Horse Trailer Camper

[2004LB7]

Missed this whole thing...

More batteries and bigger inverter then you think you need is never a bad thing..

Exactly. I'm looking at a minimum of 70 kWh of batteries. Bit I might double that since I found a good deal on some batteries that might not last. They are selling fast so if I don't get them now it may never be available later. And if I find something else down the road they may end up being a different dimension, internal resistance, possibly different chemistry. So, may not be a good match for pare up with the existing batteries. Might be better to get all at one time

Only issue is I might be short on solar as I can't fit more on the trailer. Not a problem when mobile or boondocking. But when powering the house it might fall behind about 5 months of the year in the late fall to early spring. Thinking I can put up a few extra panels on my patio roof and a plug to the trailer to give it a boost when needed. That can be later if needed

 

[malibu795]

70kwh?!?! I haven't gone through the whole thread yet.. so IDK what your doing for battery bank.. that's ~24 D8 batteries, or SLA fork truck style battery

I'm looking as building a 16 12v battery bank and running 10kw of solar

 

[2004LB7]

I'm looking at some lithium batteries. Going to be a 16 series lithium iron phosphate or LFP. Each pack can be wired with 6x of these. So 16S6P. One pack is 70 kWh. May do two packs for a total of 140 kWh. More then even the largest battery option of any of the Teslas. Even the cyber truck

These weight close to 900 lbs each. But still much less then lead acid for the same kWh capacity

 

[malibu795]

That based on the 2V-100ah or similar style batteries?

 

[2004LB7]

That based on the 2V-100ah or similar style batteries?

Each cell is a nominal 3.2 volts and 228 aH. That's 729.6 wH per cell. X 16 in series = 11,673.6 wH. Then there are 6X of these modules for 70 kWh. Do this twice for 140 kWh

The voltage range will be 40V to 58.4 volts

 

[2004LB7]

Welp, pulled the trigger on the batteries. ???

 

[malibu795]

Each cell is a nominal 3.2 volts and 228 aH. That's 729.6 wH per cell. X 16 in series = 11,673.6 wH. Then there are 6X of these modules for 70 kWh. Do this twice for 140 kWh

The voltage range will be 40V to 58.4 volts

Forgot they made a bigger version.. seems few guys use them in off grid setups

Just saw they have ~300ah versions now

(Pack of 4) EVE MB31 Grade A Cells - 3.2V LiFePO4 314Ah Battery

Building a LiFePO4 bank? EVE MB31 Grade A 3.2V 314Ah prismatic cells (pack of 4) deliver long life and high safety. See specs, price & fast shipping—shop.

www.18650batterystore.com

 

[2004LB7]

Forgot they made a bigger version.. seems few guys use them in off grid setups

I got the half sized packs as they will be easier to move into place

 

[2004LB7]

Forgot they made a bigger version.. seems few guys use them in off grid setups

Just saw they have ~300ah versions now

(Pack of 4) EVE MB31 Grade A Cells - 3.2V LiFePO4 314Ah Battery

Building a LiFePO4 bank? EVE MB31 Grade A 3.2V 314Ah prismatic cells (pack of 4) deliver long life and high safety. See specs, price & fast shipping—shop.

www.18650batterystore.com

These packs use 280 AH cells. Purchasing them individually will almost always cost more then in a pack. These go for $31.25 per cell in this configuration. Not counting shipping and tax

 

[malibu795]

These packs use 280 AH cells. Purchasing them individually will almost always cost more then in a pack. These go for $31.25 per cell in this configuration. Not counting shipping and tax

Nice score

Also, if you don't where would one look for said packs? Looks like a back system for computers

 

[2004LB7]

Nice score

Also, if you don't where would one look for said packs? Looks like a back system for computers

There used in automotive applications. Seems like it's more commercial use vehicles. Delivery vans, Construction, busses, etc

 

[2004LB7]

Got the batteries moved up to the 2nd level in the trailer. These things are deceptively heavy. Almost 500 lbs each. Had to get a hand winch from harbor freight to get them up the ramps. But finished getting them all up today with no issues

But first getting them off my truck. Was sketchy but worked.

 

[2004LB7]

Opened one up to have a peek. Real pretty



With the busbars removed, it's really easy to break the packs down from 48 cells in series to 3 separate 16 cell modules for 48 volts. 1/3 the voltage but 3X the capacity


Too the connector panel guts out to make room for my equipment and wiring. I think I'll put the fuse blocks here. But still thinking about it

 

[2004LB7]

Also started on the mounting for the solar panels. Stainless rivet nuts, rubber bushings and grade 8 hardware





The panels on the end are going to stick out about 2 inches. So I made these longer


Half way done today. Hopefully finish them up tomorrow along with the entry glands for the panel wiring

 

[2004LB7]

Next on the list is getting the inside spray foam insulated. And another holding tank right behind the current one

 

[2004LB7]

Finished the panel mounts

 

[Cougar281]

Yikes... 1000# just in batteries right over the hitch?

I suspect you're going to have a LOT of weight on the rear axle, especially with the trailer having the wheels further back... You going to be pulling it with a Kenworth?

 

[2004LB7]

Yikes... 1000# just in batteries right over the hitch?

I suspect you're going to have a LOT of weight on the rear axle, especially with the trailer having the wheels further back... You going to be pulling it with a Kenworth?

Haha. No. My dually. I've already had 6k lbs in the bed already and it was only on the 1st overloads. My calculations show it should be roughly 4k lbs on the hitch and 7k lbs on the rear depending on if the holding tanks are full or not

 

[2004LB7]

Fresh water 250 gallon holding tank installed. Have to finish building up the wood frame sub floor/joists. Couldn't find the other photos on my phone. Had a few more in progress that disappeared???. So this is what you get ?

 

[jlawles2]

Do those batteries have liquid cooling? Don't think you will pull on them hard enough to need it, but might be worth hooking up the cooling loop just in case you ever pull on them hard with inverters powering something like AC or the house during a storm if needed.