12 volt inverter with no alarm or a cut off

[madmilitia]

Hey guys been looking all over the net for a cheap inveter that doesnt have an alarm. My system is 2 deep cycle marine batterirs and 150 watts of panels. Currently i have a cheap 750 watt inverter from walmart. I soul porpise of my solar is to run a 250 watt heat lamp for about 8 hours. Problem is my inverter when the batteries get low sounds the lob alarm and keeps beeping.

Well my greenhouse is outside of coutse and i don't care the batteries are low cause tgey will recharge. How ever the inverter just keep buzzing even when the batteries charge back up

So 2 questions any one know of a cheap like 90 dollar 1000 watt inverter with no alarm

And what would it take to run 250 watt bulb for 9 hours. I have 550 amp hours worth of battery but every morning the lob alarm is going when i check the charge controller my batteries are 3/4 charged. Its a 12 v system

Thanks guys keep in mind this system is for a greenhouse so its diy on the cheap

[Sunking]

250 watts x 9 hours = 2250 watt hours per day.

Depending on where you live and I would guess north of I-40 because you need heat in a green house your daily Sun Hours this time of year are around 3 Sun Hours. If you are using a MPPT Charge Controller which you are not would take a panel wattage of 1125 watts and a good 40amp MPPT Charge Controller. If you use a PWM controller panel wattage required is 1500 watts and a 40 amp controller. You only have 150 watts right? To generate 2250 watt hours with a 150 wat panel would require a place that receives 22.5 Sun Hours in a day. Only a couple of places on planet earth around the equator can get up to 7 or 8 Sun Hours. You need almost 10 times the panel wattage to run your load and a lot more battery. That is why your Inverter is screaming at you.

Second problem is anything over 1000 watt panels requires a 24 volt battery system and the battery would need to be 24 volts @ 500 AH, you only have half that capacity with batteries that have been abused from over discharging and near death.

Sorry dude, we can't help you. You don't have anything to work with.

[madmilitia]

250 watts x 9 hours = 2250 watt hours per day.

Depending on where you live and I would guess north of I-40 because you need heat in a green house your daily Sun Hours this time of year are around 3 Sun Hours. If you are using a MPPT Charge Controller which you are not would take a panel wattage of 1125 watts and a good 40amp MPPT Charge Controller. If you use a PWM controller panel wattage required is 1500 watts and a 40 amp controller. You only have 150 watts right? To generate 2250 watt hours with a 150 wat panel would require a place that receives 22.5 Sun Hours in a day. Only a couple of places on planet earth around the equator can get up to 7 or 8 Sun Hours. You need almost 10 times the panel wattage to run your load and a lot more battery. That is why your Inverter is screaming at you.

Second problem is anything over 1000 watt panels requires a 24 volt battery system and the battery would need to be 24 volts @ 500 AH, you only have half that capacity with batteries that have been abused from over discharging and near death.

Sorry dude, we can't help you. You don't have anything to work with.

Hell yes i was hoping this was an elitest forums, well i live in colorado spings and my current setup gets me 6 hours of use so your math must ne flawed, 250 watt bulb runs 21 amps an hour, i was wrong on my batteries though i only have 244 amp hours. But by 9 am my bank is back to 3/4 full.

Regaurdless is there anyone here that kn I ws of a cheap 12 v 750 - 1000 watt invertrr that doesnt have an alarm.

[Sunking]

Hell yes i was hoping this was an elitest forums, well i live in colorado spings and my current setup gets me 6 hours of use so your math must ne flawed, 250 watt bulb runs 21 amps an hour, i was wrong on my batteries though i only have 244 amp hours. But by 9 am my bank is back to 3/4 full.

Regaurdless is there anyone here that kn I ws of a cheap 12 v 750 - 1000 watt invertrr that doesnt have an alarm.

OK you live in Colorado spring. This time of year depending on you panel tilt angle you can get up to 5 Sun Hours. That does not change things much for you. 2250 watt hours with PWM requires a 900 watt panel, or with MPPT 600 watts. It does mean you can use a 12 volt battery, but the battery needs to be 12 volt 900 AH.

No one is going to be able to tell you an inverter without an alarm because any worth having all have a built in Low Voltage Cut Off and alarm to prevent you from destroying the battery. The problem is not the inverter, the problem is you do not have near large enough panel wattage, charge controller, and battery. Until you fix that no one can help you. If you fix that problem, your inverter will work just fine.

Botom line is a 150 watt panel with a PWM controller at this time of year can only generate 350 watt hours in a day. You are demanding 2250 watt hours in a day. That is a deficit of 1900 watt hours. In addition your battery being 12 volt @ 244 AH only has a capacity of 2928 Watt hours. You are running a 21 amp load or C/11 discharge current and that takes the usable capacity down to 2500 AH. You are destroying your battery even if you could fully recharge it every day

Tell you what, you don't like my answer. Fine with me, I don't care what you think. Go to this forum and see what they say or wait for others here to reply. They are going to tell you the same thing. When you find out you are wrong, you do not even have to apologize to me.

[russ]

mad - You should pay attention.

