<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Backwoods sells the buck boost transformers for a reasonable price.<div>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.</div><div>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.</div><div>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.</div><div>It was designed as backup power for ongrid in the Dominican Republic (DR), not genie power. </div><div><br></div><div><div>
<span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>R. Walters</div><div><a href="mailto:ray@solarray.com">ray@solarray.com</a></div><div>Solar Engineer</div><div><br class="khtml-block-placeholder"></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span>
</div>
<br><div><div>On Aug 19, 2010, at 7:29 PM, Allan Sindelar wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<div bgcolor="#ffffff" text="#000000">
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? <br>
Allan<br>
<br>
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</o:shapelayout></xml><![endif]-->On 8/19/2010 8:45 PM, jay peltz
wrote:</div>
<blockquote cite="mid:931F42D7-BF9B-4209-9D23-1C35E97EACC6@asis.com" type="cite">HI All,
<div><br>
</div>
<div>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.</div>
<div>This trick has the advantage that it doesn't have the hz be
too high.</div>
<div><br>
</div>
<div>yours,</div>
<div><br>
</div>
<div>jay</div>
<div><br>
</div>
<div>peltz power</div>
</blockquote>
</div>
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