lithium batteries- drop in

Topic: lithium batteries- drop in (Read 3690 times) previous topic - next topic

Re: lithium batteries- drop in

Reply #25 – February 01, 2019, 01:47:06 pm

These guys are pretty long winded, but do a good job in explaining the difference in battery types and their advantages.
https://www.youtube.com/watch?v=PZ7HMRReZKY

Re: lithium batteries- drop in

Reply #26 – February 01, 2019, 03:31:27 pm

Mine finally made it.. Been down with surgery but A friend and my son are helping me.. Hope to get them installed tonight and finished tomorrow.. I had to pull the battery shelf out and retro it as these are a bit bigger than 3ea 8d batteries

Re: lithium batteries- drop in

Reply #27 – February 01, 2019, 04:17:41 pm

Says to store at 30-50% SOC. I leave our electric bikes stored at a similar SOC.

Re: lithium batteries- drop in

Reply #28 – February 01, 2019, 06:11:35 pm

what is considered storage? what period of time? 1 month 3 months?

Re: lithium batteries- drop in

Reply #29 – February 01, 2019, 07:21:52 pm

I am assuming whatever time that it is under no load and not charging. I run our bikes down then put them away,

They charge quickly. So overnight before a use? Then leave it down when stored?

Opposite from lead acid anything?

Half charged would still be a lot of amphours in your case especially with no voltage drop visible?

Re: lithium batteries- drop in

Reply #30 – February 01, 2019, 08:27:00 pm

Quote from: DavidS – February 01, 2019, 03:31:27 pm

Mine finally made it.. Been down with surgery but A friend and my son are helping me.. Hope to get them installed tonight and finished tomorrow.. I had to pull the battery shelf out and retro it as these are a bit bigger than 3ea 8d batteries

David, who's the manufacture of these lithiums? I notice the life cycles and was surprised it was that low. Am I missing something?
Their DOD is great as all lithiums are! Thanks in advance for your help with those questions.

Re: lithium batteries- drop in

Reply #31 – February 01, 2019, 09:00:53 pm

4pcs/lot 3.2V 400Ah lithium Ion Lifepo4 battery For Electric Car/ Bus /BMS/...

Another place says 2000 cycles but either way.. If I ran them down every day Id still have a great run

Re: lithium batteries- drop in

Reply #32 – February 02, 2019, 10:07:40 am

In removing the battery tray form the coach I had a piece of fiberglass the old batteries sat on.. when removed I found 2 holes through the floor and 2 holes in the ceiling of the compartment. Obviously for cooling... wondering if the upper holes come from the interior to help cool and heat the compartment? Never seen the holes before.. maybe someone added the fiberglass for the batteries to sit on after the fact and not OEM?

I will try and get a pic before we install the new batteries..

Re: lithium batteries- drop in

Reply #33 – February 02, 2019, 10:47:19 am

I was searching for the post comparing lifetime costs of the different batteries, and can't find it. Gel, AGM Lithium and wet.

Re: lithium batteries- drop in

Reply #34 – February 02, 2019, 11:04:09 am

Quote from: DavidS – February 02, 2019, 10:07:40 am

In removing the battery tray form the coach I had a piece of fiberglass the old batteries sat on.. when removed I found 2 holes through the floor and 2 holes in the ceiling of the compartment. Obviously for cooling... wondering if the upper holes come from the interior to help cool and heat the compartment? Never seen the holes before.. maybe someone added the fiberglass for the batteries to sit on after the fact and not OEM?

David, I have the same two holes over my batteries. They are attached to two 2 1/2 inch dryer vent type of tubing that runs over the tanks into the rear bulkhead. I image Foretravel put them there incase someone decided to put non sealed batteries in there. I will watch the temp of my lithiums, and if they seem to be getting too warm in the summer, will put a couple of muffin fans in them,, to suck in cooler air.