[madmilitia]

OK you live in Colorado spring. This time of year depending on you panel tilt angle you can get up to 5 Sun Hours. That does not change things much for you. 2250 watt hours with PWM requires a 900 watt panel, or with MPPT 600 watts. It does mean you can use a 12 volt battery, but the battery needs to be 12 volt 900 AH.

No one is going to be able to tell you an inverter without an alarm because any worth having all have a built in Low Voltage Cut Off and alarm to prevent you from destroying the battery. The problem is not the inverter, the problem is you do not have near large enough panel wattage, charge controller, and battery. Until you fix that no one can help you. If you fix that problem, your inverter will work just fine.

Botom line is a 150 watt panel with a PWM controller at this time of year can only generate 350 watt hours in a day. You are demanding 2250 watt hours in a day. That is a deficit of 1900 watt hours. In addition your battery being 12 volt @ 244 AH only has a capacity of 2928 Watt hours. You are running a 21 amp load or C/11 discharge current and that takes the usable capacity down to 2500 AH. You are destroying your battery even if you could fully recharge it every day

Tell you what, you don't like my answer. Fine with me, I don't care what you think. Go to this forum and see what they say or wait for others here to reply. They are going to tell you the same thing. When you find out you are wrong, you do not even have to apologize to me.

dude i'm listening to you i am and trust me i know that what i have is not enough for what i want, i thank you for telling me how many panels and the wattage i need, how ever really all i wanted was to to know if there is an inverter out there that doesn't have an alarm. because what i'm trying to get around right now is the fact that my alarm goes off and then NEVER stops. i understand that it is going off because it should be.

so what your telling me is they don't make a power inverter without an alarm correct?

[Mike90250]

....
so what your telling me is they don't make a power inverter without an alarm correct?

Pretty much. Perhaps the Morningstar Suresine 300 does not have one. I think I remember reading it will re-connect when the batteries are above the minimum voltage. Look it up, read it's manual.

http://www.morningstarcorp.com/products/suresine/

[morgandc]

As it is a cheap inverter.....
find the whole with the beep coming out of it and deal with the beep. Poking a hole in the speaker with a non conducting item might solve the issue. Filling the hole with something like glue may/may not solve the issue. Opening the cover would void the warranty and if you don't have electronics experience isn't recommended, but cutting the wires to the speaker fixes this issue quite nicely.

Although your experiment is fun, the crowd is right in letting you know that you won't get much heat out of the system the way it is designed, and it will kill your batteries.

[madmilitia]

Pretty much. Perhaps the Morningstar Suresine 300 does not have one. I think I remember reading it will re-connect when the batteries are above the minimum voltage. Look it up, read it's manual.
http://www.morningstarcorp.com/products/suresine/

thank you for this i will look into it. does LOB shutdown stop the inverter from all power?

Although your experiment is fun, the crowd is right in letting you know that you won't get much heat out of the system the way it is designed, and it will kill your batteries.

i apperciate this, but you all need to put up a warning that this forum is for fully professional systems only and DIY fun questions are not taken well. i know this sounds like ultra ass4ole "but i didn't ask if it would fail or if it would produce much heat" << sorry for that i'm not tring to be an a$$.

i should have recived an answer like "well the cheapest way to this is add 15 100 watt panels 2 more 144 amp hour battieries and 4 more 30 amp charge controlers, this is the equipent you need to add to your current setup to get you to enoughpower and battiery, and as for inverter's with no alarm here is a list, or there are non or get one with LOB shut down"

but instead i got, "well your stupid cause you can't do that with your current setup you need blahhh blahh numbers and this and at 200,000 dollars more equipment, get out of here until you have something to work with.

now i'm laying the sarcasim on thick, but i'm an expert in the jeeping feild and on our forums we welcome everyone and we never say "you have nothing to work with", we've had guys convert VW bugs in off-road machines.

it's ok though i got a link to a differant forums where they were answering my questions so i'll just go hang out there, and leave you professionals along. thanks to those that helped. sorry to piss you off those that were rude.

[Mike90250]

thank you for this i will look into it. does LOB shutdown stop the inverter from all power?.........

It stops the inverting, but leaves the low power monitor running so that it can restart when the battery recovers.

5.1
Low Voltage Disconnect (LVD) – The SureSine will disconnect AC Output when the battery discharges below the LVD setpoint (after a four minute delay). AC Output will resume when the battery has recharged to Low Voltage Reconnect (LVR) setpoint. The LVD/LVR thresholds are adjustable using DIP switch 2. See the Installation, Step 2 section for details.
Audible LVD Warnings:
The SureSine will beep four (4) times when the battery discharges to the LVD Warning threshold voltage. The SureSine will beep twice when Low Voltage Disconnect

5.4
Over-current Protection – Full electronic protection against AC overloads.
Fully automatic reconnect after 10 seconds.
5.5
Short Circuit – Full protection against short circuits on AC Output. Three (3)
automatic retries every 10 seconds. If a short circuit still persists after three (3) retries, the fault must be manually cleared in one of the following ways:
1.
Turn the remote switch off, then on (or disconnect/reconnect jumper)
2.
Disconnect, then reconnect battery power.