nanog mailing list archives
Re: Typical last mile battery runtime (protecting against power cuts)
From: William Herrin <bill () herrin us>
Date: Sun, 5 Feb 2023 01:12:36 -0800
On Sat, Feb 4, 2023 at 10:56 PM Roy <r.engehausen () gmail com> wrote:
On 2/5/23 07:02, Roy wrote:My all electric house is in a rural area. The generator that came with the place is a 20KW Onan, The bad news is in can't handle the house. I think it is the Aux Heat on the heat pump that is the problem. I have to also power the well pump and the septic pump.Single phase. The house is 200A service and the barn is another 200A service
Hi Roy, My guess is that your 20kw Onan isn't up to stably producing 20kw any more. Or perhaps the older transfer switch with its mechanical timer relays has gotten dodgy. The modern consumer gear is very reliable but the pre-2010s commercial/industrial gear (such as Onan) takes a lot of TLC to keep it working right. Another thing that can happen is uneven load. The utility won't care that 80% of your draw is on one side of the circuit but that'll stop a generator in its tracks. If you want to know for sure, get yourself an inductive clamp meter and start checking the amperages at the breakers. You can get a cheap one under 50 bucks. You just set it for AC amps, take the cover off your breaker panel and clamp the jaws around the "hot" wires coming from each breaker, one at a time. As John mentioned, unless you have a really large house or a tankless electric water heater, it's really odd to overwhelm a 20kw generator. Even with the auxiliary resistive heat. Regards, Bill Herrin -- For hire. https://bill.herrin.us/resume/
Current thread:
- Re: Typical last mile battery runtime (protecting against power cuts), (continued)
- Re: Typical last mile battery runtime (protecting against power cuts) Mark Tinka (Feb 04)
- Re: Typical last mile battery runtime (protecting against power cuts) Roy (Feb 04)
- Re: Typical last mile battery runtime (protecting against power cuts) Mark Tinka (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) Chris Adams (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) Mark Tinka (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) Saku Ytti (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) Roy (Feb 08)
- RE: Typical last mile battery runtime (protecting against power cuts) John van Oppen (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) Mark Tinka (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) Mark Tinka (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) William Herrin (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) Mark Tinka (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) Sabri Berisha (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) Mark Tinka (Feb 08)
- Re: Typical last mile battery runtime (protecting against power cuts) Sabri Berisha (Feb 04)
- Re: Typical last mile battery runtime (protecting against power cuts) Mark Tinka (Feb 04)