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Watt Meter / Battery Gauge

$29.95 $22.00
(You save $7.95)
Calculated at checkout

Product Description

NOTE: 48v nominal version can only be used on our 48v batteries...can blow out if used on 52 volt batteries with voltage spikes

  • Accurate amp hour reading tells you how much is left in your battery
  • 0-150amps tells you how much juice your engine is sucking
  • Backlit LCD display
  • Load side is female the Source side is male
  • Comes with XT90 connectors attached
  • 48v version can handle a fully charged 48v pack (which reaches around 54), can also handle lower voltages
  • 52v version can handle a fully charged 52v pack (which reaches around 58 fully charged), can handle lower voltages
  • If you are not sure which one to get, get the higher voltage version


Finally an affordable way to keep track of amp hours...the most accurate way to know how much juice is left in your  ebike battery and the true capacity of your battery.

It has an xt90 female  connector on load side and a male connector on the source side.  Basically you can connect it anywhere in between your battery and controller by coming in between the positive and negative lead wires.  It also can be used with a charger to conveniently be able to tell how many amp hours are going into your battery when charging and how many amps is the charger putting out. 



1. Does this replace the dashboard display on my bike?



1. No, while it does offer many of the same readings it is focused on the battery parameters only. There is no speed indication or distance measuring for instance. 

Product Reviews

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  1. Luna cycles Watt meter

    Posted by Don Minogue, Stewartstown, Pa on Sep 15th 2016

    I'm not exactly sure what I was expecting when I purchased this meter. It does exactly what it was advertised to do, measure energy delivered. It seems well made and is very accurate. That being said, for my purpose, as a casual ebiker, it is an un-necessary add on. The biggest draw back is it's always on and consumes a minimal amount of juice as long as it's connected. It's hard to read in the direct sun, and cycles thru the info too fast for me to read. I would not discourage anyone else from purchasing, I just don't feel it's the best money ever spent.

  2. Nice Gauge

    Posted by David Lackman on Aug 7th 2016

    Very nice Gauge for the money, a little difficult to see in direct sunlight, so I'm going to make a plastic shadow box for mine. Straight forward no buttons or confusing menu's, happy I purchased this. Thanks Luna!


    Posted by Unknown on Jan 14th 2016

    Nice and compact, and very light weight. Just what I was looking for.

  4. Great value

    Posted by Wayne Bergman on Dec 31st 2015

    Works great

  5. Watt Meter

    Posted by Eric Burns on Nov 11th 2015

    The watt meter is a nice tool to have on my battery. I am able to monitor the charge on my battery while in transit. (my dash board power indicator is not accurate) The meter gives a lot of valuable information. But it will not save the information after it has been disconnected.
    Eric B

  6. find out what's in your battery

    Posted by Unknown on Sep 30th 2015

    Since the fat tire kit's dash does not recognize true fat tire size none of the information it displays is trustworthy. So if you want to know what's in your battery the watt meter is the answer. It gives much more info than I can ever use but has no off switch so you have to watch your battery drain in sloooow motion.. This is a truly wonderful toy.