And on a standby generator, if it is a true DC generator the brushes will last forever. But it is probably an alternator/rectifier. AC generator with redundant rectifiers is bound to be the best value.
From: Adam Moffett Sent: Friday, February 3, 2017 8:56 AM To: [email protected] Subject: Re: [AFMUG] I Want However you get there, the nice thing about DC is you don't have to stay at 3600 RPM. It's a big part of why inverter generators last so long on small loads. ------ Original Message ------ From: "Mark Radabaugh" <[email protected]> To: [email protected] Sent: 2/3/2017 10:29:29 AM Subject: Re: [AFMUG] I Want From an engineering standpoint I would expect a DC generator to be higher maintenance than an AC generator. True DC generators have brushes that wear while AC generators have very little other than bearings to wear out. Alternators (like your car has) are actually AC generators with a rectifier pack to turn the AC back into DC. When your alternator bites the dust about half the time it’s the rectifier that fails, the other half of the time it’s the bearings, with a small percentage of winding or other failures (yeah - I know that’s more than 100%). Our high reliability sites have standby AC generators with 500 gal propane tanks, a rectifier shelf, and ~24 hours of batteries. So far they have been very reliable. Mark On Feb 2, 2017, at 5:45 PM, Chuck McCown <[email protected]> wrote: Well, it certainly would protect you in the event of rectifier failure. From: That One Guy /sarcasm Sent: Thursday, February 02, 2017 3:44 PM To: [email protected] Subject: Re: [AFMUG] I Want if youre doing a standby generator at a dc site, even an AC fed DC site, wouldnt it be more efficient to use a dc generator, with less maintenance? On Thu, Feb 2, 2017 at 4:29 PM, Adam Moffett <[email protected]> wrote: Ah yes, I see. ------ Original Message ------ From: "Chuck McCown" <[email protected]> To: [email protected] Sent: 2/2/2017 5:28:39 PM Subject: Re: [AFMUG] I Want Perfect for off-grid solar backup. From: Adam Moffett Sent: Thursday, February 02, 2017 3:27 PM To: [email protected] Subject: Re: [AFMUG] I Want Man, sounds like a lot of money for 6kW. Variable speed must save a lot of gas though. ------ Original Message ------ From: "Chuck McCown" <[email protected]> To: [email protected] Sent: 2/2/2017 5:25:35 PM Subject: [AFMUG] I Want Have to come up with a reason but I want it: https://www.norwall.com/products/Kohler-6kW-Variable-Speed-Direct-Current-Generator-with-Oil-Make-Up-Kit-48-Volt-DC-6VSG?cid=google_feed&dfw_tracker=6374-6VSG-QS13&gclid=COWuo4-68tECFUdlfgodl8oG_A -- If you only see yourself as part of the team but you don't see your team as part of yourself you have already failed as part of the team.
