[RE-wrenches] DR2424 inverters charging poorly: three units in two days!

Mick Abraham mick at abrahamsolar.com
Fri Aug 20 07:19:11 PDT 2010


Excellent responses, all...much appreciated. I think I can borrow a Honda-i
genset with inverter technology. I'll cart that out for a test run; that
should "illuminate" the situation.

Jolliness,

Mick Abraham, Proprietor
www.abrahamsolar.com

Voice: 970-731-4675


On Thu, Aug 19, 2010 at 11:57 PM, R Ray Walters <ray at solarray.com> wrote:

> Backwoods sells the buck boost transformers for a reasonable price.
> I have to add belatedly that as bomb proof as the venerable DRs were, they
> indeed never charged well from cruddy generators. I had one once that made
> 0.5 amps at 12 volts DC.
> The culprit as you already pointed out: Peak voltage was under 130 vac with
> the genie loaded. A Fluke 87/89 can be set to capture peak, and is very
> handy for diagnosing these DR/ genie ailments.
> I've had a couple of systems add grid later, and amazingly the DR will
> crank close to rated charging output when fed good pure sinewave.
> It was designed as backup power for ongrid in the Dominican Republic (DR),
> not genie power.
>
>  R. Walters
> ray at solarray.com
> Solar Engineer
>
>
>
>
> On Aug 19, 2010, at 7:29 PM, Allan Sindelar wrote:
>
>  Sure, Jay, but what does one of those puppies cost (I have never used
> one)? If the main reason for using a DR instead of a sine-wave inverter is
> lower cost, adding a transformer to improve charge rate kind of negates any
> argument for using one of these, doesn't it?
> Allan
>
>  On 8/19/2010 8:45 PM, jay peltz wrote:
>
> HI All,
>
>  If the voltage from the generators is low ( probably) then a old trick is
> to use a buck/boost transformer to bump it up the voltage.
> This trick has the advantage that it doesn't have the hz be too high.
>
>  yours,
>
>  jay
>
>  peltz power
>
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