inverter air con

[Kappy]

Hi Terry,

Does this look like a normal set apart from the cable size.

Will running a heavier cable from the studs on the Bin wall gonna be OK or is it better to run directly off the battery.

The circuit breaker located on the Binwall to the left of the other terminal is what trips,

As explained its a 70 amp circuit breaker type, by my calculations the toaster is drawing 69.3 amps, so after about 3 minutes its had enough.

Cheers

[BruceS]

It's just too close to the maximum I reckon.
Unfortunately Terry is right up to his ears with work but I'm quite sure you'd be better off with at least a 100A one.
I'm also not sure how your current batteries are going to cope with big loads. Eventually you will need to go to these new type batteries to allow normal household type appliances to be utilised.

[T1 Terry]

Forget about DC circuit breakers for inverter protection, they just can't take the high current and either melt the contacts together or melt the whole plastic box if they don't trip after a few mins. A 125 amp mega fuse will do the job fine, the cables from the batteries to the stud on the wall are both the same length? This is the very best design for linking big lead acid batteries together so at least that part is correct, the load will be shared across both batteries reasonably evenly so 2 x 4 gauge cable will supply the load the inverter requires, don't know how long it will keep it up though but 35 amps from each battery isn't that bad.

T1 Terry

[Kappy]

Thanks Terry,

I'm a little shaky about "Don't know how long it will keep it up"

Don't quite understand 35 amps from each battery, isn't the load coming coming from the 4 batteries?

Cheers
Kappy

[T1 Terry]

When you join 2 x 12v batteries together in series they become one 24v battery, so as far as I can tell you have 2 x 24v batteries in parallel connected by 4 gauge cable to the stub on the wall.... or have I got that bit wrong as well?

[Newcastle George]

Another photo of the complete battery and inverter system might help.

George

[Kappy]

As far as I can work out I have 4 12 volt 100ah AGM batteries connected to make 24 Volt.

Attached are 2 further pic

Pic No1 shows 6 gauge positive cable going to inverter from 70 amp curcit breaker and 6 gauge cable from terminal to inverter.

DSC_0050_1 (640x360).jpg

Pic No 2 shows as best as I can the complete set up.

DSC_0049_1 (640x360).jpg

I understand the need for heavier cable to the inverter, do I attache heavier cable + and - to terminals on Firewall with a new super fuse in line on the positive cable.

[T1 Terry]

As far as I can work out I have 4 12 volt 100ah AGM batteries connected to make 24 Volt.

Attached are 2 further pic

Pic No1 shows 6 gauge positive cable going to inverter from 70 amp curcit breaker and 6 gauge cable from terminal to inverter.

DSC_0050_1 (640x360).jpg

Pic No 2 shows as best as I can the complete set up.

DSC_0049_1 (640x360).jpg

I understand the need for heavier cable to the inverter, do I attache heavier cable + and - to terminals on Firewall with a new super fuse in line on the positive cable.

That is the correct method, the first photo shows the cable goes from the positive stud to the controller, then to the 70 amp circuit breaker and then the inverter positive is connected to the other end of the circuit breaker along with another cable that I guess is the lights etc. The positive cable to the inverter is still being powered through the controller, I don't know how the smoke hasn't come out of that yet as the load side is not designed to handle big amps like that. I'd suggest you remove the inverter cable from the circuit breaker as soon as possible to avoid killing the controller and circuit breaker if the inverter was accidently turned on again before the new cables and fuse as fitted.

T1 Terry

[Kappy]

As far as I can work out I have 4 12 volt 100ah AGM batteries connected to make 24 Volt.

Attached are 2 further pic

Pic No1 shows 6 gauge positive cable going to inverter from 70 amp curcit breaker and 6 gauge cable from terminal to inverter.

DSC_0050_1 (640x360).jpg

Pic No 2 shows as best as I can the complete set up.

DSC_0049_1 (640x360).jpg

I understand the need for heavier cable to the inverter, do I attache heavier cable + and - to terminals on Firewall with a new super fuse in line on the positive cable.

That is the correct method, the first photo shows the cable goes from the positive stud to the controller, then to the 70 amp circuit breaker and then the inverter positive is connected to the other end of the circuit breaker along with another cable that I guess is the lights etc. The positive cable to the inverter is still being powered through the controller, I don't know how the smoke hasn't come out of that yet as the load side is not designed to handle big amps like that. I'd suggest you remove the inverter cable from the circuit breaker as soon as possible to avoid killing the controller and circuit breaker if the inverter was accidently turned on again before the new cables and fuse as fitted.

T1 Terry

Done
Thanks

[Kappy]

Just an update on my invertor issues.

Finally got my new HD cable 0 gauge together with a new separate in-line 150amp fuse.

I have constructed new frame to house the invertor in a more accessible location and to act also as battery tie downs.

Its just sitting loosly ATM as I just wanted to wire up to see how everything function with the adjustments.

All wired up powered up invertor all seemed OK, plugged in my 1450 watt toaster and seemed to be drawing 2.9 amps with the voltage at 24.7 volts.

DSC_0120 (360x640).jpg

DSC_0121 (640x360).jpg

DSC_0122_2 (640x360).jpg

Toaster ran non stop for 20 minutes and no apparent issues and no tripping out or shut downs.also running house 24 volt stuff.

Later I ran a Delonghi portable A/c and all seemed good.

Now maybe time to tidy everything up and finish some other projects like my invertor A/C.