Search found 1523 matches

by Kent Osterberg
Thu Jan 30, 2020 7:32 am
Forum: FLEXmax Charge Controllers
Topic: Recommended PV Array Wattage
Replies: 9
Views: 3090

Re: Recommended PV Array Wattage

Do you have experience deploying these? Yes I do. And have installed more power than necessary to get rated output current. It makes more sense than a second controller when you need more charging in in winter when conditions with limited sun. Also, have found the built in Ethernet useful for monit...
by Kent Osterberg
Tue Jan 28, 2020 7:49 pm
Forum: FLEXmax Charge Controllers
Topic: Recommended PV Array Wattage
Replies: 9
Views: 3090

Re: Recommended PV Array Wattage

Bendesa1962, There are charge controllers, such as the Morningstar Tristar MPPT , that allow an excessively sized solar system. When you install an excessively large solar system, the maximum charging current is simply limited by the charge controller. In the case of a 60-amp controller charging at ...
by Kent Osterberg
Mon Jan 20, 2020 9:29 am
Forum: Off Grid Applications
Topic: Grounding Question
Replies: 22
Views: 5105

Re: Grounding Question

It is expensive, but you can pre-drill holes for the ground rods. A somewhat larger diameter is better than a tight fit. After inserting the ground rod it should be backfilled with ground enhancement material . The ground enhancement material is a mixture of carbon black and portland cement - lots o...
by Kent Osterberg
Mon Jan 20, 2020 8:43 am
Forum: Off Grid Applications
Topic: Grounding Question
Replies: 22
Views: 5105

Re: Grounding Question

pss, Sounds like you have exactly the case where you want a concrete encased electrode. 20 feet of 1/2" rebar encircled with at least 2" of concrete in the bottom of the building foundation. A second electrode is not required and no test to assure that the ground resistance is less than 25 ohms is r...
by Kent Osterberg
Sun Jan 19, 2020 4:32 pm
Forum: Off Grid Applications
Topic: Grounding Question
Replies: 22
Views: 5105

Re: Grounding Question

Mike,

The only time a single ground rod is sufficient is when it has been tested to show that it has a resistance less than 25 ohms. Since it cost less to install a second ground rod than to do the resistance test, the second ground rod is normally the option selected.
by Kent Osterberg
Sun Jan 19, 2020 4:29 pm
Forum: Off Grid Applications
Topic: Grounding Question
Replies: 22
Views: 5105

Re: Grounding Question

Raysun, If the inverter is bypassed with the breakers in a Flexware panel, the neutral/ground connection will remain unchanged in the bypass position. If the bypass is being done with a temporary external connection, then a temporary neutral/ground connection may be needed too. I've long wondered wh...
by Kent Osterberg
Sun Jan 19, 2020 9:29 am
Forum: Off Grid Applications
Topic: Grounding Question
Replies: 22
Views: 5105

Re: Grounding Question

If the cabin and inverter are in separate buildings both buildings must have grounding electrodes that are connected to the ground bus in the electrical panels. To best protect the inverter, neutral should be connected to ground at the inverter. Unless your state code allows the feeder circuit betwe...
by Kent Osterberg
Sun Dec 15, 2019 7:43 pm
Forum: OutBack
Topic: Charging questions
Replies: 4
Views: 2692

Re: Charging questions

If the generator is being controlled with a Mate, it would shut the generator off at the end of the absorb time. Float charging is not normally done with a generator.
by Kent Osterberg
Fri Dec 13, 2019 2:03 pm
Forum: OutBack
Topic: Charging US Battery L16HC
Replies: 6
Views: 2726

Re: Charging US Battery L16HC

Raysun, If increasing the absorption voltage and time corrects the problem, then maybe the extra modules aren't needed. But I suspect your assessment that more PV modules are needed is probably right. C/10 for these batteries would be about 42 amps; that a fair amount more than the 20 to 25 amps tha...
by Kent Osterberg
Fri Mar 29, 2019 3:40 pm
Forum: Off Grid Applications
Topic: High Specific Gravity, and what to do about it
Replies: 7
Views: 2993

Re: High Specific Gravity, and what to do about it

Jeff, I agree with the battery tech, the high specific gravity is almost certainly caused by overcharging. That's a lot better situation than undercharging. And the specific gravity you are observing is only slightly high. Don't lower the absorption setting by very much, maybe 0.1 or 0.2 volt. You d...
by Kent Osterberg
Sun Feb 10, 2019 1:47 pm
Forum: OutBack
Topic: Radians tripping GFDI ??? Help me understand
Replies: 11
Views: 4386

Re: Radians tripping GFDI ??? Help me understand

Changing the Mate3 settings shouldn't make any difference.
by Kent Osterberg
Sun Feb 10, 2019 11:41 am
Forum: OutBack
Topic: Radians tripping GFDI ??? Help me understand
Replies: 11
Views: 4386

Re: Radians tripping GFDI ??? Help me understand

I am, however, really curious as to how a setting in the system can cause a breaker to trip.
That doesn't seem right. Did you reconnect the ground in the DC enclosure?
by Kent Osterberg
Sat Feb 09, 2019 6:49 pm
Forum: OutBack
Topic: Radians tripping GFDI ??? Help me understand
Replies: 11
Views: 4386

Re: Radians tripping GFDI ??? Help me understand

It's not surprising that both GFDI's trip, the two sense circuits are parallel to each other- they both connect the DC- bus bar to ground in the GSLC. The sense circuit for the ac coupled PV array is isolated from the Outback GFDI in that the DC- of the ac coupled array is not connected to the GSLC,...
by Kent Osterberg
Sat Feb 09, 2019 9:54 am
Forum: OutBack
Topic: Radians tripping GFDI ??? Help me understand
Replies: 11
Views: 4386

Re: Radians tripping GFDI ??? Help me understand

Brett, The GFDI breakers are supposed to be the only connection between dc- and ground. Any current flowing from dc- to ground can trip the GFDI breakers; it doesn't have to be associated with a fault in the PV array at all. It doesn't even have to be a dc current. The problem you are having seems l...
by Kent Osterberg
Mon Jan 28, 2019 6:46 pm
Forum: Grid Tie Applications
Topic: FP1-VFXR3524 1 Hot Leg Output Sub Panel Elec Code?
Replies: 6
Views: 4550

Re: FP1-VFXR3524 1 Hot Leg Output Sub Panel Elec Code?

