WEBVTT

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Hi folks Dave here. Today
I have on my workbench the

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WOT cycle 12 volts 300 amp hour mini
battery. Now just to be clear a watt cycle

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sent this battery to me for a review I
did not pay for it. It looks pretty large

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but for a 300 amp hour battery looks a
bit on the small side and indeed it is

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smaller than you would expect and that's
why they're calling it a mini battery

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So what I'm going to do is put this battery
through its paces I'm going to put it on my

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other workbench and I'm going to attach it to a dedicated charge controller and
solar panels and really put this battery through its paces and see what it can do

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The only way to determine if it really
has 300 ampires in it is to do a real

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test, a deep cycle. Now this type of battery
has its own integrated BMS and it's a

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virtually plug-and-play part of an off-electric grid solar power system. This
battery has over three kilowatt hours of storage in it. Let's take a look at the

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label. There's the model number. 3.8 kilowatt hours 3.84 kilowatt hours,
so you could say it has 3 to 3.5 kilowatt hours in it with a reserve

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Let's take a look at the watt cycle website.
They have a whole line of 12-volt batteries

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and as you can see the 12 Mini is their new product They also have various other sizes as well Now let take
a look at the 200 amp power battery You can see this is the 200 amp power version and it 21 by 8 by 8 inches

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This particular one is not listed as a mini
size. It has a 200 amp BMS but just note the size

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21 by 8.2 by 8.5 inches and 45.2 pounds. We go
to shop, 12 volt batteries and 300mperm Mini

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it says it's nearly 12 pounds lighter
than a 3-pack of 12-1-100 ampires

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42% smaller than a 3-pack of 12-volt-100-ampar batteries and I believe that because
I've had two of the watt cycle 12-volt-100-ampar batteries on my bench before

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anyway it's 15.12 by 7.64 by 10.4 inches
and 57.32 pounds. Now interestingly if we

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take the dimensions of the battery and
cube them you get a number like this one

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159 cubic inches if I take the 200 ampire battery and I have one third to it it would be 1,951 cubic
inches but this 300 ampere battery is 1,159 cubic inches so I'm just doing some rough numbers to see

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what is the size comparison it a little bit hard to do that when the batteries on the workbench to get an idea you can tell it small
but it hard to tell how much smaller Now I using their 200 ampire battery as a comparison because a 300 ampire battery you would think

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would be one-third bigger. So in this case, it's
not, because it's a mini-battery, it is a compact

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form factor. They've crammed more power into a
smaller box. Anyway, let's calculate the percentage

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based on a one-third bigger 200-ampar battery,
a non-mini size. And I'm coming up with about

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41% or something like that. Let's just
say 40%. So really, that's quite a lot of

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impressive and these are just rough numbers so clearly
there's more power storage in this battery this

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300 ampire mini but the size hasn't grown to what
i would expect it stayed rather small and i find

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that pretty interesting other interesting specifications
is that it uses automotive grade a lifepo

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four cells i don't tend to rip the battery open to
see what's in it i'm just going to test it from

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a customer standpoint either it works or it
doesn't 200 ampr bms ip 65 waterproof rating that's

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good anyway it is allowed to put them in four
series so that means 40 volt or up to 4 in

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parallel that's quite a beefy system now
here's an interesting size comparison they

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have the 300 ampire mini battery compared
to a 12 o 300 ampire AGM and other 12

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0300 ampire batteries and it amazing with especially with lead acid this type of battery would compare extremely favorably to lead acid AGM batteries AGM batteries are okay but
of course they can perform on the level of a lithium and phosphate battery And there a picture It looks like they have the aluminum encased cells that are in a vertical position

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able to be charged as long as it's above freezing, and
it can discharge down to minus 4 degrees Fahrenheit

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I would certainly try to keep my batteries warmer than that,
but some people do have to put their batteries outdoors

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and so you have to be careful if you're going to have the battery in a cold location. Now they're claiming a
10-year lifespan, and that's not a problem with lithium iron phosphate, as long as you take very good care of them

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Here they say 15,000 cycles or more,
and that's 60% depth of this chart

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If you don't run it flat dead every single
cycle, you could certainly expect 15,000 cycles

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I agree that that's very reasonable expectation. You might
even get more, but that all depends on how you treat them

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Okay, that concludes this quick look at watt cycles specifications on their website. Let's take
a look at the bench test and go ahead and finish that up and see how this battery performs

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Alright, I got the battery moved over to
the other workbench. It was quite an effort

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It's pretty heavy, but you would expect for 300 ms
powers that there'd be significant weight increase

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And I'm going to wire in a charge controller
that's available, patch in my solar panels

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and give this thing a complete full charge.
Then it will bring over one of my inverters

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It's the same as that one right there. And I will charge this battery up,
run that inverter, and do a complete deep cycle test to see what it can do