Re: lithium batteries- drop in

Reply #35 – February 02, 2019, 02:22:58 pm

Quote from: DavidS – February 01, 2019, 03:31:27 pm

Mine finally made it.. Been down with surgery but A friend and my son are helping me.. Hope to get them installed tonight and finished tomorrow.. I had to pull the battery shelf out and retro it as these are a bit bigger than 3ea 8d batteries

David,

That looks awesome. Would you mind posting the overall dimension of your built up battery? Also what do you plan to use for charging?

thanks
ken

Re: lithium batteries- drop in

Reply #36 – February 02, 2019, 02:30:39 pm

Quote from: kenhat – February 02, 2019, 02:22:58 pm

David,

That looks awesome. Would you mind posting the overall dimension of your built up battery? Also what do you plan to use for charging?

thanks
ken

I will get the measurements.. I have 1200w solar and victron 3000 inverter/ charger. installed one of these for the alternator

LiFePO4 Battery Isolation Manager - Battle Born Batteries

Everything is finally installed and charging.. will test in the next couple weeks

When my inverter blew up I planned on lithium so I built it to accommodate lithium from the get go. It is also set up for regular batteries or agm so it was a win win.

Batteries I bought are UL listed for those really worried about it..

Re: lithium batteries- drop in

Reply #37 – February 02, 2019, 03:01:32 pm

Quote from: DavidS – February 01, 2019, 09:00:53 pm

4pcs/lot 3.2V 400Ah lithium Ion Lifepo4 battery For Electric Car/ Bus /BMS/...

Another place says 2000 cycles but either way.. If I ran them down every day Id still have a great run

Thanks David!

Re: lithium batteries- drop in

Reply #38 – February 02, 2019, 03:27:25 pm

Says they can take a charge at 1C. Wow. Maybe a separate charger?

Re: lithium batteries- drop in

Reply #39 – February 02, 2019, 04:30:29 pm

Wow, that's 15KWH! That's an above-average amount of power, and fairly light weight. Will your BMS will be monitoring each cell?

I have cells just like these in my rig for the engine battery.

If you paid $1,800 x 3=$5,400, you paid too much. That said, you got new, 12 volt, maintenance-free batteries that will last 10+years and have many advantages. EV lithium batteries will soon be selling at $100/KWH, ($1,500 for your pack) since we are on the cusp of an EV revolution. This will be a great boon to RV'ers.

See: Nissan Leaf Battery G1 Module Lithium Ion 24 kWh 500 watt per module Lot of...

The Nissan is only suited for a 24 or 48 volt system. My house battery is 48 volts.

Re: lithium batteries- drop in

Reply #40 – February 02, 2019, 06:11:32 pm

Paid under $5k for the batteries. Find a cheaper solution within the Lifepo4 Chem for the amount of AH and I would like to see it.. With BMS.. I am all ears?

Re: lithium batteries- drop in

Reply #41 – February 02, 2019, 09:16:31 pm

The best explanation of cycle life.
lithium & solar power LiFePO4, FAQ: What is the real cycle life for lithium...

The above link is to clear up the 1,500 - 2,000 cycle comments.

Way to go DavidS, I believe you will have these for a long time as you have installed a more than just adequate system. At an estimate of 1500, 2000, 3000, or maybe 5000 you might be at 80% of your original ahs, incredible, well worth your investment.

I too am looking at doing something similar, so I will look forward to all your posts and comments and also others that have installed lifepo4 systems in their rv.

Re: lithium batteries- drop in

Reply #42 – February 03, 2019, 10:46:13 am

After install... Batteries were at 12.9v .. I waited around a couple minutes for everything to reboot and start up.. Charger kicked in and went to 13.1v ....

Went to breakfast as my son was hungry which is a rarity.. On checking the Victron app. Batteries went into bulk mode right away. Never seen it with the last set of lithium.. it was like it was wrestling them to get charged past the 12.8v nominal.. They were used and I have no starting reference with them but I think they were bad.. excited with these for sure..

Charge is set to bulk at 14.4v and float at 13.8v

Will add pics in a min. Son moved my cord.

