Author Topic: NASA bm-1 question  (Read 1371 times)

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Offline mike007

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NASA bm-1 question
« on: May 29, 2011, 09:22:25 AM »
Hi all,

Just deciding on the compact or the standard sized bm-1 and wanted to ask a quick question for the guys that have one of these units.

On the standard sized unit there is a A-Hr button which gives you total amps since reset from what I can see in the manual. I wanted to know if it shows you total amps in and total amps out since reset or is it just one net figure, ie if you put in 30 amps from your solar panel and used 20 amps in that time does the unit just show 10 amps charge or does it give you the 30 in and 20 out figure separately. Hope this makes sense.

The compact unit noes not have this function but I thought it might be handy to know this data to have an idea of what you are using during the night etc.

Cheers
Mike
« Last Edit: May 29, 2011, 09:47:05 AM by mike007 »

Offline RV Powerstream P/L

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Re: NASA bm-1 question
« Reply #1 on: May 29, 2011, 09:33:22 AM »
Mike
Talk to Brian Gatt at Electralogic he was talking to me about the Nasa monitor recently and he appears reasonably versed in them.
brian at electralogic.com.au

Offline sablesoft

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Re: NASA bm-1 question
« Reply #2 on: May 29, 2011, 10:53:05 AM »
Hi Mike007,

I had both BM1's, I bought the larger one first but it was to big for where I wanted to mount it. I then got the compact BM1 and I am very pleased with it, easy to monitor your battery status. I sold my large BM1 to another Myswager.

The compact BM1 only shows hours left at current rate of usage and current % of battery charge & Amps (Charge/Discharge) and volts,  no history options. When you install it you need to tell it how many AH the battery pack is.


I would recomend PRS Communications Ltd on Ebay to purchase a BM1, they refunded the VAT which then covered a good amount of the postage, Very good/fast service.
http://www.ebay.com.au/itm/NASA-Clipper-BM1-BATTERY-MONITOR-Instrument-12-VOLT-/370507703080?pt=UK_ConsumerElectronics_SpecialistRadioEquipment_SM&hash=item5643fae328

(The other UK ebay seller I got the large BM! from refused to refund the VAT

I am very happy with my BM1.

HTH Ray
Green Cub Escape Off Road

Offline mike007

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Re: NASA bm-1 question
« Reply #3 on: May 29, 2011, 08:43:14 PM »
Hi guys thanks for the responses.

Ray does the smaller unit give you time to full charge as well at time left at current discharge? I'm assuming that the functions are exactly the same as the larger unit with the history logging thing the only difference? Mate also in regards to The data logging did you get a chance to use it on your larger bm-1, just wandering about the Amps in/out being separate readings or is it a net figure?

Thanks for the eBay link as well. I will go with them. I'm thinking I'll go with the bigger unit as I have the space in the expanda to mount it, however the compact unit in your photo looks about the size of the light switch in your photo so the standard unit must be pretty big?

Thanks again guys.

Cheers
Mike
« Last Edit: May 29, 2011, 08:50:09 PM by mike007 »

Offline WogsRus

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Re: NASA bm-1 question
« Reply #4 on: May 30, 2011, 08:51:59 AM »
I Used Ebay PRS comms too, great company, excellent service and supper fast shipping. Highly recommended.

In regards to the unit, have not fully tested mine out yet, but i believe it just adds and subtracts the totals.
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Offline sablesoft

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Re: NASA bm-1 question
« Reply #5 on: May 30, 2011, 09:36:33 AM »
Hi guys thanks for the responses.

Ray does the smaller unit give you time to full charge as well at time left at current discharge? I'm assuming that the functions are exactly the same as the larger unit with the history logging thing the only difference? Mate also in regards to The data logging did you get a chance to use it on your larger bm-1, just wandering about the Amps in/out being separate readings or is it a net figure?

Thanks for the eBay link as well. I will go with them. I'm thinking I'll go with the bigger unit as I have the space in the expanda to mount it, however the compact unit in your photo looks about the size of the light switch in your photo so the standard unit must be pretty big?

Thanks again guys.

