2 for $5.00 each or $10 total.
http://www.harborfreight.com/7-function-multimeter-98025.html
--- In electricboats@yahoogroups.com, oak <oak_box@...> wrote:
>
> I'm using the Torqeedo, and it has a very nice panel on the throttle box. Displays both battery voltage and wattage.
>
> HOWEVER...  since it's just a motor, it obviously doesn't tell you anything about charging current for the system, which is a shame.
> The one really big gripe I would have about the display is that it isn't backlit. At night - you can't see a thing.
>
> I bought a clamp on meter at Harbor Freight, but all they had was AC. I didn't think anyone made a DC clamp on. Looking at Amazon, I see several that have decent reviews. So this may be the next new toy...  :)
>
> For my small, humble charger, it sounds like it would be MUCH more cost effective to just buy two $10 volt/amp meters and hook them up to the system. I know the $200 battery monitor systems would be much better, but that just seems like overkill for a 2 amp charger.
>
>
>
> ________________________________
> From: Arby bernt <arbybernt@...>
> To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
> Sent: Friday, October 26, 2012 5:58 PM
> Subject: Re: [Electric Boats] Re: Lead battery charging
>
>
> Â
> Dear Matthew,
> No e-boater should be without a clamp-on amp meter. Make sure you get one with a DC range, as most measure AC current only. No need to open connections that way, and you can use it in many other locations as well. Check eBay for DC Clamp Meters.
>
> Arby
>
>
> ________________________________
> From: Matthew Geier <matthew@...>
> To: electricboats@yahoogroups.com
> Sent: Friday, October 26, 2012 3:38 PM
> Subject: Re: [Electric Boats] Re: Lead battery charging
>
>
> Â
> On 27/10/12 02:20, oak wrote:
> > And even then, it's hard to tell whether the charger is putting out
> > any current or not. I guess I should be able to put an ammeter in
> > line with the charger and see what's going on.
> >
> Shouldn't you have an ammeter in the line anyway ? - knowing current
> draw when running is probably even more important. And the smarter 'BMS'
> systems measure current both ways and do calculations on charge state.
> My TBS battery meter does that.
>
> When I first connected it up, I had the sense wires to the shunt the
> wrong way around, so it was measuring discharge as charge and vis, so it
> wasn't giving me a run time figure. Took me a while to realise what i'd
> done wrong as the currents it was measuring were sensible, just the
> wrong direction....
>
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