elby brook
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if I have enough left over after buying the battery I'm going to get some better solar panels.
Cheapest drop in lithium iron phosphate battery.
- Thread starter elby brook
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Get a U1-12RT then. Its much smaller but you should be able to get one for about $250 shipped. Idk prices are jumping up lately though. If you cant find one under $300 just get the big boy (138ah) and dont worry about a BMS. Run everything off a cheap walmart inverter and that will shutdown at low voltage for you. Your charge controller will limit charge.
In my camper I only use like 25-30ah in winter and maybe 45ah in summer running 120v 16" fan and 120v dorm fridge, tv, phone, lights, mifi, etc.
In my camper I only use like 25-30ah in winter and maybe 45ah in summer running 120v 16" fan and 120v dorm fridge, tv, phone, lights, mifi, etc.
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elby brook
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They have an external BMS. Its $400.
elby brook
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YIKES!
The RT series have a functional BMS on board. They were used in medical carts of various kinds. The XP series are used in much larger packs, typically delivery trucks or other commercial vehicle applications. Those need the external BMS. Have to be careful, there are low and high voltage BMS versions. I've not seen a low voltage one for sale in a long time and that is the one you would most likely want unless your pack is over something like 100 volts(I forget the transition point between the small and large versions). They are not sold directly to the public new.
BMS is now $600 and out of stock. This is where you should buy your valence as well. They are $500 shipped and come with spec readout so you know what youre getting.
www.mullerindustriesusa.com
Battery Management System MIUSA-BMSLV
MIUSA-BMSLV Battery Management Systems are designed to enable multiple system implementation options and advanced command and control ability. MIUSA-BMSLV is compatible with U27-12XP battery modules Features - Monitoring, temperature, voltage, current, SOC status - MIUSA-BMSLV can manage...
www.mullerindustriesusa.com
CerealKiller
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Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
I have to say this NOW ! STOP & SLOW DOWN ! I see your getting excited and wanting to pull the trigger, DON'T ! You really need a careful and thought out Plan and then get suck into it as your going to build up your system over time as funds allow it. Without a plan and careful consideration you will end up spending good money after bad and from your opening post, you are not in a position of having "disposable cash" to toss around.
The Valence Batteries may sound good off the top and they are okay BUT your not gaining anything other than used batteries with a reduced lifespan that may or may not be good and have an unknown lifecycle remaining. Someone above mentioned the 280AH cells which you would need 4 to make a 12V pack, plus a BMS that comes out to $510 USD with S&H, Taxes & Duties plus BMS say $150... $660 all in for 12V/280AH compared Valence at 12V/120AH for $500 ? do the math.
You need to define what exactly you want to do, how much you are willing to budget (hopefully they come close) and then works towards collecting the bits & pieces to put it all together. Also something to keep in mind, and NOONE MENTIONS IT ! is BOS (Balance of System) which is breakers, fuses, wires, switches etc... that stuff adds up amazingly fast s add 25% ON TOP of your budget for such items, I would say say budget 30% to be on the safer side.
elby brook
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I wouldn't have anything to spend on this if it wasn't for the stimulus check. I want to get everything set up while I still have the money. My power needs aren't great. All I need a battery for is to power my LED lights my phone, a fan and a couple Bluetooth speakers. The 100 amp-hour battery should be plenty for my needs. Anything more than that I have a generator for. I'm looking for a dead simple 100 AH lithium iron phosphate with a built-in BMS. I now have 300 watts of solar cells to charge it with. Is there a way I can buy three of the 40 AH Valence RT batteries and wire them together so they equal 120 amp hours?
I wouldn't have anything to spend on this if it wasn't for the stimulus check. I want to get everything set up while I still have the money. My power needs aren't great. All I need a battery for is to power my LED lights my phone, a fan and a couple Bluetooth speakers. The 100 amp-hour battery should be plenty for my needs. Anything more than that I have a generator for. I'm looking for a dead simple 100 AH lithium iron phosphate with a built-in BMS. I now have 300 watts of solar cells to charge it with. Is there a way I can buy three of the 40 AH Valence RT batteries and wire them together so they equal 120 amp hours?
