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🆘 Relay specifically tripping inverter!!! 🆘
bigjoncoop:
@BrokenYugo @NiHaoMike @tom66 @edpalmer42 @KaneTW @Circlotron @Someone
Hey guys, thanks for all your replies!!!
I have some more details and things that I've tried.
So unfortunately I have tried a couple different relays and today I tried 2 different Solid State Relays and still they all trip the inverter when the compressor kicks on!
I've also tried using a light switch as someone suggested to see if that helps and it made no difference. Soon as turn on the switch the inverted trips.
I know someone asked if it was a portable or window unit, the unit I'm dealing with is a portable unit on wheels. As I mentioned it's brand new.
I made a video yesterday if anyone would like to watch it quick. I tried to cover all the details. The video does not include me testing the solid state relays because I did not receive them until today from Amazon. I purchased two SSR's , one is controlled by DC and one is controlled by AC. But as I mentioned they also tripped the inverter.
https://youtu.be/shoD-iH4Plo
***
So unless someone may have an idea besides purchasing a new AC unit or a larger inverter, I'm just going to have to bypass the main board and just hardwire both fans and the compressor.
I'm thinking I'll install a contactor between the battery and the inverter and use relays connected to the float switches in order to cut the unit off, and most importantly wire up the high and low pressure switches...
NiHaoMike:
--- Quote from: BrokenYugo on July 26, 2023, 02:07:14 pm ---If by portable you mean the roll around type, keep in mind those are considerably less efficient than the window type, especially if it only has one hose (1 hose blowing out keeps room/building at neg pressure, constantly sucking in hot wet air from outside the room). That's why you don't see portables under 8000btu.
--- End quote ---
Mod it to a 2 hose type, it will work a lot better.
--- Quote from: bigjoncoop on July 27, 2023, 02:52:52 am ---So unless someone may have an idea besides purchasing a new AC unit or a larger inverter, I'm just going to have to bypass the main board and just hardwire both fans and the compressor.
I'm thinking I'll install a contactor between the battery and the inverter and use relays connected to the float switches in order to cut the unit off, and most importantly wire up the high and low pressure switches...
--- End quote ---
How about modding the inverter to have a remote enable input (or if it already has one, use it) and connect it to the compressor relay? Then power the control logic from DC.
bdunham7:
--- Quote from: bigjoncoop on July 24, 2023, 07:33:24 pm ---I've tried using NTC inrush current limiters, as well as making a resistive inrush current limiter with a on time delay circuit and I had some varying success...
--- End quote ---
This should work if you set it up right and an NTC (or multiples) seems like the easiest solution to me. How much current does your AC draw when running, immediately after startup? And what is the maximum output of your inverter? (Model and datasheet would be nice too....)
AVGresponding:
--- Quote from: BrokenYugo on July 26, 2023, 02:07:14 pm ---Is the inverter well supplied? Heavy cables and battery up to the job? Sound like it's just a marginal combination.
If by portable you mean the roll around type, keep in mind those are considerably less efficient than the window type, especially if it only has one hose (1 hose blowing out keeps room/building at neg pressure, constantly sucking in hot wet air from outside the room). That's why you don't see portables under 8000btu.
At the high end it seems a lot of this stuff is starting to go to variable speed compressors that soft start themselves, that may be another option.
--- End quote ---
Should be reasonably easy to check this, with a DMM looking at the DCV at the inverter supply terminals. If the DCV drops by anywhere near to 20%, there's a good chance the inverter would shut off.
bigjoncoop:
--- Quote from: bdunham7 on July 27, 2023, 04:46:03 am ---This should work if you set it up right and an NTC (or multiples) seems like the easiest solution to me. How much current does your AC draw when running, immediately after startup? And what is the maximum output of your inverter? (Model and datasheet would be nice too....)
--- End quote ---
I've tried using Ametherm SL32 NTC thermistors. I've tried 1 and 2 in series with each other. I've tried this on the factory setup just connected to the compressor after the relay. Also when using a different relay and when tring both SSR's... Makes no difference.
Inverter Specs:
WZRELB 1500w / 3000w burst
SEE ATTACHED IMAGE
--- Quote from: BrokenYugo on July 26, 2023, 02:07:14 pm ---Is the inverter well supplied? Heavy cables and battery up to the job? Sound like it's just a marginal combination.
If by portable you mean the roll around type, keep in mind those are considerably less efficient than the window type, especially if it only has one hose
--- End quote ---
Yes the inverter is VERY well supplied. (Building custom lithium batteries is my specialty 😁) It consists of Qty 256- ANR26650M1B cells in a 4s64p Configuration. Each cell is capable of 50A continuous output! So the battery is 12v almost 2.5kWh and capable of pushing 3,200 amps continuously. I currently only have it setup with fuses to push a maximum of 800amps. I also bypassed the BMS so that wasn't a limiting factor.
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