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texman ![]() Senior Member ![]() ![]() Joined: 24 Jul 2014 Location: TeXas Online Status: Offline Posts: 446 |
![]() Posted: 12 Feb 2019 at 4:27pm |
thanks motor, i will check. it is off (i think) i really have no idea what it could be. it is total silence inside, which doesn't mean alot. all of the mods i made that are electrically related have a switch. the new meter i added is 4 ma. i wonder if i have the tv booster on. i plan to start pulling fuses i guess and hope that yields some results. but, once identified, that does not fix the problem of the drain on the battery.
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StephenH ![]() podders Helping podders - pHp ![]() ![]() Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6417 |
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Is by any chance the switch for the antenna booster turned on? That is a likely candidate for a higher current draw.
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StephenH
Happy is the man that findeth wisdom,... ouR escaPOD mods Former RPod 179 Current Cherokee Grey Wolf 24 JS |
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texman ![]() Senior Member ![]() ![]() Joined: 24 Jul 2014 Location: TeXas Online Status: Offline Posts: 446 |
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After clearing the Klein to start at zero, I consistently get .57-.59amp at all off. The meter I installed is close but I think I need to reset again. Pod is on battery so I will check in the morning again.
Thanks for all your help. |
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offgrid ![]() Senior Member ![]() Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
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0.59 sounds a lot better but still a little high, I'll check my "no load" current draw for comparison and post it.
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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texman ![]() Senior Member ![]() ![]() Joined: 24 Jul 2014 Location: TeXas Online Status: Offline Posts: 446 |
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i think i found it. After pulling all the fuses, even the 40 amp, i could read only minor changes from the 580 ma current at the battery. what else could it be? Some Clown ![]() ![]() been on for a year probably. don't have the exact specs, but amazon reviews say .6 amps when on and 30 ma when off. i dont see how it can draw when off. Do inverters draw current even when switched off? Since it had over/under voltage protection, i direct wired to the panel. You will most likely tell me that was a really bad idea. it has a built in switch, but i am thinking it needs to be switched or at least fused. I think that it must draw current even when off. i measured the current at the battery with the inverter disconnected from the board and my current was almost null. i reconnected the power, with the inverter off, and my current at the battery was 250ma. which is much better than the 580ma. Texman (starving Electrician)
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GlueGuy ![]() Senior Member ![]() ![]() Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2702 |
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bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
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texman ![]() Senior Member ![]() ![]() Joined: 24 Jul 2014 Location: TeXas Online Status: Offline Posts: 446 |
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should i add a circuit breaker to the inverter even though it has built in over/undervoltage protection? how many amps if so for the breaker? the inverter is 300w and 600watt peak. so 600w/12v=50 amp?
But I have 10 ga wire that is 2 ft long. That should be 30 amp. |
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GlueGuy ![]() Senior Member ![]() ![]() Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2702 |
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If you think you're going to run it at peak, you would need a 50 amp breaker. There are a couple of considerations. First, since that is a peak rating, you may want to fuse it lower at a sustainable level, so that you don't accidentally overload it with something that surges longer than it can handle. Second, DC circuit breakers are "special" in that they need to be much more robust than AC circuit breakers. This is because AC circuit breakers cross the zero-current boundary 120 times per second. DC circuit breakers have to break the circuit at full rated load, and need to be designed to not arc at that full load.
It might be simpler to use a fuse instead of a circuit breaker.
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bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
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offgrid ![]() Senior Member ![]() Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
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Many higher quality inverters do have a standby mode where they draw a few tens on mA to run the control board only, then turn onthe power section every say 10 seconds long enough to see if there is a load on the ac line. If there is they stay on, otherwise they shut down the power section off.
Yes you should have a fuse or circuit breaker on the inverter positive line if that is coming off the battery. It is there for the same reason you have cb’s in your panel, to protect the conductors from burning up from shorts and faults. So you size the wires and fuse or cb the same way the electric code would require you to do it for your ac household circuits. That is, you would size the conductors for the max rated inverter input current and then select the fuse or cb for that wire size. That max current should be in your inverter manual, if not it is going to around the inverter max output power rating divided by 12 divided by the inverter efficiency, which is usually around 80-90 percent, so around 60A for your inverter. That will be 4 awg wire. I know that sounds high but you’re dealing with a lot of current at only 12V. Many bigger inverters are run with 2/0 or 4/0. By doing it that way you won’t have nuisance cb trips or fuses blowing if you use the inverter at full load, and most importantly you won’t have circuits burning up. The cb or fuse should go as close to the battery positive terminal as you can so it protects the whole circuit from faults and shorts. |
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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texman ![]() Senior Member ![]() ![]() Joined: 24 Jul 2014 Location: TeXas Online Status: Offline Posts: 446 |
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the only thing we use it for is our air mattress which is 120vac, 0.9amp and 105 watts on the rating. I am getting a 30 amp inline fuse for the inverter and using 10 ga wire. the wire is only 2 feet long from inverter to the board connection. i will put the fuse in that 2 ft span. no hair dryers allowed.
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