I wouldn't have anything to spend on this if it wasn't for the stimulus check. I want to get everything set up while I still have the money. My power needs aren't great. All I need a battery for is to power my LED lights my phone, a fan and a couple Bluetooth speakers. The 100 amp-hour battery should be plenty for my needs. Anything more than that I have a generator for. I'm looking for a dead simple 100 AH lithium iron phosphate with a built-in BMS. I now have 300 watts of solar cells to charge it with. Is there a way I can buy three of the 40 AH Valence RT batteries and wire them together so they equal 120 amp hours?
$360 shipped for 60Ah
60Ah Lithium Battery (LiFePO4) - Available Late April!
The best lithium battery for small boat and Kayak trolling motors. This battery will outperform all 50AH Lithium batteries on the market today at 12lbs 10oz with a true 55AH usable power! Best price in the USA with our direct to consumer pricing. Order one today and see what everyone is taking...
ampedoutdoors.com
I did not know harbor freight sold a MPPT solar controller , are you sure it is not a PWM?
Helo All -
you are reading my FIRST post.
single question in this post - and WILL should TEST THIS.
300AH for $650?
Seems like a good deal - bms included?
TEAR IT DOWN and see what the quality is... best deal I've seen so far at ALIEXPRESS.
( i know - they are a crap shoot - it's why will should test it!)
thanks will. great site.
https://www.aliexpress.com/item/400...888#3325#4_668#2846#8107#15_668#2717#7560#220
you are reading my FIRST post.
single question in this post - and WILL should TEST THIS.
300AH for $650?
Seems like a good deal - bms included?
TEAR IT DOWN and see what the quality is... best deal I've seen so far at ALIEXPRESS.
( i know - they are a crap shoot - it's why will should test it!)
thanks will. great site.
https://www.aliexpress.com/item/400...888#3325#4_668#2846#8107#15_668#2717#7560#220
Thanks for reply.
True, but with a 1,000 cycle life - and you keep the DOD to , say 75%,,, one could expect about 5 years? With prices coming down so much, it bridges the gap nicely to what the next gen batts will be...and not so touchy as the lifepo4...
my two cents. glad someone else saw that...
Regarding the Valence XP series batteries, it's my understanding they do have a built in BMS. The external BMS is used for configuring the batteries, monitoring cell voltages and so on. Please refer to this thread:
diysolarforum.com
I would not pay more than $400.00 for the XP battery. I see them advertised locally here in Dallas on Craigslist for that price from time to time and they can be found for a little less if you google for them.
I have two of the U1-12RT's hooked in parallel and have been happy with them. I paid around $275.00 for both ordered separately on Ebay. This was before Will posted his video review on them, I would not pay any more than $150.00 shipped for one of these and all of this is under the condition the seller is offering free returns. They are very robust batteries if you don't want to DIY if you can get them at the right price.
I thought about ordering Valence XP batteries for my next build but decided to start from scratch with new batteries. Considering prices these days for new LifePo4 battery cells I believe that's the best way to go. Buy the cells from aliexpress or Alibaba, wire up a decent balancer and then one will have a brand new battery pack for a great price.
Valence XP Super Thread
#1: I'll try and keep this organized. We're limited to 10,000 characters so this will be a multi part post. If you have an XP battery or a bunch of them this will be a good thread for information on how to treat them properly. We'll discuss what the Valence Brand U-BMS actually does and how to...
diysolarforum.com
I would not pay more than $400.00 for the XP battery. I see them advertised locally here in Dallas on Craigslist for that price from time to time and they can be found for a little less if you google for them.
I have two of the U1-12RT's hooked in parallel and have been happy with them. I paid around $275.00 for both ordered separately on Ebay. This was before Will posted his video review on them, I would not pay any more than $150.00 shipped for one of these and all of this is under the condition the seller is offering free returns. They are very robust batteries if you don't want to DIY if you can get them at the right price.
I thought about ordering Valence XP batteries for my next build but decided to start from scratch with new batteries. Considering prices these days for new LifePo4 battery cells I believe that's the best way to go. Buy the cells from aliexpress or Alibaba, wire up a decent balancer and then one will have a brand new battery pack for a great price.
I totally agree it's a good deal but personally I would not want to be the first one to buy one...lol. It would be awesome if Will would test these. We don't know the manufacturer of the cells, BMS, how it's configured with the BMS and so on. I was actually thinking about the 200ah LifePo4 one they sell but decided against it for the same reasons.
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