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Re: Lithium house battery setup
Lothos #811017 February 19th 2024 8:24 pm
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That would get it partially there. The modules are 100.4v max with what would be 33v per pack. Just havent quite fleshed that part out yet. Solar is definately on my mind since it could charge in the day and potentially operate indefinately.

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Re: Lithium house battery setup
Lothos #811037 February 20th 2024 9:02 am
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I am planning a Thermal Reactor for my new van.

Re: Lithium house battery setup
MufflerMan Mike #811040 February 20th 2024 9:35 am
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Originally Posted by MufflerMan Mike
I am planning a Thermal Reactor for my new van.

Maybe a turbo encabulator? lol

I ran a 180 amp alternator on my old Ford. Under heavy load it pulled so hard on the drive belt I had to swap out the drive system to get enough "belt wrap" on the pulley to keep it from chewing em up every 6 months or so.....

Re: Lithium house battery setup
Lothos #811103 February 21st 2024 6:02 pm
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Re: Lithium house battery setup
Lothos #811148 February 22nd 2024 9:11 am
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Turbo ecabulator what a great training film.

Re: Lithium house battery setup
Lothos #812503 April 19th 2024 1:47 pm
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Good news everyone!

It works, and has quite the endurance. I have been out on the farm for a bit and only recently got back in town with *just* enough time to throw the system together for its inaugural run. I did a hastily thrown together plywood adapter for the airconditioner and got everything wired up in the alpha stage of testing.

The batteries and all 300 lbs of their mass are comfortably situated under the bed frame in the back. The big + and - blocks are the actual contacts that make connecting the system safe and easy, at least for the purposes of testing.
[Linked Image]


The chargers, as previously stated are constant current LED drivers. Open circuit voltage is around 120v as they are wired in series. I havent charged the batteries from depleted, but it is certainly not a quick process. I may revise that later, but for now they are function and seem to charge at about 2% per hour.
[Linked Image]

I forget who did it, but this is my 3am copy of the one that someone had in thier drivers door window.
[Linked Image]

While camping, the AC was running for ~ 15 hours total on a 3 night stay drawing 350-400 watts. I had another fan to just move air around that added 50 watts. On the second night, friend asked if he could use the power to run the speakers for an outdoor rave, I obliged and they went on for about 3 hours drawing upwards of 450 watts. The whole thing went off without a hitch.
[Linked Image]


For the not so great, the inverter we got is technically "1500 wattts" and is just barely enough to do the job. The voltage sag on the inverter was pretty drastic meaning that it has a pretty under sized boost converter circuit in it. When I say sag, open circuit was about 111v, with the AC running it would drop into into the high 90's. At the end of the weekend I vacuumed, the vacuum consumes around 1kw normally, and the inverter voltage dropped as low as 90V.

I have started looking for an inverter that is actually capable of doing more than suggesting its rated output. Still, the batteries started the weekend at 100.7v for the pack and 4.195v per cell, or ~99% charge. It finished the weekend at 90v and 3.75 respectively for ~65% charge. So we averaged out consumption to about 4kwh for the weekend. From the standpoint of my local power rates, this cost me 45 cents.

I consider this a resounding success as it didnt catch fire and I enjoyed my cold air, as did the odd friend who needed a reprieve from partying a bit too hard.

Last edited by Lothos; April 19th 2024 1:47 pm.
Re: Lithium house battery setup
Lothos #812510 April 19th 2024 8:25 pm
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Your biggest hang up is your pack voltage, 120V RMS has a peak voltage of about 165 for AC power. If you can configure your packs for a higher voltage your efficacy will go through the roof. At 90V your drawing way to much current than should be and your running the A/C for a longer period of time to do the same work. Try shooting for a voltage drop of 5% (115V), I wonder if a boost transformer would be good for you? You would get hit with a 30-40 pound weight penalty for a dry transformer but it may do the trick.

Re: Lithium house battery setup
Lothos #812513 April 19th 2024 10:25 pm
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Im not against the idea of a transformer, but Im more inclined to put that money towards an inverter that wasnt the cheapest one we could find. Friend has another one by the same company that actually starts making arcing noises when it gets towards its upper limit of 60vdc.The one in the van, I dont trust it as the terminals are thumb screws and there doesnt appear to be any actual protection on the output.
The AC was definately having to work harder than it should have to keep up. Friend has been playing with a second gen prius inverter that will take 100-150vdc and boost it to 600vac at 50kw, but that's overkill and they are only starting to really crack the code on those.

We have discussed taking the packs and putting them in series rather than parallel, but the expense of the control circuitry starts climbing fast once you get above 120vdc.

The packs are rated for continous 200 amp draw as they are actually designed to be used with the superfast HVDC electric car chargers.


Side note, we may actually look for one of the solar chargers with built in inverter, havent decided on that though. That may be a project for after the house here gets sold later this year.

Re: Lithium house battery setup
Lothos #812538 April 21st 2024 10:19 am
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Definitely beyond my pay grade. I just have to keep enough wood to keep my camp fire stoked in my cave grin

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