Cheers
Mike

Hi mike007
Yes it will show the time to full charge. I did not use my large BM1.
The BM1 shunt  is between the Neg terminal and the rest of the 12V system and reads what goes In/Out of the battery, ie a net figure.

HTH
Ray
Green Cub Escape Off Road

Offline WogsRus

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Re: NASA bm-1 question
« Reply #6 on: May 30, 2011, 09:51:05 AM »
ALSO, you can use the orange wire to pick up the second battery voltage.
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NOW 50th Anniversary Simpson Edition Poootrol wit some fruit

"Speed doesn't kill. It's the sudden stop at the end"
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Offline Gatty

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Re: NASA bm-1 question
« Reply #7 on: May 30, 2011, 12:31:42 PM »
Hi Guys,
The BM1 and the BM1 Compact are very similar, they both tell you Gross metering like 99% of all battery monitors on the market, so if you have solar pumping in at 10 amps, your three way fridge on 12volt drawing 15 amps and lights drawing 2 amps your gross metering will be at a minus of 7 amps. the BM1 i believe is the easiest to wire and easiest to use on the market.  The only difference is the the BM1 has Amp hours consumed. they both display State of Charge, Amps, Volts and Time to go at current rate of discharge.

I am the distributor of the products in Australia, I have also sold all of the other brands and models available, finding the NASA Marine gauges to be easiest for use and installation as well as at a glance with out pressing buttons it shows you loads of information on your battery health.
I cannot match the price of overseas internet sellers, as I do have to pay, Duty, freight and make it worth my time and effort to make a few dollars but at the same time I warrant all products that are sold through the business into Australia.

Talk soon.
Gatty

Offline Paddington

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Re: NASA bm-1 question
« Reply #8 on: May 30, 2011, 12:38:48 PM »
Mike

I used the standard size BM-1 and have it setup between a Ranox 12v charger and an MPPT solar regulator. Your correct, it records net in/out on the battery. It is great for sensing what charge is going in when camped on solar.

I've attached a couple of pictures.

Cheers

Peter





« Last Edit: May 30, 2011, 12:40:40 PM by Paddington »

Offline shorties178

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Re: NASA bm-1 question
« Reply #9 on: May 30, 2011, 01:33:52 PM »
I also have one of these units & am very happy with the ease of use & easy installation. I looked at some of the more expensive options but was turned off by the small displays. This one has an easy to read display with backlight. I didn't use the supplied 5m remote display cable as my shunt is mounted immediately behind the display.

Offline mike007

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Re: NASA bm-1 question
« Reply #10 on: May 30, 2011, 03:36:05 PM »
Thanks everyone, fantastic info and also thanks for the pics.

In regards to the "net" figure I just wanted to confirm from you guys  the data logging function , ie if you have the unit on for 6 hours for eg and you get 30 amps into the battery but you use 10 does the data logging show you 10 amp charge or does it give you both separately so you can se what has gone in and also what has been used since zeroing the data logger.

I know the display does give you instantaneous amps as a charge or a discharge normally. Sorry for flogging this it's Just that I wanna understand what's goin on.

Much appreciate everyone's comments.

Cheers
Mike

Offline Paddington

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Re: NASA bm-1 question
« Reply #11 on: May 30, 2011, 03:59:48 PM »
Mike

You can download a PDF of the manual here:

http://www.nasamarine.com/proddetail.php?prod=BMN-1_Battery

See page 5 for operation details.

Peter

Offline mike007

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Re: NASA bm-1 question
« Reply #12 on: May 30, 2011, 04:41:52 PM »
Hi thanks for the link for the manual.. I see that it will give you the net charge or discharge since zeroing the logger.

Thanks for that. I'll go ahead and put an order in with the eBay stor you guys have recommended. I appreciate all you inputs fellas, many thanks.

Cheers
Mike

Offline NewcastleKnight

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Re: NASA bm-1 question
« Reply #13 on: May 31, 2011, 08:40:53 PM »
Can anyone tell me the dimensions of this type of battery monitor?

Offline mike007

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Re: NASA bm-1 question
« Reply #14 on: May 31, 2011, 10:38:54 PM »
The bm-1 compact is 124mm x 62mm x 23mm

The standard bm-1 is 110mm square.