Tight squeeze I must say.. 12ea pieces 33" wide 12" tall and 16" deep with the tray

Re: lithium batteries- drop in

Reply #43 – February 03, 2019, 11:15:44 am

Looks terrific. Nice installation. Hopefully, we have a few years left on our AGMs but a price drop will make this hard to beat. Had been looking at fork lift batteries with their 1/4" plates but bet yours is a lot lighter.

Pierce

Re: lithium batteries- drop in

Reply #44 – February 03, 2019, 11:24:42 am

Quote from: Pierce & Gaylie Stewart – February 03, 2019, 11:15:44 am

Looks terrific. Nice installation. Hopefully, we have a few years left on our AGMs but a price drop will make this hard to beat. Had been looking at fork lift batteries with their 1/4" plates but bet yours is a lot lighter.

Pierce

Approx 375lb of batteries and probably another 50lb or so for the tray and clamped side pieces so a little over 440lb approx...1200ah total..

Also I spent $4600.00 for these batteries..try and purchase 2000ah of agm and see what the total would be.. then the longevity of the lithium I think its a no brainer.. For me anyways

Re: lithium batteries- drop in

Reply #45 – February 03, 2019, 11:57:55 am

That's a lot lighter than fork lift batteries and 1200ah is huge. It is a no brainer if paying anywhere close to list. I was lucky as I picked up ours from a bankrupt company for almost nothing. How is lithium if you have a power failure in a storage facility and parasitic load flattens them?

Pierce

Re: lithium batteries- drop in

Reply #46 – February 03, 2019, 12:12:03 pm

Quote from: Pierce & Gaylie Stewart – February 03, 2019, 11:57:55 am

That's a lot lighter than fork lift batteries and 1200ah is huge. It is a no brainer if paying anywhere close to list. I was lucky as I picked up ours from a bankrupt company for almost nothing. How is lithium if you have a power failure in a storage facility and parasitic load flattens them?

Pierce

BMS protected.. it will shut itself off if voltage gets to low or charging gets to high. Full protections.

Re: lithium batteries- drop in

Reply #47 – February 05, 2019, 06:35:52 pm

I was not trying to rain on your parade. You have embarked on an exciting home-brew lithium learning experience.

A couple of notes:

1. How would you like to earn back 30% on all your costs?
Just put even one new solar panel on your rig and you can claim the batteries, wiring and BMS on your federal taxes.

2. I like your simple clamping mechanism. This will keep the cells from bulging.

3. It's good that you got new matched batteries. I bought my LiFePo4s at a discount, but they were not very well matched, which resulted on several cells being damaged. A relay driven by the BMS shorted and overcharged the battery bank. Long story.

4. Are all your cells monitored by the BMS? If not, they should be. I installed the Orion BMS Jr, which cuts off charging when even one cell reaches >3.6 volts or < 2.5 volts. It can monitor up to 16 cells.

5. I would recommend folks buy a full 48 volt used Nissan Leaf pack. See: RV House Battery Part 2: Reconfigure the Nissan Leaf Modules to 48 Volts -...
These packs have at least 18KWH left in them for about $3,200 per my above eBay link. However, since thay are used, you cannot claim the 30% tax credit if you are installing solar panels. I recommend 18KWH as a minimum because my 9KWH LiFePo4 pack quickly gets run down if I leave the inverter on while boondocking on a cloudy day.

Re: lithium batteries- drop in

Reply #48 – February 05, 2019, 06:39:09 pm

No Rain here.. I have used the Tax credit on the solar

All BMS protected .. So far so good..

Re: lithium batteries- drop in

Reply #49 – February 05, 2019, 06:48:36 pm

Supercaps, are THE up and Coming Tech, I have been following! This was 2 years ago, but once they get rolling, I might do this in maybe ALL my power needs, Home, and Motorhome! An Electric Foretravel, anyone?

https://www.youtube.com/watch?v=3K8JIC-ov_Y

BTW, I knew that Elon Musk was Primarily interested in this Tech, in his Grad Studies. He may apply his "Power Wall" in a Supercap Flavor some day.....we can only hope?

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