Eco-Worthy-US via eBay has
Eco-Worthy 1920Wh 12V 150Ah LiFePO4 Lithium Battery w/ Bluetooth For RV Home on sale for $199.99 - $30 when you apply coupon code
THINGSYOULOVE at checkout =
$169.99.
Shipping is free.
Thanks to Staff Member
Skillful_Pickle for sharing this deal.
Features:
- Bluetooth 5.0 real-time monitoring lets you check battery voltage, current, capacity, and remaining life from your phone.
- Compact and lightweight: measures L13 × W6.9 × H8.5 inches, weighs only 34.61 lbs
- Low-temperature protection: charging is automatically cut off below -7°C (19.4°F) to prevent cell damage, ideal for winter and cold environments.
- Integrated 120A Battery Management System (BMS) protects against overcharge, over-discharge, overcurrent, short circuit, and temperature extremes.
- Supports 4S4P configuration, expandable from 1.92kWh up to 30.72kWh for custom battery systems; easy troubleshooting via mobile app.
- Suitable for RVs, cabins, off-grid, marine, camping, solar, and home energy storage-especially in cold climates.
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What wattage is your inverter rated for?
https://www.ebay.com/itm/126839185935
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With your conversions from Solar -> Bluetti -> 120V -> converter -> 12V FLA batteries you're losing a lot of juice along the way. Going directly from Solar to LFP batteries will be much more efficient, plus they charge much better/quicker than FLA batteries, assuming you have the panel wattage to feed them.
You do need a Solar Charge Controller (SCC) as you can't feed the panel output directly into the new batteries. I am using (for example) a Renogy version, there are many, Victron is supposed to be the top dog in that area, with the related un-slick cost.
As mentioned before, if your old FLA batteries are also charged by your alternator you will need to either interrupt that connection, or add a BIM or DC-DC charger to prevent burning up your alternator, unless you have a special high current version in your RV.
Here are some drawbacks to Lithium batteries... they may or may not apply to your situation.
1) They don't like temperature extremes. High temperatures will slowly eat into their potential life span. Charging them in freezing temperatures will kill them quickly. So, if you are regularly camping in cold places, they are best kept inside the camper where temperatures are more regulated.
2) They don't like to sit fully charged all the time. This doesn't mean you can't fully charge them, that is not a problem. But if the RV is say sitting for a couple of months at a time you don't want to keep them fully charged. Ideally around 50% SOC.
3) Likewise, discharging them to zero all the time (SOC, not voltage!) isn't great for them, although they are way better in that compared to FLA batteries which already huff when discharged below 50% SOC.
4) These batteries have a BMS which, under certain conditions, may trigger and turn off the battery. IF they are being charged by solar at that particular moment, the disappearing resistive load of the battery will cause the SCC to send a voltage spike along the lines which MAY fry connected equipment like refrigerators and such. This rarely happens, but its possible depending on what happens with the battery.
5) There are a couple more things that are fairly obvious, like you won't be able to start a car as this goes past the current capability of most Lithium batteries (however, you usually can charge the chassis battery if you have a BIM or such installed).
So why would anyone want to go through all of this and put a LFP battery into their camper? It comes down to energy density and charge/discharge characteristics. Basically, a LFP battery will weight roughly 1/3 of what a FLA battery of the same capacity weights. So if this battery here weights around 35lb, a comparable 150Ah FLA will weight closer to 100lb. Big deal for RV-ing. And, they charge more efficiently, and keep up their voltage over most of the discharge cycle. And, of course, you effectively get even more capacity as many recommend to not discharge FLA batteries past 50%, while these LFP ones can go easily to 20% or lower, almost doubling the effective output for the same capacity.
Hope some of this made sense.
Does it already have one inside? If not, why don't they put one inside, I'm assuming battery temperature is very important
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