-31-12v-200ah-lithium-ion-battery.php


Phil, 2005 E450 Itasca Spirit 24V

pianotuna

Regina, SK, Canada

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Posted: 02/04/21 04:07pm Link  |  Quote  |  Print  |  Notify Moderator

Phil,
Nice find. I'm considering 270 amp-hour SiO2--but they might be pretty heavy, so it may be best to stay with 100 amp-hour jars.

Li doesn't have that sort of weight constraint, which is a feature I had not thought of before.

pnichols

The Other California

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Posted: 02/04/21 08:08pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

Phil,
Nice find. I'm considering 270 amp-hour SiO2--but they might be pretty heavy, so it may be best to stay with 100 amp-hour jars.

Li doesn't have that sort of weight constraint, which is a feature I had not thought of before.


Don,

Also note down aways on the page in the link I gave ... that their 200 AH Group 31 lithium battery still has about 70% of it's capacity at -4 degrees F. I wonder how they pulled that off? Internal heating?

phemens

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Posted: 02/05/21 07:26am Link  |  Quote  |  Print  |  Notify Moderator

Retaining capacity in LiFePo4 batteries isn't the issue, it's restoring the charge, that's where you'd need some kind of heating setup to maintain core temp. You can safely discharge at high efficiency in cold weather (I believe it's efficiency is substantially higher than wet cell).


2012 Dutchman Denali 324LBS behind a 2006 Ford F-250 V10 out of Montreal
1 DW, 1 DD, 1 DS, 2 HD (Hyper Dogs)
1200w solar, 600AH LIFePO4, Yamaha EF2000 gen, Samlex 3000w Inverter

pianotuna

Regina, SK, Canada

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Posted: 02/05/21 10:50am Link  |  Quote  |  Print  |  Notify Moderator

phemens,

The reading I've done (which may be incorrect) suggest low slow charging may be possible at -20 c (-4 f)

Tonight it will be -33c here.

phemens

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Posted: 02/06/21 09:43am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

phemens,

The reading I've done (which may be incorrect) suggest low slow charging may be possible at -20 c (-4 f)

Tonight it will be -33c here.


Yes, I've heard that as well. My use case is really on the borderline of the threshold for regular charging (getting down to below 0c occasionally, with risk of battery core temp falling into that 'danger zone'), and that's for a couple of weeks at the end of the season (maybe longer is we start extending). Since we're not there to make adjustments during the week, the safest option for me is the waste tank heater running all the time. At 6a/hr, I only really get a drawdown after the sun doesn't send enough juice to the solar panels, so maybe 14 hrs which is 84 ah to recover, which is more than acceptable given my battery reserves. While we're away apart from the heater, there's the residential fridge and usual parasitic draws, so the system keeps up without breaking a sweat.

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