It is possible to wire up one of the old disk-type form 2S meters to read correctly when metering a 120-volt circuit . The form 2S is the kWh meter that is the most common. The meter will run forward when you are producing power and it will run backward when you are using power, so it will indicate ...
by Kent Osterberg
Mon Jan 28, 2019 12:17 pm
Forum: Grid Tie Applications
Topic: FP1-VFXR3524 1 Hot Leg Output Sub Panel Elec Code?
Replies: 6
Views: 4550

Re: FP1-VFXR3524 1 Hot Leg Output Sub Panel Elec Code?

Yoe, You should be able to wire everything pretty much as shown in the diagram and the electrical inspector should be happy with it. One thing not on the drawing that may be required by your utility company for net metering is a disconnect switch between the main ac panel and the inverter input term...
by Kent Osterberg
Fri Jan 11, 2019 4:21 pm
Forum: Grid Tie Applications
Topic: daily absorption time for backup batteries?
Replies: 9
Views: 5522

Re: daily absorption time for backup batteries?

It is very likely that the reason you are seeing the spread in the specific gravity values is that the battery electrolyte is stratified. A short absorption time on batteries that aren't discharged much will leave the batteries with lots of time just sitting. They need to bubble long enough to keep ...
by Kent Osterberg
Sun Jun 17, 2018 5:49 pm
Forum: Off Grid Applications
Topic: FNDC voltage
Replies: 2
Views: 1348

Re: FNDC voltage

If you are up to it, here is a post that shows where to make the adjustment:
http://www.outbackpower.com/forum/viewtopic.php?f=28&t=4372&start=38
by Kent Osterberg
Sun May 06, 2018 9:21 am
Forum: Off Grid Applications
Topic: Absorb question for lead acid batteries
Replies: 7
Views: 2852

Re: Absorb question for lead acid batteries

The item missing on Trojan's web site link that is included in their battery manuals is that charging should continue until the charging current drops to 1% to 3% of the battery capacity. Holding the absorb voltage for two hours is probably not long enough, that is especially true after the batterie...
by Kent Osterberg
Mon Apr 09, 2018 7:17 pm
Forum: RADIAN Series
Topic: Please does anyone know how to unclip this connector
Replies: 2
Views: 1950

Re: Please does anyone know how to unclip this connector

You insert a screw driver in the large rectangular slot and lift the handle outward. It is more difficult than you might expect. You can see it done on this YouTube video. https://www.youtube.com/watch?v=tMTTFck1-Zs
by Kent Osterberg
Tue Jan 30, 2018 4:26 pm
Forum: Off Grid Applications
Topic: Generator doesnt stop charging.
Replies: 6
Views: 2249

Re: Generator doesnt stop charging.

You can tell what device the Mate's AGS system is using to control the generator in the AGS setup (ADV/MATE/AGS/SETUP). 0 or 1 will be the aux port on the master inverter. It is possible to setup the FNDC to operate its relay independently of the MATE AGS. Confirm this hasn't been done by checking A...
by Kent Osterberg
Fri Jan 26, 2018 9:09 am
Forum: Off Grid Applications
Topic: Generator doesnt stop charging.
Replies: 6
Views: 2249

Re: Generator doesnt stop charging.

I recommend that the transfer delay be set between 3 and 6 cycles. A long delay, as you have experienced, will cause the lights and other devices to blink off for a moment. If the delay is too short, the inverter may disconnect from the generator unnecessarily and cause other problems. I suspect tha...
by Kent Osterberg
Tue Jan 23, 2018 10:59 am
Forum: Off Grid Applications
Topic: Generator doesnt stop charging.
Replies: 6
Views: 2249

Re: Generator doesnt stop charging.

It looks like you are using the oval Mate, is that right? You need to look at the AGS state. %SOC stop only works if the AGS start was because of %SOC start, 24 voltage start, or 2 hour voltage start. If the start reason was 2 min voltage start, then the system will charge until the FNDC's charge pa...
by Kent Osterberg
Fri Dec 01, 2017 3:01 pm
Forum: RADIAN Series
Topic: need dual battery cables if I only have 1 string?
Replies: 5
Views: 3414

Re: need dual battery cables if I only have 1 string?

Outback recommends the doubled 2/0 cable because it has lower resistance and inductance than single 4/0 cable. Four 2/0 cables will physically fit in 2" conduit within the allowed 40% fill, but passing the cable lugs through the 2" conduit will be a challenge. Unfortunately, four cables in conduit o...
by Kent Osterberg
Thu Nov 30, 2017 12:08 pm
Forum: OutBack
Topic: battery bank disconnect
Replies: 8
Views: 6307

Re: battery bank disconnect

The 2/0 battery interconnect cables are essentially in free air and have an ampacity of 225 amps for 60┬░C rated wire and 265 amps for 75┬░ rated wire, so it is perfectly safe to use single 2/0 cable for the interconnects. You just lose more energy than if you doubled them up. If the interconnects a...